From: Hans Kristian Rosbach <hk-git@circlestorm.org>
Date: Thu, 6 Nov 2014 19:54:38 +0000 (+0100)
Subject: Add configure test for __builtin_ctzl() support in compiler
X-Git-Tag: 1.9.9-b1~893
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cc48d6daddd6cb70f65cf889128c4c05a48e666d;p=thirdparty%2Fzlib-ng.git

Add configure test for __builtin_ctzl() support in compiler
---

diff --git a/configure b/configure
index 6b5d8773b..0f26657c8 100755
--- a/configure
+++ b/configure
@@ -582,6 +582,23 @@ EOF
   fi
 fi
 
+# Check for __builtin_ctzl() support in compiler
+cat > $test.c << EOF
+int main(void)
+{
+    unsigned int zero = 0;
+    long test = __builtin_ctzl(zero);
+    return 0;
+}
+EOF
+if try ${CC} ${CFLAGS} $test.c; then
+    echo "Checking for __builtin_ctzl ... Yes." | tee -a configure.log
+    CFLAGS="$CFLAGS -DHAVE_BUILTIN_CTZL"
+    SFLAGS="$SFLAGS -DHAVE_BUILTIN_CTZL"
+else
+    echo "Checking for __builtin_ztzl ... No." | tee -a configure.log
+fi
+
 # Check for SSE2 intrinsics
 cat > $test.c << EOF
 #include <immintrin.h>