Yes gcc 4.9.0.
Thread model: win32
gcc version 4.9.0 (i686-win32-sjlj-rev0, Built by MinGW-W64 project)
2014-04-26
Best regards,
lh_mouse
发件人：TOCK Chiu <stanley82...@gmail.com>
发送时间：2014-04-26 21:20
主题：Re: [Mingw-w64-public] Do I need -flto when building a static lib?
收件人："mingw-w64-public"<mingw-w64-public@lists.sourceforge.net>
抄送：
Are you using GCC 4.9.0?
Since GCC 4.9.0, LTO-enabled object file doesn't contain normal object code but
GIMPLE bytecode by default.
If you want to link to a static library, you have to pass -fuse-linker-plugin
to let it extract LTO segments, and AFAIK it's enabled by default when -flto is
passed.
But I don't know why, the linker plugin of MinGW seems not working, it always
tell me some symbols are undefined.
So instead, you may pass -ffat-lto-objects to make it generate object files
with normal object code, but you won't benefit from LTO.
2014-04-26 18:39 GMT+08:00 lh_mouse <lh_mo...@126.com>:
Hello there, do I need -flto when building a static lib?
Here is an example:
E:\Desktop>gcc foo.c -c -flto
E:\Desktop>ar rcs libfoo.a foo.o
E:\Desktop>gcc main.c -L. -lfoo -flto
C:\Users\LH_Mouse\AppData\Local\Temp\ccc30oDd.ltrans0.ltrans.o:ccc30oDd.ltrans0.o:(.text+0x1e):
undefined reference to `foo'
collect2.exe: error: ld returned 1 exit status
Without those -flto options these commands worked just well.
Looking forward to you reply.
--------------
Best regards,
lh_mouse
2014-04-26
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