From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Tue, 1 Jul 2014 07:30:27 +0000 (+1000)
Subject: configure: Fix -lm test, so that tools can be compiled on hosts that require -lm
X-Git-Tag: qemu-xen-4.6.0-rc1~336^2
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=f80ea9862fed7ca89a672785bdce0e2611f9ba97;p=qemu-upstream-4.6-testing.git

configure: Fix -lm test, so that tools can be compiled on hosts that require -lm

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>
[Use Peter's improvement on the test to fool LTO, and remove the
 now useless -lm addition in Makefile.target. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/Makefile.target b/Makefile.target
index 6089d290d..137d0b051 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 23ecb37c4..ed41eda4d 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)); }
+int main(int argc, char **argv) { return isnan(sin((double)argc)); }
 EOF
 if compile_prog "" "" ; then
   :