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Author SHA1 Message Date
Nico Weber 007215044b 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
 2014-12-23 22:32:37 +00:00
Nico Weber b62ba516e7 Disable trigraphs in microsoft mode by default. Matches cl.exe. 
The default value of Opts.Trigraphs now no longer depends solely on the
language input kind, so move the code out of setLangDefaults().  Also make
sure that Opts.MSVCCompat is set before the Trigraph code runs.

Related to PR21974.

llvm-svn: 224719
 2014-12-22 18:35:03 +00:00
Nico Weber 4f371b031b Add test coverage for cc1's trigraph option handling. 
llvm-svn: 224714
 2014-12-22 17:56:50 +00:00