Linux 如何交叉编译RISC-V的elfutils？

我想交叉编译RISC-V目标的

elfutils

，我得到了链接器错误，我不知道如何解决。我用这个

构建

zlib

elfutils

是根据

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

我使用这个前缀将所有RV64库放在同一个位置，这样链接器就可以很容易地找到它们（可能是错的？）。构建

zlib

似乎是成功的，没有错误和

libz.so.1

和其他相关文件被放置到

/usr/local/riscv64 unknown linux gnu/lib

中

构建

elfutils

使用RISC-V主机执行配置脚本：（我还交叉编译了

zstd

、

bzip2

和

xz

，使用与

zlib

相同的CC和前缀）

然后运行

make

，但我得到以下错误：

$ 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：

$ 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，标志已经由配置脚本和makefiles设置。。。但由于某些原因，如果LIB是动态链接的，它们就不是

src/Makefile.am

：（

zip_LIBS=-lzstd-llzma

）

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

[...]
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
[...]