[Bug preprocessor/64698] New: preprocessor ignores #pragma GCC diagnostic when using -save-temps

[Bug preprocessor/64698] New: preprocessor ignores #pragma GCC diagnostic when using -save-temps

[markus at oberhumer dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64698

            Bug ID: 64698
           Summary: preprocessor ignores #pragma GCC diagnostic when using
                    -save-temps
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
          Assignee: unassigned at gcc dot gnu.org
          Reporter: markus at oberhumer dot com

This could be related to bug 53431, though this report is about C and not C++.

Actually I had thought that "-save-temps" just dumps the internal state, but
that does not seem to be true.

The following code:

#pragma GCC diagnostic ignored "-Wundef"
#if FOO
#endif
int main (void) { return 42; }

compiled with 

gcc-4.9 -Wundef -Werror -save-temps -c bug_wundef.c

gives:

bug_wundef.c:2:5: error: "FOO" is not defined [-Werror=undef]
 #if FOO
     ^
cc1: all warnings being treated as errors

On the contrary

gcc-4.9 -Wundef -Werror -c bug_wundef.c

does not give any error.

[Bug preprocessor/64698] preprocessor ignores #pragma GCC diagnostic when using -save-temps

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64698

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-01-20
                 CC|                            |manu at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Does it go through c-ppoutput.c(scan_translation_unit)? If so, this is the same
issue as PR53920.
>From gcc-bugs-return-474141-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Jan 20 22:52:21 2015
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Subject: [Bug c++/64647] [5 Regression] [C++14] std::__max_element contains code not allowed in constexpr function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd647

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jason at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |jason at gcc dot gnu.org

[Bug preprocessor/64698] preprocessor ignores #pragma GCC diagnostic when using -save-temps

[markus at oberhumer dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64698

--- Comment #2 from Markus F.X.J. Oberhumer <markus at oberhumer dot com> ---
Still a problem in 2021 with gcc-11.1.0

[Bug preprocessor/64698] preprocessor ignores #pragma GCC diagnostic when using -save-temps

[lhyatt at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64698

Lewis Hyatt <lhyatt at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE
                 CC|                            |lhyatt at gcc dot gnu.org

--- Comment #3 from Lewis Hyatt <lhyatt at gcc dot gnu.org> ---
It is indeed a dup of PR53920. Also, I have a patch awaiting review for
PR53431; that fixes all 3.

*** This bug has been marked as a duplicate of bug 53920 ***