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From: "Christoph H. Hochstaetter" <christoph@hochstaetter.de>
MIME-Version: 1.0
Date: Fri, 22 Aug 2014 02:20:29 +0200
Message-ID: <c2ded31183a3b8c46efb39206c7ec90d@mail.gmail.com>
Subject: ld segfaults with -flto after upgrading to gcc 4.8.3-3 (64-bit)
To: cygwin@cygwin.com
Content-Type: text/plain; charset=UTF-8

Hi,

I just upgraded gcc from 4.8.3-2 to 4.8.3-3. ld segfaults if gcc (and thus
ld) is used with link time optimization (-flto).

[ch@laptop2 ~] $ gcc -o hello.exe hello.c
[ch@laptop2 ~] $ ./hello.exe
Hello world!
[ch@laptop2 ~] $ rm -f hello.exe
[ch@laptop2 ~] $ gcc -o hello.exe hello.c -flto
collect2: error: ld terminated with signal 11 [Segmentation fault]
[ch@laptop2 ~] $ ./hello.exe
Hello world!
[ch@laptop2 ~] $

Besides from segfaulting ld creates a working hello.exe. I've also
compiled some more complex projects with several *.o files. EXEs all work
great. Tested on two different machines (both Windows 8.1 Update 1
64-bit). Binutils is 2.24.51-5 [GNU ld (GNU Binutils) 2.24.51.20140703]
before and after gcc upgrade. Reverting to gcc 4.8.3-2 solves the problem.

Same behavior if g++ is used to compile (works with 4.8.3-2, ld segfaults
with 4.8.3-3)

To be complete, here is my hello.c (segfault occurs with any file you
compile and link with -flto):

#include <stdio.h>

int main(int argc, char** argv)
{
        printf("Hello world!\n");
        return 0;
}

Regards

-Christoph

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