https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91999
Bug ID: 91999
Summary: pch_open_file picks up a first found precompiled
header even if it's not suitable
Product: gcc
Version: 9.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: pch
Assignee: unassigned at gcc dot gnu.org
Reporter: guriev-ns at ya dot ru
Target Milestone: ---
In the following example g++ uses C precompiled header if it exists, although
there is a C++ precompiled header nearby in the all.h.gch directory. The error
occurs when -Winvalid-pch is set and there is a precompiled header for C in
.gch directory.
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ head *
==> all.h <==
#ifndef __cplusplus
# include <stdio.h>
#else
# include <iostream>
#endif
==> t1.c <==
#include "all.h"
int main (void)
{
printf("Hello!\n");
return 0;
}
==> t2.C <==
#include "all.h"
int main()
{
std::cout << "Hello!" << std::endl;
}
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ mkdir all.h.gch
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ gcc-9 -Werror -Wall -Wextra -x c-header
all.h -o all.h.gch/.c
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ g++-9 -Werror -Wall -Wextra -x c++-header
all.h -o all.h.gch/.c++
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ gcc-9 -Werror -Wall -Wextra -Winvalid-pch
t1.c -o t1.out
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ g++-9 -Werror -Wall -Wextra -Winvalid-pch
t2.C -o t2.out
t2.C:1:17: error: all.h.gch/.c: not for GNU C++14 [-Werror]
1 | #include "all.h"
| ^
cc1plus: all warnings being treated as errors
mymedia@barberry:/tmp/tmp.uz5iSoQUFL$ gcc-9 -v
Using built-in specs.
COLLECT_GCC=gcc-9
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 9.2.1-8'
--with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--with-target-system-zlib=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.2.1 20190909 (Debian 9.2.1-8)
