XCode 9.3升级或替换libc++
XCode 9.3 upgrade or replace libc++
我在 C++ 中有以下代码，它在 GCC、MSVC2015、Android NDK、...
上运行得非常好
class JsonLongText {
private:
enum JsonToken {
JT_OBJECT,
JT_ARRAY,
JT_VARIABLE,
JT_EMPTY
};
typedef std::vector<JsonToken> JsonTokenStack;
JsonTokenStack m_OpenTokens;
....
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
}
我在 MacOS 10.13 和 XCode 9.2 的命令行上成功编译了它。但是在我的系统从 10.13 升级到 10.13.4 和 Xcode 到 9.3 版本之后。我面临以下错误：
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<JsonLongText::JsonToken *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<JsonLongText::JsonToken *, std::__1::allocator<JsonLongText::JsonToken> >::__compressed_pair<long, true>'
requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<JsonLongText::JsonToken, std::__1::allocator<JsonLongText::JsonToken> >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
../Include/JsonLongText.h:162:2: note: in instantiation of member function 'std::__1::vector<JsonLongText::JsonToken,
std::__1::allocator<JsonLongText::JsonToken> >::vector' requested here
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<JsonLongText::JsonToken *, 0,
false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<JsonLongText::JsonToken *, 0, false>'
for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<unsigned long *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<unsigned long *, std::__1::allocator<unsigned long> >::__compressed_pair<long, true>' requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<unsigned long, std::__1::allocator<unsigned long> >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
../Include/JsonLongText.h:162:2: note: in instantiation of member function 'std::__1::vector<unsigned long, std::__1::allocator<unsigned long> >::vector'
requested here
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<unsigned long *, 0, false>' for
1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<unsigned long *, 0, false>' for 1st
argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
我试图用另一个 Mac 中的文件替换整个目录 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1，其中 XCode 9.2。使用这些文件，我的项目构建成功完成。当前版本 XCode 中的 libc++ 似乎已损坏。
所以，可以降级 XCode 版本或升级 libc++ 吗？
编辑：
尝试使用正则表达式时会出现类似的错误。以下代码（从 cppreference 复制）：
// Simple regular expression matching
std::string fnames[] = {"foo.txt", "bar.txt", "baz.dat", "zoidberg"};
std::regex txt_regex("[a-z]+\.txt");
for (const auto &fname : fnames) {
std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n';
}
编译命令：
g++ -std=c++11 -DSTATIC_LIB -g -I . -I ../../../../openssl/iOS/include -o out/Expression.o -c Expression.cpp
原因：
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2051:9: error: cannot initialize a member subobject
of type 'std::__1::sub_match<const char *> *' with an rvalue of type 'long'
: __value_(_VSTD::forward<_Up>(__u)){};
^ ~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2151:9: note: in instantiation of function template
specialization 'std::__1::__compressed_pair_elem<std::__1::sub_match<const char *> *, 0, false>::__compressed_pair_elem<long, void>' requested here
: _Base1(std::forward<_U1>(__t1)), _Base2(std::forward<_U2>(__t2)) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:432:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::sub_match<const char *> *, std::__1::allocator<std::__1::sub_match<const char *> >
>::__compressed_pair<long, const std::__1::allocator<std::__1::sub_match<const char *> > &>' requested here
__end_cap_(nullptr, __a)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:485:11: note: in instantiation of member function
'std::__1::__vector_base<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::__vector_base' requested here
