Question

我正在创建一个m64 Autotools C ++项目。主程序汇编得很好。但是，我的一小部分代码需要编译一个32位的库（不会被我的主程序使用）。设置如下

lib_LTLIBRARIES = $(top_builddir)/lib/libabc.la

__top_builddir__lib_libabc_la_LDFLAGS = -version-info 1:0:0 -m32 


__top_builddir__lib_libabc_la_SOURCES = \
        abc.cc

AM_CXXFLAGS = -m32

endif

当我编译项目时，它会产生两种类型的错误。首先，即使我安装了gcc-multilib和g ++ - multilib，链接器也不会搜索32位库。我可以通过添加-L选项来让链接器搜索32位库来解决这个问题。但这种解决方案会损害可移植性。其次，Autotools添加了一些64位输入对象，例如crti.o，这会导致编译错误。完整的错误输出在这里

libtool: link: g++  -fPIC -DPIC -shared -nostdlib /usr/lib/gcc/x86_64-linux-
    gnu/4.8/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-
    gnu/4.8/crtbeginS.o  .libs/abc.o   -L/usr/lib/gcc/x86_64-linux-gnu/4.8 -
    L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu -
    L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib -L/lib/x86_64-linux-gnu -
    L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -
    L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. -lstdc++ -lm -lc -lgcc_s 
    /usr/lib/gcc/x86_64-linux-gnu/4.8/crtendS.o /usr/lib/gcc/x86_64-linux-
    gnu/4.8/../../../x86_64-linux-gnu/crtn.o  -m32 -msse2 -O0 -m32   -Wl,-soname -
    Wl,libabc.so.1 -o ../../lib/.libs/libabc.so.1.0.0
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.so when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/libstdc++.a when searching for -lstdc++
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libm.so when searching for -lm
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libm.a when searching for -lm
/usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libm.so when searching for -lm
/usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libm.a when searching for -lm
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libc.so when searching for -lc
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libc.a when searching for -lc
/usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libc.so when searching for -lc
/usr/bin/ld: skipping incompatible /usr/lib/x86_64-linux-gnu/libc.a when searching for -lc
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-linux-gnu/4.8/libgcc_s.so when searching for -lgcc_s
/usr/bin/ld: i386:x86-64 architecture of input file `/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crti.o' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file `/usr/lib/gcc/x86_64-linux-gnu/4.8/crtbeginS.o' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file `/usr/lib/gcc/x86_64-linux-gnu/4.8/crtendS.o' is incompatible with i386 output
/usr/bin/ld: i386:x86-64 architecture of input file `/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crtn.o' is incompatible with i386 output
collect2: error: ld returned 1 exit status

任何想法如何用适当的32位系统库编译这个32位库？

Answer 1

首先：我认为你需要设置CFLAGS而不是CXXFLAGS。

CFLAGS=-m32

它可能没什么，但你试过在其他人之前设置-m32标志吗？

第二：您是否尝试过使用pkg-config？您需要安装它并配置PKG_CONFIG_PATH

`pkg-config --libs lib32stdc++`

http://linux.die.net/man/1/pkg-config

对不起我的英语我正在学习

在m64 autotools项目中编译m32库

1 个答案: