如何为 RISC-V 交叉编译 elfutils？
How to cross-compile elfutils for RISC-V?
我想为 RISC-V 目标交叉编译 elfutils，但出现链接器错误，我不知道如何解决。我使用 riscv-gnu-toolchain.
建立zlib
elfutils 是针对 zlib 构建的，所以我需要先构建它：
CC=riscv64-unknown-linux-gnu-gcc ./configure --prefix=/usr/local/riscv64-unknown-linux-gnu
make
make install
我使用此前缀将所有 RV64 库放在同一位置，以便链接器可以轻松找到它们（也许是错误的？）。构建 zlib 似乎是成功的，没有错误，并且 libz.so.1 和其他相关文件被放入 /usr/local/riscv64-unknown-linux-gnu/lib.
建造elfutils
使用 RISC-V 主机执行配置脚本：（我还使用与 zlib 相同的 CC 和 PREFIX 交叉编译了 zstd、bzip2 和 xz）
$ ./configure --build=x86_64-linux-gnu --host=riscv64-unknown-linux-gnu --prefix=/usr/local/riscv64-unknown-linux-gnu --disable-libdebuginfod --disable-debuginfod
[checking a lot of stuff...]
=====================================================================
elfutils: 0.183 (eu_version: 183)
=====================================================================
Prefix : /usr/local/riscv64-unknown-linux-gnu
Program prefix ("eu-" recommended) : eu-
Source code location : .
Maintainer mode :
build arch : x86_64-pc-linux-gnu
RECOMMENDED FEATURES (should all be yes)
gzip support : yes
bzip2 support : no
lzma/xz support : yes
zstd support : yes
libstdc++ demangle support : yes
File textrel check : yes
Symbol versioning : yes
NOT RECOMMENDED FEATURES (should all be no)
Experimental thread safety : no
install elf.h : no
OTHER FEATURES
Deterministic archives by default : false
Native language support : yes
Extra Valgrind annotations : no
libdebuginfod client support : no
Debuginfod server support : no
Default DEBUGINFOD_URLS :
EXTRA TEST FEATURES (used with make check)
have bunzip2 installed (required) : yes
have zstd installed : no
debug branch prediction : no
gprof support : no
gcov support : no
run all tests under valgrind : no
gcc undefined behaviour sanitizer : no
use rpath in tests : no
test biarch : no
然后 运行 make 但是我得到这个错误：
$ make
make --no-print-directory all-recursive
Making all in config
make[2]: Nothing to be done for 'all'.
Making all in lib
CC xstrdup.o
CC xstrndup.o
CC xmalloc.o
[...]
CC disasm_str.os
CC symbolhash.os
AR libasm_pic.a
CCLD libasm.so
Making all in debuginfod
make[2]: Nothing to be done for 'all'.
Making all in src
CC readelf.o
CCLD readelf
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: libz.so.1, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: libzstd.so.1, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: liblzma.so.5, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_auto_decoder@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzclose'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflate'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_isError'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzdopen'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_freeDCtx'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflate'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflateInit_'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzread'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateEnd'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_createDCtx'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_end@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzerror'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_code@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflateEnd'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateInit_'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_decompressStream'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateReset'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzdirect@ZLIB_1.2.2.3'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:686: readelf] Error 1
make[1]: *** [Makefile:529: all-recursive] Error 1
make: *** [Makefile:445: all] Error 2
为什么链接器找不到 libz.so.1、libzstd.so.1 和 liblzma.so.5？您可以在此处看到这些库可用：
$ find /usr/local/riscv64-unknown-linux-gnu -name "libz.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/libz.so.1.2.11
/usr/local/riscv64-unknown-linux-gnu/lib/libz.so.1
$ find /usr/local/riscv64-unknown-linux-gnu -name "libzstd.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/libzstd.so.1
/usr/local/riscv64-unknown-linux-gnu/lib/libzstd.so.1.5.0
$ find /usr/local/riscv64-unknown-linux-gnu -name "liblzma.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/liblzma.so.5.2.5
/usr/local/riscv64-unknown-linux-gnu/lib/liblzma.so.5
我需要添加 LIBS="-lz -lzstd -llzma"。完整的配置命令如下所示：
LIBS="-lz -lzstd -llzma" ./configure --build=x86_64-linux-gnu --host=riscv64-unknown-linux-gnu --disable-libdebuginfod --disable-debuginfod --prefix=/usr/local/riscv64-unknown-linux-gnu
我预计，这些标志已经由配置脚本和 makefile 设置...但由于某些原因，如果库是动态链接的，则它们不是。
src/Makefile.am: (zip_LIBS= -lzstd -llzma)
[...]
if BUILD_STATIC
libasm = ../libasm/libasm.a
libdw = ../libdw/libdw.a -lz $(zip_LIBS) $(libelf) -ldl -lpthread
libelf = ../libelf/libelf.a -lz
else
libasm = ../libasm/libasm.so
libdw = ../libdw/libdw.so
libelf = ../libelf/libelf.so
endif
[...]
我想为 RISC-V 目标交叉编译 elfutils，但出现链接器错误，我不知道如何解决。我使用 riscv-gnu-toolchain.