: __base(__a)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5355:7: note: in instantiation of member function
'std::__1::vector<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::vector' requested here
: __matches_(__a),
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2988:34: note: in instantiation of member function
'std::__1::match_results<const char *, std::__1::allocator<std::__1::sub_match<const char *> > >::match_results' requested here
match_results<const _CharT*> __m;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2051:9: error: cannot initialize a member subobject
of type 'std::__1::__state<char> *' with an rvalue of type 'long'
: __value_(_VSTD::forward<_Up>(__u)){};
^ ~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: note: in instantiation of function template
specialization 'std::__1::__compressed_pair_elem<std::__1::__state<char> *, 0, false>::__compressed_pair_elem<long, void>' requested here
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::__state<char> *, std::__1::allocator<std::__1::__state<char> > >::__compressed_pair<long, true>'
requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<std::__1::__state<char>, std::__1::allocator<std::__1::__state<char> > >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5536:21: note: in instantiation of member function
'std::__1::vector<std::__1::__state<char>, std::__1::allocator<std::__1::__state<char> > >::vector' requested here
vector<__state> __states;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2990:29: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<const char *>
> >' requested here
bool __matched = __exp_.__match_at_start_ecma(
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<std::__1::sub_match<const char *> *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::sub_match<const char *> *, std::__1::allocator<std::__1::sub_match<const char *> >
>::__compressed_pair<long, true>' requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:1326:5: note: in instantiation of member function
'std::__1::vector<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::vector' requested here
__state()
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5545:28: note: in instantiation of member function
'std::__1::__state<char>::__state' requested here
__states.push_back(__state());
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2990:29: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<const char *>
> >' requested here
bool __matched = __exp_.__match_at_start_ecma(
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<std::__1::sub_match<const char
*> *, 0, false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<std::__1::sub_match<const char *> *,
0, false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
我现在可以在我的机器上逐字重现您的 regex 错误。
诀窍是将 nullptr 重新定义为 0u 作为预处理器符号，然后再包含 vector 标准库 header（regex 取决于):
#define nullptr 0l
#include <regex>
#include <iostream>
int main ()
{
std::string fnames[] = {"foo.txt", "bar.txt", "baz.dat", "zoidberg"};
std::regex txt_regex("[a-z]+\.txt");
for (const auto &fname : fnames)
std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n';
}
鉴于上述情况，我现在认为您的问题是 header 预处理器名称空间污染的情况：一些 header，在您失败的翻译单元的包含链中的某处，可能定义了一个nullptr 这样的宏，这会导致 Xcode 9.3 附带的标准库的实现出错，但（我推测）由于某种原因，其他实现不会出错。
我建议使用 g++ -E 检查预处理器输出，并检查 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:432 处的违规代码，我认为错误最初是在此处触发的。
或者，您可以尝试始终在翻译单元中首先包含 vector。我怀疑这会让您在继续寻找根本原因的同时回避问题。
祝你好运！
刚刚遇到的问题，xcode12.4版本，仔细检查我的代码，发现有一个define: #define nullptr (NULL)。去掉这段代码，再次构建成功。
我在 C++ 中有以下代码，它在 GCC、MSVC2015、Android NDK、...
上运行得非常好class JsonLongText {
private:
enum JsonToken {
JT_OBJECT,
JT_ARRAY,
JT_VARIABLE,
JT_EMPTY
};
typedef std::vector<JsonToken> JsonTokenStack;
JsonTokenStack m_OpenTokens;
....
