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bug#17294: Bug - nm_test_func check is confused with -flto


From: Martin Liška
Subject: bug#17294: Bug - nm_test_func check is confused with -flto
Date: Tue, 20 May 2014 13:32:02 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

On 05/17/2014 02:46 AM, Peter Rosin wrote:
On 2014-04-18 15:01, Martin Liška wrote:
Hello,
     starting with GCC 4.9.0, compiler will use just slim objects files during 
LTO compilation. That means, no assembly output is put to object files. I 
noticed that libtool uses nm tools to extract symbol from object file: 
http://pastebin.com/RF1VubdR. Would it be possible to add -fno-lto for this 
check?

I think there should be added '-fno-lto' at line 14:
   (eval $ac_compile -fno-lto) 2>&5

What do you think about that?
Hi, and sorry for the late response.

I think that it is not possible to blindly add -fno-lto without knowing
if the compiler understands -fno-lto.

Changing this takes more effort, sorry.

Cheers,
Peter


Hello,
I understand that suggested option is probably simple. How can we decorate some LTO sensitive checks with -flto if supported by a compiler?

Thanks,
Martin





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