c - "skipping incompatible"conftest错误

Question

我相信conftest缺少正确的标志，但我无法通过查看mkmf.log的内容来找出问题，这些内容包含在下面。 任何想法将不胜感激!

• 我正在编译用于 OpenWRT 路由器 (mips)
• 使用 ruby​​ 1.9.2 执行此测试，然后构建 Makefile
• The idn extconf.rb file in question
• A related question, which is why I'm using the referenced gem and not the rubyforge one

have_library: checking for main() in -lidn... -------------------- no<p></p>

<p>"i486-linux-gnu-gcc -o conftest -I /backfire/staging_dir/host/include/ruby-1.9.1/i486-linux -I /backfire/staging_dir/host/include/ruby-1.9.1/ruby/backward -I /backfire/staging_dir/host/include/ruby-1.9.1 -I. -O2 -I /backfire/staging_dir/host/include -D_FILE_OFFSET_BITS=64 -O2 -I /backfire/staging_dir/host/include -O2 -I /backfire/staging_dir/host/include conftest.c  -L. -L /backfire/staging_dir/host/lib -Wl,-R /backfire/staging_dir/host/lib -L.  -rdynamic -Wl,-export-dynamic     -Wl,-R -Wl, /backfire/staging_dir/host/lib -L /backfire/staging_dir/host/lib -lruby-static  -lpthread -lrt -ldl -lcrypt -lm   -lc"
checked program was:
/* begin <em>/
1: #include "ruby.h"
2: 
3: int main() {return 0;}
/</em> end */</p>

<p>"i486-linux-gnu-gcc -o conftest -I /backfire/staging_dir/host/include/ruby-1.9.1/i486-linux -I /backfire/staging_dir/host/include/ruby-1.9.1/ruby/backward -I /backfire/staging_dir/host/include/ruby-1.9.1 -I. -O2 -I /backfire/staging_dir/host/include -D_FILE_OFFSET_BITS=64 -O2 -I /backfire/staging_dir/host/include -O2 -I /backfire/staging_dir/host/include conftest.c  -L. -L /backfire/staging_dir/host/lib -Wl,-R /backfire/staging_dir/host/lib -L.  -rdynamic -Wl,-export-dynamic     -Wl,-R -Wl, /backfire/staging_dir/host/lib -L /backfire/staging_dir/host/lib -lruby-static -lidn  -lpthread -lrt -ldl -lcrypt -lm   -lc"
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.so when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.a when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.so when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.a when searching for -lidn
/usr/bin/ld: cannot find -lidn
collect2: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: /<em>top</em>/
4: int main() {return 0;}
5: int t() { void ((<em>volatile p)()); p = (void ((</em>)()))main; return 0; }
/* end */</p>

<p>"i486-linux-gnu-gcc -o conftest -I /backfire/staging_dir/host/include/ruby-1.9.1/i486-linux -I /backfire/staging_dir/host/include/ruby-1.9.1/ruby/backward -I /backfire/staging_dir/host/include/ruby-1.9.1 -I. -O2 -I /backfire/staging_dir/host/include -D_FILE_OFFSET_BITS=64 -O2 -I /backfire/staging_dir/host/include -O2 -I /backfire/staging_dir/host/include conftest.c  -L. -L /backfire/staging_dir/host/lib -Wl,-R /backfire/staging_dir/host/lib -L.  -rdynamic -Wl,-export-dynamic     -Wl,-R -Wl, /backfire/staging_dir/host/lib -L /backfire/staging_dir/host/lib -lruby-static -lidn  -lpthread -lrt -ldl -lcrypt -lm   -lc"
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.so when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.a when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.so when searching for -lidn
/usr/bin/ld: skipping incompatible  /backfire/staging_dir/host/lib/libidn.a when searching for -lidn
/usr/bin/ld: cannot find -lidn
collect2: ld returned 1 exit status
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: /<em>top</em>/
4: int main() {return 0;}
5: int t() { main(); return 0; }
/* end */
</p>

Answer 1

Ruby 的 mkmf.rb 使用 native 编译器来测试 libidn，但由于您的目标是 MIPS，因此需要使用交叉编译器。我假设 mkmf.log 中列出的 libidn.so 和 libidn.a 文件是为 MIPS 构建的。由于原生 i486 编译器需要 i486 库，因此遇到 MIPS 文件时会报告“skipping incomplete”错误。

我认为您需要修改 extconf.rb 文件以指向交叉编译器。像这样的东西:

require 'mkmf'

CONFIG['CC'] = '/path/to/mips-gcc'

此外，您可能需要将 mkmf.rb 指向 MIPS 的 Ruby 头文件。我不确定需要设置什么，但我猜至少应该覆盖 CONFIG['arch'] 和 CONFIG['archdir'] extconf.rb 文件。