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: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#17750: closed (libtool strips fcilkplus and sanitizer flags)
Date: Fri, 31 May 2024 13:45:02 +0000

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Your message dated Fri, 31 May 2024 16:42:54 +0300
with message-id <5ffc444b-0516-4187-bd56-4542f3be6caf <at> gmail.com>
and subject line bug#17750: libtool strips fcilkplus and sanitizer flags
has caused the debbugs.gnu.org bug report #17750,
regarding libtool strips fcilkplus and sanitizer flags
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> 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: 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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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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