[Qemu-devel] [PULL 3/3] configure: Fix -lm test, so that tools can be compiled on hosts that require -lm

[Paolo Bonzini <pbonzini@redhat.com>]

From: Alexey Kardashevskiy <aik@ozlabs.ru>

The existing test whether "-lm" needs to be included or not is
insufficient as it reports false negative on Fedora20/ppc64.
This happens because sin(0.0) is a constant value which compiler
can safely throw away and therefore there is no need to add "-lm".
As the result, qemu-nbd/qemu-io/qemu-img tools cannot compile.

This adds a global variable and uses it in the test to prevent
from optimization.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
[Remove now useless -lm addition in Makefile.target. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 Makefile.target | 4 ----
 configure       | 2 +-
 2 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/Makefile.target b/Makefile.target
index 6089d29..137d0b0 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -163,10 +163,6 @@ dummy := $(call unnest-vars,.., \
 all-obj-y += $(common-obj-y)
 all-obj-$(CONFIG_SOFTMMU) += $(block-obj-y)
 
-ifndef CONFIG_HAIKU
-LIBS+=-lm
-endif
-
 # build either PROG or PROGW
 $(QEMU_PROG_BUILD): $(all-obj-y) ../libqemuutil.a ../libqemustub.a
 	$(call LINK,$^)
diff --git a/configure b/configure
index 23ecb37..6dd44a9 100755
--- a/configure
+++ b/configure
@@ -3453,7 +3453,7 @@ fi
 # Do we need libm
 cat > $TMPC << EOF
 #include <math.h>
-int main(void) { return isnan(sin(0.0)); }
+double x; int main(void) {return isnan(sin(x));}
 EOF
 if compile_prog "" "" ; then
   :
-- 
1.8.3.1