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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Julian Taylor <jtaylor.debian <at> googlemail.com>
Subject: bug#17750: closed (bug#17750: libtool strips fcilkplus and
 sanitizer flags)
Date: Fri, 31 May 2024 13:45:02 +0000

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Your bug report

#17750: libtool strips fcilkplus and sanitizer flags

which was filed against the libtool package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 17750 <at> debbugs.gnu.org.

-- 
17750: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=17750
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: 17750-done <at> debbugs.gnu.org
Cc: Julian Taylor <jtaylor.debian <at> googlemail.com>,
 Vincent Lefevre <vincent <at> vinc17.net>
Subject: bug#17750: libtool strips fcilkplus and sanitizer flags
Date: Fri, 31 May 2024 16:42:54 +0300

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Thank you for both for the bug report and patch. It has been applied to
the development branch in libtool.

-- 
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

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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

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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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