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

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Package: libtool; Reported by: Julian Taylor <jtaylor.debian@HIDDEN>; dated Tue, 10 Jun 2014 20:23:01 UTC; Maintainer for libtool is bug-libtool@HIDDEN.

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Message-ID: <53976641.3070305@HIDDEN>
Date: Tue, 10 Jun 2014 22:10:41 +0200
From: Julian Taylor <jtaylor.debian@HIDDEN>
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Subject: libtool strips fcilkplus and sanitizer flags
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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 librar=
y.
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 =3D cilk_spawn atoi(a);
return a;
}


then configure build with:
=2E/configure  CFLAGS=3D"-fcilkplus" LDFLAGS=3D"-fcilkplus" CC=3Dgcc-4.9


during linking -fcilkplus is not used and the library is underlinked
root@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 =3D> /lib/x86_64-linux-gnu/libm.so.6 (0x00007eff507f3000)
	libc.so.6 =3D> /lib/x86_64-linux-gnu/libc.so.6 (0x00007eff5044a000)
	libdl.so.2 =3D> /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.s=
o)
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.s=
o)

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=3D flags are stripped from LDFLAGS, they
should probably be added too.

Cheers,
Julian Taylor


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Acknowledgement sent to Julian Taylor <jtaylor.debian@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-libtool@HIDDEN. Full text available.
Report forwarded to bug-libtool@HIDDEN:
bug#17750; Package libtool. Full text available.
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Last modified: Fri, 31 Oct 2014 17:00:04 UTC

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