GNU bug report logs - #17750
libtool strips fcilkplus and sanitizer flags

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Julian Taylor <jtaylor.debian <at> googlemail.com>
To: bug-libtool <at> gnu.org
Subject: libtool strips fcilkplus and sanitizer flags
Date: Tue, 10 Jun 2014 22:10:41 +0200

[Message part 1 (text/plain, inline)]

hi,
gcc-4.9 now supports cilkplus with the -fcilkplus flag.
libtool strips this flag from LDFLAGS leading to an wrongly linked library.
To reproduce choose a random libtool based project (e.g. libmatheval)
and add this function in a random file (e.g. lib/node.c):


#include <cilk/cilk.h>
int n(char * a)
{
a = cilk_spawn atoi(a);
return a;
}


then configure build with:
./configure  CFLAGS="-fcilkplus" LDFLAGS="-fcilkplus" CC=gcc-4.9


during linking -fcilkplus is not used and the library is underlinked
root <at> ubuntu:/libmatheval-1.1.11+dfsg# ldd -r ./lib/.libs/libmatheval.so
	linux-vdso.so.1 (0x00007fffccdc4000)
	/usr/lib/libeatmydata/libeatmydata.so (0x00007eff50cfd000)
	/usr/lib/cowdancer/libcowdancer.so (0x00007eff50af9000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007eff507f3000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007eff5044a000)
	libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007eff50246000)
	/lib64/ld-linux-x86-64.so.2 (0x00007eff5110f000)
undefined symbol: __cilkrts_rethrow	(./lib/.libs/libmatheval.so)
undefined symbol: __cilkrts_enter_frame_1	(./lib/.libs/libmatheval.so)
undefined symbol: __cilkrts_save_fp_ctrl_state	(./lib/.libs/libmatheval.so)
undefined symbol: __cilkrts_sync	(./lib/.libs/libmatheval.so)
undefined symbol: __cilkrts_leave_frame	(./lib/.libs/libmatheval.so)
undefined symbol: __cilkrts_enter_frame_fast_1	(./lib/.libs/libmatheval.so)

it needs to be linked against libcilkrts.so.5

This is identical to libtools stripping of fopenmp and the fix is the
same, add -fcilkplus to the whitelist.

Similar the new -fsanitizer= flags are stripped from LDFLAGS, they
should probably be added too.

Cheers,
Julian Taylor

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Message #8 received at 17750 <at> debbugs.gnu.org (full text, mbox):

From: Vincent Lefevre <vincent <at> vinc17.net>
To: Julian Taylor <jtaylor.debian <at> googlemail.com>
Cc: 17750 <at> debbugs.gnu.org
Subject: Re: libtool strips fcilkplus and sanitizer flags
Date: Fri, 3 May 2019 15:55:53 +0200

Hi,

On 2014-06-10 22:10:41 +0200, Julian Taylor wrote:
> This is identical to libtools stripping of fopenmp and the fix is the
> same, add -fcilkplus to the whitelist.
> 
> Similar the new -fsanitizer= flags are stripped from LDFLAGS, they
> should probably be added too.

The -fsanitizer=* one was fixed in 2015, but there are still issues
due to the fact that -static-* options are not passed to the linker
(-static-libasan in my case).

I've posted a patch for both -fcilkplus and -static-* there:

  http://lists.gnu.org/archive/html/libtool-patches/2019-05/msg00000.html

For Debian users, it does not apply, and I've posted a specific
patch there:

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751161#14

-- 
Vincent Lefèvre <vincent <at> vinc17.net> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

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