使用64位llvm-gcc构建32位 [英] Build 32-bit with 64-bit llvm-gcc
问题描述
我有llvm-gcc的64位版本,但我希望能够同时构建32位和64位二进制文件.是否有一个标志?我尝试传递-m32(可在常规gcc上使用),但收到如下错误消息:
I have a 64-bit version of llvm-gcc, but I want to be able to build both 32-bit and 64-bit binaries. Is there a flag for this? I tried passing -m32 (which works on the regular gcc), but I get an error message like this:
[jay@andesite]$ llvm-gcc -m32 test.c -o test
Warning: Generation of 64-bit code for a 32-bit processor requested.
Warning: 64-bit processors all have at least SSE2.
/tmp/cchzYo9t.s: Assembler messages:
/tmp/cchzYo9t.s:8: Error: bad register name `%rbp'
/tmp/cchzYo9t.s:9: Error: bad register name `%rsp'
...
这是倒退;我想为64位处理器生成32位代码!
This is backwards; I want to generate 32-bit code for a 64-bit processor!
我正在运行llvm-gcc 4.2,这是Ubuntu 9.04 x86-64随附的版本.
I'm running llvm-gcc 4.2, the one that comes with Ubuntu 9.04 x86-64.
编辑:这是当我使用-v标志运行llvm-gcc时输出的相关部分:
Here is the relevant part of the output when I run llvm-gcc with the -v flag:
[jay@andesite]$ llvm-gcc -v -m32 test.c -o test.bc
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../llvm-gcc4.2-2.2.source/configure --host=x86_64-linux-gnu --build=x86_64-linux-gnu --prefix=/usr/lib/llvm/gcc-4.2 --enable-languages=c,c++ --program-prefix=llvm- --enable-llvm=/usr/lib/llvm --enable-threads --disable-nls --disable-shared --disable-multilib --disable-bootstrap
Thread model: posix
gcc version 4.2.1 (Based on Apple Inc. build 5546) (LLVM build)
/usr/lib/llvm/gcc-4.2/libexec/gcc/x86_64-linux-gnu/4.2.1/cc1 -quiet -v -imultilib . test.c -quiet -dumpbase test.c -m32 -mtune=generic -auxbase test -version -o /tmp/ccw6TZY6.s
我查看了/usr/lib/llvm/gcc-4.2/libexec/gcc,希望找到另一个二进制文件,但是唯一的目录是x86_64-linux-gnu.接下来,我可能会看一下使用适当的选项从源代码编译llvm-gcc.
I looked in /usr/lib/llvm/gcc-4.2/libexec/gcc hoping to find another binary, but the only directory there is x86_64-linux-gnu. I will probably look at compiling llvm-gcc from source with appropriate options next.
推荐答案
尝试设置:
export CFLAGS="-m32"
export LDFLAGS="-m32"
在编译之前...
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