Bug 1298472 - part 1 - suppress more warnings in clang-cl; r=glandium

clang-cl accepts #pragma intrinsic like MSVC, but ignores it, unlike
MSVC.  We're not concerned with the difference here, so just ignore
the warning.

MozReview-Commit-ID: 3FrVqHpIntq

--HG--
extra : rebase_source : 2609c513f287246e46b436a15d2a786164f91b13

js/src/old-configure.in

@@ -791,6 +791,10 @@ case "$target" in
             # use such pragmas, so just ignore them.
             CFLAGS="$CFLAGS -Wno-unknown-pragmas"
             CXXFLAGS="$CXXFLAGS -Wno-unknown-pragmas"
+            # We get errors about various #pragma intrinsic directives from
+            # clang-cl, and we don't need to hear about those.
+            CFLAGS="$CFLAGS -Wno-ignored-pragmas"
+            CXXFLAGS="$CXXFLAGS -Wno-ignored-pragmas"
             # clang-cl's Intrin.h marks things like _ReadWriteBarrier
             # as __attribute((__deprecated__)).  This is nice to know,
             # but since we don't get the equivalent warning from MSVC,

old-configure.in

@@ -1143,6 +1143,10 @@ case "$target" in
             # use such pragmas, so just ignore them.
             CFLAGS="$CFLAGS -Wno-unknown-pragmas"
             CXXFLAGS="$CXXFLAGS -Wno-unknown-pragmas"
+            # We get errors about various #pragma intrinsic directives from
+            # clang-cl, and we don't need to hear about those.
+            CFLAGS="$CFLAGS -Wno-ignored-pragmas"
+            CXXFLAGS="$CXXFLAGS -Wno-ignored-pragmas"
             # clang-cl's Intrin.h marks things like _ReadWriteBarrier
             # as __attribute((__deprecated__)).  This is nice to know,
             # but since we don't get the equivalent warning from MSVC,