Bug ID: 91440
           Summary: Precompiled headers regression in 9.2
           Product: gcc
           Version: 9.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot
          Reporter: rcopley at gmail dot com
  Target Milestone: ---

In some circumstances, builds using precompiled headers which worked with GCC
9.1 no longer work with GCC 9.2.

Complete test case (as a bash script):

>precompiled.h echo "void f();"
>main.c echo "void f() {}"
mkdir some-subdir
gcc -Winvalid-pch -pedantic -c -o some-subdir/precompiled.h.gch precompiled.h
gcc -Winvalid-pch -pedantic -c -include some-subdir/precompiled.h -o main.o

Expected behaviour (as seen with GCC 9.1) is to succeed, with no output.

Actual behaviour with GCC 9.2 is to fail, with output:

cc1.exe: warning: ./.obj/precompiled.h.gch: had text segment at different
cc1.exe: error: one or more PCH files were found, but they were invalid
cc1.exe: fatal error: .obj/precompiled.h: No such file or directory

(The errors don't happen if you remove all occurrences of " -pedantic" and/or
"some-subdir/" from the recipe.)

Output of gcc -v (in 9.2):
Using built-in specs.
Target: x86_64-w64-mingw32
Configured with: ../gcc-9.2.0/configure --prefix=/mingw64
--with-local-prefix=/mingw64/local --build=x86_64-w64-mingw32
--host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32
--libexecdir=/mingw64/lib --enable-bootstrap --with-arch=x86-64
--with-tune=generic --enable-languages=c,lto,c++,fortran,ada,objc,obj-c++
--enable-shared --enable-static --enable-libatomic --enable-threads=posix
--enable-graphite --enable-fully-dynamic-string
--enable-libstdcxx-filesystem-ts=yes --enable-libstdcxx-time=yes
--disable-libstdcxx-pch --disable-libstdcxx-debug --disable-isl-version-check
--enable-lto --enable-libgomp --disable-multilib --enable-checking=release
--disable-rpath --disable-win32-registry --disable-nls --disable-werror
--disable-symvers --enable-plugin --with-libiconv --with-system-zlib
--with-gmp=/mingw64 --with-mpfr=/mingw64 --with-mpc=/mingw64
--with-isl=/mingw64 --with-pkgversion='Rev1, Built by MSYS2 project'
--with-bugurl= --with-gnu-as
Thread model: posix
gcc version 9.2.0 (Rev1, Built by MSYS2 project)

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