[cfe-commits] [patch][preprocessor] Remember to exit <command line>

[Rafael Espindola]

This is an updated version of an old patch.

clang's preprocessor output for
-------------------------------------------
int main(int argc, char*argv[]) {
  return 0;
}
------------------------------------------
is
------------------------------------------
# 1 "test.c"
# 1 "test.c" 1
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 113 "<built-in>" 3
# 113 "<command line>" 1
# 1 "test.c" 2
int main(int argc, char*argv[]) {
  return 0;
}
-----------------------------------

Compiling this with gcc produces the warning 'line-map.c: file
"test.c" left but not entered'.  The wording is a bit confusing, but
it looks like what gcc is complaining about is that we have the
transitions

test.c -> <built-in> -> <command line> -> test.c

Adding a <command line> -> <built-in> transition avoids the warning.
This is done with the line

# 114 "<built-in>" 2

after

# 113 "<command line>" 1

Cheers,
-- 
Rafael Ávila de Espíndola
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