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From: "nickbegg at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112587] New: -save-temps with p1689 dep output causes null
 ptr dereference
Date: Fri, 17 Nov 2023 12:30:47 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112587

            Bug ID: 112587
           Summary: -save-temps with p1689 dep output causes null ptr
                    dereference
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: nickbegg at gmail dot com
  Target Milestone: ---

Whilst debugging a separate bug with a trivial module, GCC crashes with a n=
ull
ptr dereference. I have --save-temps on.

The problem seems to start here:

gcc/c-family/c-opts.cc:1340
  fatal_error (input_location, "%<-MF%> and %<-fdeps-file=3D%> cannot share=
 an
output file %s: %m", fdeps_file);

The cc1plus process looks like it's not invoked with -fdeps-file, and thus
fdeps_file is null. Printing this diagnostic causes a crash. It seems to cr=
ash
before a bug report is written out.

This is the version -

GNU C++23 (GCC) version 14.0.0 20231117 (experimental) (x86_64-pc-linux-gnu)
(git rev ba3f5b8465ef7b278ea33ff94cd85b9638058635)

This is the cmdline used to launch gcc  (launched from cmake/ninja) -

/home/nick/gcc-trunk-debug-inst/bin/g++ -D_GLIBCXX_ASSERTIONS -D_GLIBCXX_DE=
BUG=20
-std=3Dgnu++23 -Wall -Wextra -v -freport-bug -save-temps -MD -MT
CMakeFiles/moduleMin.dir/modA.mpp.o -MF CMakeFiles/moduleMin.dir/modA.mpp.o=
.d
-fmodules-ts -fmodule-mapper=3DCMakeFiles/moduleMin.dir/modA.mpp.o.modmap -=
MD
-fdeps-format=3Dp1689r5 -x c++ -o CMakeFiles/moduleMin.dir/modA.mpp.o -c
/home/nick/src/moduleMin/modA.mpp

... and the cmdline to launch cc1plus which crashes -

 /home/nick/gcc-trunk-debug-inst/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/cc1=
plus
-fpreprocessed CMakeFiles/moduleMin.dir/modA.mpp.ii -quiet -dumpdir
CMakeFiles/moduleMin.dir/ -dumpbase modA.mpp.mpp -dumpbase-ext .mpp
-mtune=3Dgeneric -march=3Dx86-64 -Wall -Wextra -std=3Dgnu++23 -version -fre=
port-bug
-fmodules-ts -fmodule-mapper=3DCMakeFiles/moduleMin.dir/modA.mpp.o.modmap
-fdeps-format=3Dp1689r5 -o CMakeFiles/moduleMin.dir/modA.mpp.s=