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From: "gcc at mailinator dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug pch/115312] New: [14/15 Regression] ICE when including a PCH
 via compiler option -include
Date: Sat, 01 Jun 2024 03:37:20 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: pch
X-Bugzilla-Version: 14.1.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: gcc at mailinator dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115312

            Bug ID: 115312
           Summary: [14/15 Regression] ICE when including a PCH via
                    compiler option -include
           Product: gcc
           Version: 14.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: pch
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc at mailinator dot com
  Target Milestone: ---
              Host: x86_64-w64-mingw32
            Target: x86_64-w64-mingw32
             Build: x86_64-w64-mingw32

An internal compiler error is triggered in GCC 14.1.0 when including a
precompiled header via compiler option -include. A testcase is provided bel=
ow:

```
touch test.cpp
touch test.h

g++ test.h
g++ -include test.h -c test.cpp -save-temps
test.cpp:1: internal compiler error: in c_init_preprocess, at cp/parser.cc:=
790
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
See <https://gcc.gnu.org/bugs/> for instructions.
```

This issue shows up on (i686|x86_64)-w64-mingw32 platforms. GCC 14.1.0 rele=
ases
from MSYS2 and WinLibs projects are affected.

I have done some tests with prebuilt GCC 14 pre-releases from WinLibs proje=
ct.

- Last working GCC 14 pre-release is from snapshot gcc-14-20231119.
- First GCC 14 pre-release with this issue is from snapshot gcc-14-20231217=
.=