From 890eb3d7c477b9fd2c6b1fa0785aca1d02a12e29 Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Tue, 25 Oct 2016 19:09:46 +0200
Subject: [PATCH] configure: make sure LTO does not optimize out the test
functions
Fixes trac ticket #5909
Bud-Id: https://bugs.gentoo.org/show_bug.cgi?id=598054
Acked-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
configure | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 7476ca88590..72ffaeacc58 100755
--- a/configure
+++ b/configure
@@ -1146,10 +1146,16 @@ check_func_headers(){
for hdr in $headers; do
print_include $hdr
done
+ echo "#include <stdint.h>"
for func in $funcs; do
echo "long check_$func(void) { return (long) $func; }"
done
- echo "int main(void) { return 0; }"
+ echo "int main(void) { int ret = 0;"
+ # LTO could optimize out the test functions without this
+ for func in $funcs; do
+ echo " ret |= ((intptr_t)check_$func) & 0xFFFF;"
+ done
+ echo "return ret; }"
} | check_ld "cc" "$@" && enable $funcs && enable_safe $headers
}
--
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