_Pragma is not supported

[jordr]

The use of _Pragma instead of #pragma is accepted in C99. [1]
pycparser raises a ParseError on this minimal main.c:

/* main.c */
_Pragma ("GCC dependency \"parse.y\"")

int main() {
        return 0;
}

Python3+pycparser prompt:

from pycparser import parse_file, c_generator
parse_file('./main.c', use_cpp=False)

Output:

>>> parse_file('./main.c', use_cpp=False)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/__init__.py", line 90, in parse_file
    return parser.parse(text, filename)
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/c_parser.py", line 147, in parse
    return self.cparser.parse(
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/ply/yacc.py", line 331, in parse
    return self.parseopt_notrack(input, lexer, debug, tracking, tokenfunc)
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/ply/yacc.py", line 1199, in parseopt_notrack
    tok = call_errorfunc(self.errorfunc, errtoken, self)
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/ply/yacc.py", line 193, in call_errorfunc
    r = errorfunc(token)
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/c_parser.py", line 1931, in p_error
    self._parse_error(
  File "/home/jordy/.local/lib/python3.8/site-packages/pycparser/plyparser.py", line 67, in _parse_error
    raise ParseError("%s: %s" % (coord, msg))
pycparser.plyparser.ParseError: ./main.c:1:10: before: "GCC dependency \"parse.y\""

[1] https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html

[JulianKemmerer]

Interesting - maybe a regression or something I am using pycparser right now to parse _Pragmas just fine
(though surely my version is quite old, ~2018?)

my code where I use it (string replacement for macro stuff that doesnt work with
#pragma THING syntax doesnt work where THING could be another macro etc.)

#define PRAGMA_MESSAGE(x) _Pragma(#x)
// And then PRAGMA_MESSAGE() macro is used places
PRAGMA_MESSAGE(THING)

Maybe someone with string escape syntax or preprocessor used or not
🤷

[eliben]

This is a gray area for pycparser since preprocessor directives start with #. The preprocessor can leave some pragmas in the source so they are kind-of supported. I don't mind supporting _Pragma similarly if the PR is not too complicated