Bug 1440013 For MinGW build, pass -Wa,-mbig-obj to solve 'too many sections' errors r=glandium

MozReview-Commit-ID: 9ObJnrcpeKe

--HG--
extra : rebase_source : fb071396e0d34e0baa084cb9b238944f7ffe066c

build/autoconf/compiler-opts.m4

@@ -123,6 +123,12 @@ if test "$GNU_CC"; then
     if test -z "$DEVELOPER_OPTIONS"; then
         CFLAGS="$CFLAGS -ffunction-sections -fdata-sections"
         CXXFLAGS="$CXXFLAGS -ffunction-sections -fdata-sections"
+
+        # For MinGW, we need big-obj otherwise we create too many sections in Unified builds
+        if test "${OS_ARCH}" = "WINNT"; then
+            CFLAGS="$CFLAGS -Wa,-mbig-obj"
+            CXXFLAGS="$CXXFLAGS -Wa,-mbig-obj"
+        fi
     fi
     CFLAGS="$CFLAGS -fno-math-errno"
     CXXFLAGS="$CXXFLAGS -fno-exceptions -fno-math-errno"