Implement handling of file entry/exit notifications from GNU

line markers, including maintenance of the virtual include stack.

For something like this:

# 42 "bar.c" 1
# 142 "bar2.c" 1

#warning zappa
# 92 "bar.c" 2
#warning gonzo
# 102 "foo.c" 2
#warning bonkta


we now produce these three warnings:

#1:
In file included from foo.c:3:
In file included from bar.c:42:
bar2.c:143:2: warning: #warning zappa
#warning zappa
 ^

#2:
In file included from foo.c:3:
bar.c:92:2: warning: #warning gonzo
#warning gonzo
 ^

#3:
foo.c:102:2: warning: #warning bonkta
#warning bonkta
 ^

llvm-svn: 63722

1 files changed, 2 insertions, 0 deletions

diff --git a/clang/include/clang/Basic/DiagnosticLexKinds.def b/clang/include/clang/Basic/DiagnosticLexKinds.def
index 8c9a82688a7..ad08ba976cb 100644
--- a/clang/include/clang/Basic/DiagnosticLexKinds.def
+++ b/clang/include/clang/Basic/DiagnosticLexKinds.def
@@ -274,6 +274,8 @@ DIAG(err_pp_linemarker_invalid_filename, ERROR,
      "invalid filename for line marker directive")
 DIAG(err_pp_linemarker_invalid_flag, ERROR,
      "invalid flag line marker directive")
+DIAG(err_pp_linemarker_invalid_pop, ERROR,
+     "invalid line marker flag '2': cannot pop empty include stack")
 DIAG(ext_pp_line_too_big, EXTENSION,
      "C requires #line number to be less than %0, allowed as extension")