[Bug 534880]

[Cvs-commit]

The master branch has been updated by Lewis Hyatt <lhyatt at gcc.gnu.org>:

https://gcc.gnu.org/g:601dbf2a799f691688dfe78250b5bea2717b5b5e

commit r14-4185-g601dbf2a799f691688dfe78250b5bea2717b5b5e
Author: Lewis Hyatt <lhyatt at gmail.com>
Date:   Fri Sep 15 13:31:51 2023 -0400

    libcpp: Fix ICE on #include after a line marker directive [PR61474]
    
    As noted in the PR, GCC will segfault if a file name is first seen in a
    linemarker directive, and then later seen in a normal #include.  This is
    because the fake include process adds the file to the cache with a null PATH
    member. The normal #include finds this file in the cache and then attempts
    to use the null PATH.  Resolve by adding the file to the cache with a unique
    starting directory, so that the fake entry will only be found by a
    subsequent fake include, not by a real one.
    
    libcpp/ChangeLog:
    
            PR preprocessor/61474
            * files.cc (_cpp_find_file): Set DONT_READ to TRUE for fake
            include files.
            (_cpp_fake_include): Pass a unique cpp_dir* address so
            the fake file will not be found when looked up for real.
    
    gcc/testsuite/ChangeLog:
    
            PR preprocessor/61474
            * c-c++-common/cpp/pr61474-2.h: New test.
            * c-c++-common/cpp/pr61474.c: New test.
            * c-c++-common/cpp/pr61474.h: New test.

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https://bugs.launchpad.net/bugs/534880

Title:
  ICE (segfault) in preprocessor

Status in gcc:
  Fix Released
Status in gcc-defaults package in Ubuntu:
  Triaged

Bug description:
  gcc dies with segmentation violation on Intrepid and Karmic (didn't
  try others) with the following shell code; this is not an academic
  example but the maximally reduced version of my code:

  echo -e '#include "b.h"\n#include "c.h"' >a.c; echo '# 1 "c.h" 1'
  >b.h; gcc -E a.c

  ProblemType: Bug
  Architecture: i386
  DistroRelease: Ubuntu 8.10
  Package: gcc 4:4.3.1-1ubuntu2
  ProcEnviron:
   PATH=.:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gcc-defaults
  Uname: Linux 2.6.27-16-generic i686

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