[Bug pch/115312] [14/15 Regression] ICE when including a PCH via compiler option -include since r14-5836

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115312

--- Comment #9 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Lewis Hyatt <lhyatt@gcc.gnu.org>:

https://gcc.gnu.org/g:038d64f62271ddc62aa35d0a5dfd3843fdb9e6d7

commit r15-1803-g038d64f62271ddc62aa35d0a5dfd3843fdb9e6d7
Author: Lewis Hyatt <lhyatt@gmail.com>
Date:   Sat Jun 15 21:09:01 2024 -0400

    preprocessor: Create the parser before handling command-line includes
[PR115312]

    Since r14-2893, we create a parser object in preprocess-only mode for the
    purpose of parsing #pragma while preprocessing. The parser object was
    formerly created after calling c_finish_options(), which leads to problems
    on platforms that don't use stdc-predef.h (such as MinGW, as reported in
    the PR). On such platforms, the call to c_finish_options() will process
    the first command-line-specified include file. If that includes a PCH, then
    c-ppoutput.cc will encounter a state it did not anticipate. Fix it by
    creating the parser prior to calling c_finish_options().

    gcc/c-family/ChangeLog:

            PR pch/115312
            * c-opts.cc (c_common_init): Call c_init_preprocess() before
            c_finish_options() so that a parser is available to process any
            includes specified on the command line.

    gcc/testsuite/ChangeLog:

            PR pch/115312
            * g++.dg/pch/pr115312.C: New test.
            * g++.dg/pch/pr115312.Hs: New test.