微软C/C++："strict conformance"w.r.t的定义是什么。执行？
Microsoft C/C++: what is the definition of "strict conformance" w.r.t. implementation?
上下文：
/Za, /Ze (Disable Language Extensions):
... the C compiler conforms strictly to the C89/C90 standard
/permissive- (Standards conformance):
... and sets the /Zc compiler options for strict conformance
C++ Conformance improvements, behavior changes, and bug fixes in Visual Studio 2019:
... /permissive may be specified to turn off strict conformance mode in the compiler.
The second option is meant to disable the strict conformance mode ...
Note that this is not strictly conformant with ISO C99 ...
Walkthrough: Compile a C program on the command line:
MSVC is compatible with the ANSI C89 and ISO C99 standards, but not strictly conforming.
问：“严格符合”的定义是什么？是微软发明的吗？
注意：C (n2596.pdf) 和 C++ (n4849.pdf) 标准都没有使用术语“严格符合”/“严格符合”应用于实现。实现要么符合，要么不符合。 W/o 渐变。
更新。我的猜测：在“严格一致性”（w.r.t。到实施）下，微软的意思是“符合实施 w/o 支持任何扩展”。
C11 standard 在第 4 节第 5-7 段中定义了一个严格符合的程序和实现如下：
5 A strictly conforming program shall use only those features of the language and library specified in this
International Standard. It shall not produce output dependent
on any unspecified, undefined, or implementation-defined
behavior, and shall not exceed any minimum implementation limit.
6 The two forms of conforming implementation are hosted and freestanding. A conforming hosted implementation shall accept any
strictly conforming program. A conforming freestanding
implementation shall accept any strictly conforming program in
which the ∗ use of the features specified in the library clause
(clause 7) is confined to the contents of the standard headers
<float.h>, <iso646.h>, <limits.h>, <stdalign.h>, <stdarg.h>,
<stdbool.h>, <stddef.h>, <stdint.h>, and <stdnoreturn.h>. A
conforming implementation may have extensions (including
additional library functions), provided they do not alter the
behavior of any strictly conforming program.
7 A conforming program is one that is acceptable to a conforming implementation.
虽然术语严格符合实施和严格符合没有出现在这里，但它们可以理解为实施（在给定模式）将只接受严格符合的程序（或更准确地说，不支持标准中未指定的功能的实现）。
您感到困惑的一个关键部分是 /Za 和 /Ze 已被弃用并且很久没有更新了。它是为 ANSI 98 引入的，此后一直没有改变。不要使用这些开关，并忽略文档中对它们的任何引用。
现代 Visual C++“一致性”开关是 /permissive- 和各种 /Zc 开关，结合 /std.
当前“最符合”的选项是：
- C++20 是：
/std:c++20
- C++17 是：
/std:c++17 /permissive- /Zc:preprocessor.
- C++14 是：
/std:c++14 /permissive- /Zc:preprocessor.
- C11 是：
/std:c11
- C17 是：
/std:c17
https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/
Visual C++ 的部分一致性问题与预处理器有关
https://devblogs.microsoft.com/cppblog/c11-and-c17-standard-support-arriving-in-msvc/
有关逐个功能的细分，请参阅 Microsoft Docs
上下文：
/Za, /Ze (Disable Language Extensions):
... the C compiler conforms strictly to the C89/C90 standard
/permissive- (Standards conformance):
... and sets the /Zc compiler options for strict conformance
C++ Conformance improvements, behavior changes, and bug fixes in Visual Studio 2019:
... /permissive may be specified to turn off strict conformance mode in the compiler.
The second option is meant to disable the strict conformance mode ...
Note that this is not strictly conformant with ISO C99 ...
Walkthrough: Compile a C program on the command line:
MSVC is compatible with the ANSI C89 and ISO C99 standards, but not strictly conforming.
问：“严格符合”的定义是什么？是微软发明的吗？
注意：C (n2596.pdf) 和 C++ (n4849.pdf) 标准都没有使用术语“严格符合”/“严格符合”应用于实现。实现要么符合，要么不符合。 W/o 渐变。
更新。我的猜测：在“严格一致性”（w.r.t。到实施）下，微软的意思是“符合实施 w/o 支持任何扩展”。
C11 standard 在第 4 节第 5-7 段中定义了一个严格符合的程序和实现如下：
5 A strictly conforming program shall use only those features of the language and library specified in this International Standard. It shall not produce output dependent on any unspecified, undefined, or implementation-defined behavior, and shall not exceed any minimum implementation limit.
6 The two forms of conforming implementation are hosted and freestanding. A conforming hosted implementation shall accept any strictly conforming program. A conforming freestanding implementation shall accept any strictly conforming program in which the ∗ use of the features specified in the library clause (clause 7) is confined to the contents of the standard headers <float.h>, <iso646.h>, <limits.h>, <stdalign.h>, <stdarg.h>, <stdbool.h>, <stddef.h>, <stdint.h>, and <stdnoreturn.h>. A conforming implementation may have extensions (including additional library functions), provided they do not alter the behavior of any strictly conforming program.
7 A conforming program is one that is acceptable to a conforming implementation.
虽然术语严格符合实施和严格符合没有出现在这里，但它们可以理解为实施（在给定模式）将只接受严格符合的程序（或更准确地说，不支持标准中未指定的功能的实现）。
您感到困惑的一个关键部分是 /Za 和 /Ze 已被弃用并且很久没有更新了。它是为 ANSI 98 引入的，此后一直没有改变。不要使用这些开关，并忽略文档中对它们的任何引用。
现代 Visual C++“一致性”开关是 /permissive- 和各种 /Zc 开关，结合 /std.
当前“最符合”的选项是：
- C++20 是：
/std:c++20 - C++17 是：
/std:c++17 /permissive- /Zc:preprocessor. - C++14 是：
/std:c++14 /permissive- /Zc:preprocessor. - C11 是：
/std:c11 - C17 是：
/std:c17
https://devblogs.microsoft.com/cppblog/msvc-cpp20-and-the-std-cpp20-switch/
Visual C++ 的部分一致性问题与预处理器有关
https://devblogs.microsoft.com/cppblog/c11-and-c17-standard-support-arriving-in-msvc/
有关逐个功能的细分，请参阅 Microsoft Docs