建立zlib
elfutils 是针对 zlib 构建的，所以我需要先构建它：
CC=riscv64-unknown-linux-gnu-gcc ./configure --prefix=/usr/local/riscv64-unknown-linux-gnu
make
make install
我使用此前缀将所有 RV64 库放在同一位置，以便链接器可以轻松找到它们（也许是错误的？）。构建 zlib 似乎是成功的，没有错误，并且 libz.so.1 和其他相关文件被放入 /usr/local/riscv64-unknown-linux-gnu/lib.
建造elfutils
使用 RISC-V 主机执行配置脚本：（我还使用与 zlib 相同的 CC 和 PREFIX 交叉编译了 zstd、bzip2 和 xz）
$ ./configure --build=x86_64-linux-gnu --host=riscv64-unknown-linux-gnu --prefix=/usr/local/riscv64-unknown-linux-gnu --disable-libdebuginfod --disable-debuginfod
[checking a lot of stuff...]
=====================================================================
elfutils: 0.183 (eu_version: 183)
=====================================================================
Prefix : /usr/local/riscv64-unknown-linux-gnu
Program prefix ("eu-" recommended) : eu-
Source code location : .
Maintainer mode :
build arch : x86_64-pc-linux-gnu
RECOMMENDED FEATURES (should all be yes)
gzip support : yes
bzip2 support : no
lzma/xz support : yes
zstd support : yes
libstdc++ demangle support : yes
File textrel check : yes
Symbol versioning : yes
NOT RECOMMENDED FEATURES (should all be no)
Experimental thread safety : no
install elf.h : no
OTHER FEATURES
Deterministic archives by default : false
Native language support : yes
Extra Valgrind annotations : no
libdebuginfod client support : no
Debuginfod server support : no
Default DEBUGINFOD_URLS :
EXTRA TEST FEATURES (used with make check)
have bunzip2 installed (required) : yes
have zstd installed : no
debug branch prediction : no
gprof support : no
gcov support : no
run all tests under valgrind : no
gcc undefined behaviour sanitizer : no
use rpath in tests : no
test biarch : no
然后 运行 make 但是我得到这个错误：
$ make
make --no-print-directory all-recursive
Making all in config
make[2]: Nothing to be done for 'all'.
Making all in lib
CC xstrdup.o
CC xstrndup.o
CC xmalloc.o
[...]
CC disasm_str.os
CC symbolhash.os
AR libasm_pic.a
CCLD libasm.so
Making all in debuginfod
make[2]: Nothing to be done for 'all'.
Making all in src
CC readelf.o
CCLD readelf
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: libz.so.1, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: libzstd.so.1, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: warning: liblzma.so.5, needed by ../libdw/libdw.so, not found (try using -rpath or -rpath-link)
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_auto_decoder@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzclose'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflate'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_isError'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzdopen'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_freeDCtx'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflate'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflateInit_'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzread'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateEnd'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_createDCtx'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_end@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzerror'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `lzma_code@XZ_5.0'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `deflateEnd'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateInit_'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `ZSTD_decompressStream'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libelf/libelf.so: undefined reference to `inflateReset'
/usr/local/lib/gcc/riscv64-unknown-linux-gnu/10.2.0/../../../../riscv64-unknown-linux-gnu/bin/ld: ../libdw/libdw.so: undefined reference to `gzdirect@ZLIB_1.2.2.3'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:686: readelf] Error 1
make[1]: *** [Makefile:529: all-recursive] Error 1
make: *** [Makefile:445: all] Error 2
为什么链接器找不到 libz.so.1、libzstd.so.1 和 liblzma.so.5？您可以在此处看到这些库可用：
$ find /usr/local/riscv64-unknown-linux-gnu -name "libz.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/libz.so.1.2.11
/usr/local/riscv64-unknown-linux-gnu/lib/libz.so.1
$ find /usr/local/riscv64-unknown-linux-gnu -name "libzstd.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/libzstd.so.1
/usr/local/riscv64-unknown-linux-gnu/lib/libzstd.so.1.5.0
$ find /usr/local/riscv64-unknown-linux-gnu -name "liblzma.so.*"
/usr/local/riscv64-unknown-linux-gnu/lib/liblzma.so.5.2.5
/usr/local/riscv64-unknown-linux-gnu/lib/liblzma.so.5
我需要添加 LIBS="-lz -lzstd -llzma"。完整的配置命令如下所示：
LIBS="-lz -lzstd -llzma" ./configure --build=x86_64-linux-gnu --host=riscv64-unknown-linux-gnu --disable-libdebuginfod --disable-debuginfod --prefix=/usr/local/riscv64-unknown-linux-gnu
我预计，这些标志已经由配置脚本和 makefile 设置...但由于某些原因，如果库是动态链接的，则它们不是。
src/Makefile.am: (zip_LIBS= -lzstd -llzma)
[...]
if BUILD_STATIC
libasm = ../libasm/libasm.a
libdw = ../libdw/libdw.a -lz $(zip_LIBS) $(libelf) -ldl -lpthread
libelf = ../libelf/libelf.a -lz
else
libasm = ../libasm/libasm.so
libdw = ../libdw/libdw.so
libelf = ../libelf/libelf.so
endif
[...]