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[Qemu-devel] [PATCH] configure: don't optimize away avx2 test functions
From: |
Mohammed Gamal |
Subject: |
[Qemu-devel] [PATCH] configure: don't optimize away avx2 test functions |
Date: |
Tue, 21 Jun 2016 11:10:25 +0200 |
The configure script contains an embedded test C function
to test for avx2 support. It gets optimized away with
gcc 4.7 on wheezy.
Add __attribute__((optimize("O0"))) to it in order
to prevent optimizing it away
Signed-off-by: Mohammed Gamal <address@hidden>
---
configure | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configure b/configure
index 8ecf29d..ba31d3a 100755
--- a/configure
+++ b/configure
@@ -1782,7 +1782,7 @@ fi
cat > $TMPC << EOF
static void bar(void) {}
-static void *bar_ifunc(void) {return (void*) bar;}
+static void __attribute__((optimize("O0"))) *bar_ifunc(void) {return (void*)
bar;}
static void foo(void) __attribute__((ifunc("bar_ifunc")));
int main(void) { foo(); return 0; }
EOF
--
1.9.1
- [Qemu-devel] [PATCH] configure: don't optimize away avx2 test functions,
Mohammed Gamal <=