Add driver flags -ftrigraphs, -fno-trigraphs.
-trigraphs is now an alias for -ftrigraphs. -fno-trigraphs makes it possible
to explicitly disable trigraphs, which couldn't be done before.
clang -std=c++11 -fno-trigraphs
now builds without GNU extensions, but with trigraphs disabled. Previously,
trigraphs were only disabled in GNU modes or with -std=c++1z.
Make the new -f flags the cc1 interface too. This requires changing -trigraphs
to -ftrigraphs in a few cc1 tests.
Related to PR21974.
llvm-svn: 224790
diff --git a/clang/test/Driver/std.c b/clang/test/Driver/std.c
index c82e9f1..02dca66 100644
--- a/clang/test/Driver/std.c
+++ b/clang/test/Driver/std.c
@@ -1,8 +1,18 @@
-// RUN: %clang -std=c99 -trigraphs -std=gnu99 %s -E -o - | FileCheck -check-prefix=OVERRIDE %s
+// RUN: %clang -w -std=c99 -trigraphs -std=gnu99 %s -E -o - | FileCheck -check-prefix=OVERRIDE %s
// OVERRIDE: ??(??)
-// RUN: %clang -ansi %s -E -o - | FileCheck -check-prefix=ANSI %s
+// RUN: %clang -w -std=c99 -trigraphs -std=gnu99 %s -E -o - | FileCheck -check-prefix=FOVERRIDE %s
+// FOVERRIDE: ??(??)
+// RUN: %clang -w -ansi %s -E -o - | FileCheck -check-prefix=ANSI %s
// ANSI: []
-// RUN: %clang -std=gnu99 -trigraphs %s -E -o - | FileCheck -check-prefix=EXPLICIT %s
+// RUN: %clang -w -ansi %s -fno-trigraphs -E -o - | FileCheck -check-prefix=ANSI-OVERRIDE %s
+// ANSI-OVERRIDE: ??(??)
+// RUN: %clang -w -std=gnu99 -trigraphs %s -E -o - | FileCheck -check-prefix=EXPLICIT %s
// EXPLICIT: []
+// RUN: %clang -w -std=gnu99 -ftrigraphs %s -E -o - | FileCheck -check-prefix=FEXPLICIT %s
+// FEXPLICIT: []
+// RUN: %clang -w -ftrigraphs -fno-trigraphs %s -E -o - | FileCheck -check-prefix=ONOFF %s
+// ONOFF: ??(??)
+// RUN: %clang -w -fno-trigraphs -trigraphs %s -E -o - | FileCheck -check-prefix=OFFFON %s
+// OFFFON: []
??(??)