[Bug c/88944] New: Suggested alternative C stdbool.h

[jg at jguk dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88944

            Bug ID: 88944
           Summary: Suggested alternative C stdbool.h
           Product: gcc
           Version: 8.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jg at jguk dot org
  Target Milestone: ---

Created attachment 45478
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45478&action=edit
testcase

Would be good if GCC could suggest <stdbool.h>

$ gcc -o undef undef.c
undef.c: In function ‘main’:
undef.c:4:5: error: unknown type name ‘bool’; did you mean ‘_Bool’?
     bool a;
     ^~~~
     _Bool




int main ()
{
    bool a;
    a = 98;
    return 0;
}




$ gcc-8 -v -save-temps undef2.c
Using built-in specs.
COLLECT_GCC=gcc-8
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/8/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
8.2.0-1ubuntu2~18.04' --with-bugurl=file:///usr/share/doc/gcc-8/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-8
--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 --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=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 --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 8.2.0 (Ubuntu 8.2.0-1ubuntu2~18.04) 
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -E -quiet -v -imultiarch x86_64-linux-gnu
undef2.c -mtune=generic -march=x86-64 -fpch-preprocess -fstack-protector-strong
-Wformat -Wformat-security -o undef2.i
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/8/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-linux-gnu/8/include
 /usr/local/include
 /usr/lib/gcc/x86_64-linux-gnu/8/include-fixed
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/8/cc1 -fpreprocessed undef2.i -quiet -dumpbase
undef2.c -mtune=generic -march=x86-64 -auxbase undef2 -version
-fstack-protector-strong -Wformat -Wformat-security -o undef2.s
GNU C17 (Ubuntu 8.2.0-1ubuntu2~18.04) version 8.2.0 (x86_64-linux-gnu)
        compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C17 (Ubuntu 8.2.0-1ubuntu2~18.04) version 8.2.0 (x86_64-linux-gnu)
        compiled by GNU C version 8.2.0, GMP version 6.1.2, MPFR version 4.0.1,
MPC version 1.1.0, isl version isl-0.19-GMP

GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 465f91519bea3044f6e4e12330b25007
undef2.c: In function ‘main’:
undef2.c:4:5: error: unknown type name ‘bool’; did you mean ‘_Bool’?
     bool a;
     ^~~~
     _Bool