Bug 821502 - Disable -fstrict-aliasing in JS for GCC 4.4 and earlier …

…on Linux and Android. r=glandium,terrence; a=bajaj

js/src/configure.in

@@ -4121,6 +4121,29 @@ else
   fi
 fi
 
+dnl ========================================================
+dnl = Disable -fstrict-aliasing on Linux/Android with GCC 4.4 and earlier.
+dnl = See bug 821502.
+dnl ========================================================
+case "$target" in
+*-android*|*-linuxandroid*|*-*linux*)
+    if test "$GNU_CC"; then
+        changequote(,)
+        GCC_VERSION_FULL=`echo "$CXX_VERSION" | $PERL -pe 's/^.*gcc version ([^ ]*).*/$1/'`
+        GCC_VERSION=`echo "$GCC_VERSION_FULL" | $PERL -pe '(split(/\./))[0]>=4&&s/(^\d*\.\d*).*/$1/;'`
+        changequote([,])
+
+        GCC_MAJOR_VERSION=`echo ${GCC_VERSION} | $AWK -F\. '{ print $1 }'`
+        GCC_MINOR_VERSION=`echo ${GCC_VERSION} | $AWK -F\. '{ print $2 }'`
+
+        dnl GCC 3.x isn't supported, so we don't need to check for that.
+        if test "$GCC_MAJOR_VERSION" -eq "4" -a "$GCC_MINOR_VERSION" -lt "5" ; then
+            CFLAGS="$CFLAGS -fno-strict-aliasing"
+            CXXFLAGS="$CXXFLAGS -fno-strict-aliasing"
+        fi
+    fi
+esac
+
 dnl ========================================================
 dnl = Link js shell to system readline
 dnl ========================================================