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
}
我在 MacOS 10.13 和 XCode 9.2 的命令行上成功编译了它。但是在我的系统从 10.13 升级到 10.13.4 和 Xcode 到 9.3 版本之后。我面临以下错误：
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<JsonLongText::JsonToken *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<JsonLongText::JsonToken *, std::__1::allocator<JsonLongText::JsonToken> >::__compressed_pair<long, true>'
requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<JsonLongText::JsonToken, std::__1::allocator<JsonLongText::JsonToken> >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
../Include/JsonLongText.h:162:2: note: in instantiation of member function 'std::__1::vector<JsonLongText::JsonToken,
std::__1::allocator<JsonLongText::JsonToken> >::vector' requested here
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<JsonLongText::JsonToken *, 0,
false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<JsonLongText::JsonToken *, 0, false>'
for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<unsigned long *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<unsigned long *, std::__1::allocator<unsigned long> >::__compressed_pair<long, true>' requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<unsigned long, std::__1::allocator<unsigned long> >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
../Include/JsonLongText.h:162:2: note: in instantiation of member function 'std::__1::vector<unsigned long, std::__1::allocator<unsigned long> >::vector'
requested here
JsonLongText() : m_IgnoreEmptyItems(true), m_RequireItemSeparator(false), m_PrettyPrint(false) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<unsigned long *, 0, false>' for
1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<unsigned long *, 0, false>' for 1st
argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
我试图用另一个 Mac 中的文件替换整个目录 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1，其中 XCode 9.2。使用这些文件，我的项目构建成功完成。当前版本 XCode 中的 libc++ 似乎已损坏。
所以，可以降级 XCode 版本或升级 libc++ 吗？
编辑： 尝试使用正则表达式时会出现类似的错误。以下代码（从 cppreference 复制）：
// Simple regular expression matching
std::string fnames[] = {"foo.txt", "bar.txt", "baz.dat", "zoidberg"};
std::regex txt_regex("[a-z]+\.txt");
for (const auto &fname : fnames) {
std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n';
}
编译命令：
g++ -std=c++11 -DSTATIC_LIB -g -I . -I ../../../../openssl/iOS/include -o out/Expression.o -c Expression.cpp
原因：
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2051:9: error: cannot initialize a member subobject
of type 'std::__1::sub_match<const char *> *' with an rvalue of type 'long'
: __value_(_VSTD::forward<_Up>(__u)){};
^ ~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2151:9: note: in instantiation of function template
specialization 'std::__1::__compressed_pair_elem<std::__1::sub_match<const char *> *, 0, false>::__compressed_pair_elem<long, void>' requested here
: _Base1(std::forward<_U1>(__t1)), _Base2(std::forward<_U2>(__t2)) {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:432:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::sub_match<const char *> *, std::__1::allocator<std::__1::sub_match<const char *> >
>::__compressed_pair<long, const std::__1::allocator<std::__1::sub_match<const char *> > &>' requested here
__end_cap_(nullptr, __a)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:485:11: note: in instantiation of member function
'std::__1::__vector_base<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::__vector_base' requested here
: __base(__a)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5355:7: note: in instantiation of member function
'std::__1::vector<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::vector' requested here
: __matches_(__a),
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2988:34: note: in instantiation of member function
'std::__1::match_results<const char *, std::__1::allocator<std::__1::sub_match<const char *> > >::match_results' requested here
match_results<const _CharT*> __m;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2051:9: error: cannot initialize a member subobject
of type 'std::__1::__state<char> *' with an rvalue of type 'long'
: __value_(_VSTD::forward<_Up>(__u)){};
^ ~~~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: note: in instantiation of function template
specialization 'std::__1::__compressed_pair_elem<std::__1::__state<char> *, 0, false>::__compressed_pair_elem<long, void>' requested here
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::__state<char> *, std::__1::allocator<std::__1::__state<char> > >::__compressed_pair<long, true>'
requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<std::__1::__state<char>, std::__1::allocator<std::__1::__state<char> > >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5536:21: note: in instantiation of member function
'std::__1::vector<std::__1::__state<char>, std::__1::allocator<std::__1::__state<char> > >::vector' requested here
vector<__state> __states;
