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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: Wed, 04 Jun 2014 11:15:39 +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:
     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 

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.
Hello Peter,
    I would appreciate any kind of help connected to configure script to be 
able to support -flto.

My suggestion:
1) we can detect if a compiler supports -flto
2) if so, we can define $ac_compile_without_lto = "$ac_compile -fno-lto"
3) otherwise, $ac_compile_without_lto = $ac_compile

What do you think about it?
Today, I found out another packages suffering from the same problem.


Changing this takes more effort, sorry.


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