From 39b2ed0e73ac5b220accf7116bdaecb71ce759af Mon Sep 17 00:00:00 2001 From: Natanael Copa Date: Wed, 12 Sep 2012 09:06:51 +0000 Subject: [PATCH] configure: properly check if -lrt and -lm is needed Fixes build against uClibc. uClibc provides 2 versions of clock_gettime(), one with realtime support and one without (this is so you can avoid linking in -lrt unless actually needed). This means that the clock_gettime() don't need -lrt. We still need it for timer_create() so we check for this function in addition. We also need check if -lm is needed for isnan(). Both -lm and -lrt are needed for libs_qga. Signed-off-by: Natanael Copa Signed-off-by: Blue Swirl (cherry picked from commit 8bacde8d86a09699207d85d4bab06162aed18dc4) Signed-off-by: Michael Roth --- configure | 31 +++++++++++++++++++++++++++++-- 1 file changed, 29 insertions(+), 2 deletions(-) diff --git a/configure b/configure index 9e53cc2..a1f256c 100755 --- a/configure +++ b/configure @@ -2645,17 +2645,44 @@ fi ########################################## +# Do we need libm +cat > $TMPC << EOF +#include +int main(void) { return isnan(sin(0.0)); } +EOF +if compile_prog "" "" ; then + : +elif compile_prog "" "-lm" ; then + LIBS="-lm $LIBS" + libs_qga="-lm $libs_qga" +else + echo + echo "Error: libm check failed" + echo + exit 1 +fi + +########################################## # Do we need librt +# uClibc provides 2 versions of clock_gettime(), one with realtime +# support and one without. This means that the clock_gettime() don't +# need -lrt. We still need it for timer_create() so we check for this +# function in addition. cat > $TMPC < #include -int main(void) { return clock_gettime(CLOCK_REALTIME, NULL); } +int main(void) { + timer_create(CLOCK_REALTIME, NULL, NULL); + return clock_gettime(CLOCK_REALTIME, NULL); +} EOF if compile_prog "" "" ; then : -elif compile_prog "" "-lrt" ; then +# we need pthread for static linking. use previous pthread test result +elif compile_prog "" "-lrt $pthread_lib" ; then LIBS="-lrt $LIBS" + libs_qga="-lrt $libs_qga" fi if test "$darwin" != "yes" -a "$mingw32" != "yes" -a "$solaris" != yes -a \ -- 1.7.12.1