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2990:29: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<const char *>
> >' requested here
bool __matched = __exp_.__match_at_start_ecma(
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
In file included from Expression.cpp:113:
In file included from ./StdAfx.h:23:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/algorithm:643:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2141:9: error: no matching constructor for
initialization of '__compressed_pair_elem<std::__1::sub_match<const char *> *, 0>'
: _Base1(std::forward<_Tp>(__t)), _Base2() {}
^ ~~~~~~~~~~~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:423:7: note: in instantiation of function template
specialization 'std::__1::__compressed_pair<std::__1::sub_match<const char *> *, std::__1::allocator<std::__1::sub_match<const char *> >
>::__compressed_pair<long, true>' requested here
__end_cap_(nullptr)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:473:5: note: in instantiation of member function
'std::__1::__vector_base<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::__vector_base' requested here
vector() _NOEXCEPT_(is_nothrow_default_constructible<allocator_type>::value)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:1326:5: note: in instantiation of member function
'std::__1::vector<std::__1::sub_match<const char *>, std::__1::allocator<std::__1::sub_match<const char *> > >::vector' requested here
__state()
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:5545:28: note: in instantiation of member function
'std::__1::__state<char>::__state' requested here
__states.push_back(__state());
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2990:29: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<const char *>
> >' requested here
bool __matched = __exp_.__match_at_start_ecma(
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2978:5: note: (skipping 4 contexts in backtrace; use
-ftemplate-backtrace-limit=0 to see all)
__lookahead(const basic_regex<_CharT, _Traits>& __exp, bool __invert, __node<_CharT>* __s, unsigned __mexp)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4098:35: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_term<const char *>' requested here
_ForwardIterator __temp = __parse_term(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:4074:31: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_alternative<const char *>' requested here
_ForwardIterator __temp = __parse_alternative(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:3026:19: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse_ecma_exp<const char *>' requested here
__first = __parse_ecma_exp(__first, __last);
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/regex:2522:10: note: in instantiation of function template
specialization 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::__parse<const char *>' requested here
{__parse(__p, __p + __traits_.length(__p));}
^
Expression.cpp:3356:16: note: in instantiation of member function 'std::__1::basic_regex<char, std::__1::regex_traits<char> >::basic_regex' requested here
std::regex txt_regex("[a-z]+\.txt");
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit copy constructor) not viable: no known conversion from 'long' to 'const std::__1::__compressed_pair_elem<std::__1::sub_match<const char
*> *, 0, false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2037:8: note: candidate constructor
(the implicit move constructor) not viable: no known conversion from 'long' to 'std::__1::__compressed_pair_elem<std::__1::sub_match<const char *> *,
0, false>' for 1st argument
struct __compressed_pair_elem {
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2050:3: note: candidate template ignored:
substitution failure [with _Up = long, = void]
__compressed_pair_elem(_Up&& __u)
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2055:3: note: candidate constructor template not
viable: requires 3 arguments, but 1 was provided
__compressed_pair_elem(piecewise_construct_t, tuple<_Args...> __args,
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/memory:2043:39: note: candidate constructor not viable:
requires 0 arguments, but 1 was provided
_LIBCPP_INLINE_VISIBILITY constexpr __compressed_pair_elem() : __value_() {}
我现在可以在我的机器上逐字重现您的 regex 错误。
诀窍是将 nullptr 重新定义为 0u 作为预处理器符号，然后再包含 vector 标准库 header（regex 取决于):
#define nullptr 0l
#include <regex>
#include <iostream>
int main ()
{
std::string fnames[] = {"foo.txt", "bar.txt", "baz.dat", "zoidberg"};
std::regex txt_regex("[a-z]+\.txt");
for (const auto &fname : fnames)
std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n';
}
鉴于上述情况，我现在认为您的问题是 header 预处理器名称空间污染的情况：一些 header，在您失败的翻译单元的包含链中的某处，可能定义了一个nullptr 这样的宏，这会导致 Xcode 9.3 附带的标准库的实现出错，但（我推测）由于某种原因，其他实现不会出错。
我建议使用 g++ -E 检查预处理器输出，并检查 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/vector:432 处的违规代码，我认为错误最初是在此处触发的。
或者，您可以尝试始终在翻译单元中首先包含 vector。我怀疑这会让您在继续寻找根本原因的同时回避问题。
祝你好运！
刚刚遇到的问题，xcode12.4版本，仔细检查我的代码，发现有一个define: #define nullptr (NULL)。去掉这段代码，再次构建成功。