curl-compilers.m4: -Wstrict-aliasing=3 for warning enabled gcc and clang builds

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 2752f65..29507ba 100644 (file)
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -21,7 +21,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 61
+# serial 62
 
 
 dnl CURL_CHECK_COMPILER
@@ -875,6 +875,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
           tmp_CFLAGS="$tmp_CFLAGS -Wcast-align"
           tmp_CFLAGS="$tmp_CFLAGS -Wno-system-headers"
           tmp_CFLAGS="$tmp_CFLAGS -Wshorten-64-to-32"
+          tmp_CFLAGS="$tmp_CFLAGS -Wstrict-aliasing=3"
           #
           dnl Only clang 1.1 or later
           if test "$compiler_num" -ge "101"; then
@@ -965,6 +966,11 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
             tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
           fi
           #
+          dnl Only gcc 4.0 or later
+          if test "$compiler_num" -ge "400"; then
+            tmp_CFLAGS="$tmp_CFLAGS -Wstrict-aliasing=3"
+          fi
+          #
           dnl Only gcc 4.2 or later
           if test "$compiler_num" -ge "402"; then
             tmp_CFLAGS="$tmp_CFLAGS -Wcast-align"