"This version of /usr/bin/gcc does not support OpenMP OS Unsupported"

[oodler577]

See error example in this test that installs GCC 13 on Ubuntu, then toggles it to be the "system" GCC: https://github.com/Perl-OpenMP/p5-Alien-OpenMP/actions/runs/13779231639/job/38534291490#step:7:5547

This seems like it happens when the version of gcc is not originally the system gcc. I've had this happen on RHEL using gcc provided via Spack.

See runner, https://github.com/Perl-OpenMP/p5-Alien-OpenMP/blob/add-gcc-runners/.github/workflows/test-gccs.yml

See https://github.com/Perl-OpenMP/p5-Alien-OpenMP/actions/runs/13779231639

https://github.com/Perl-OpenMP/p5-Alien-OpenMP/actions/runs/13779231639/job/38534291490#step:6:7994

perl -V

Summary of my perl5 (revision 5 version 40 subversion 1) configuration:
   
  Platform:
    osname=linux
    osvers=6.8.0-1021-azure
    archname=x86_64-linux
    uname='linux fv-az1042-900 6.8.0-1021-azure #25-ubuntu smp wed jan 15 20:45:09 utc 2025 x86_64 x86_64 x86_64 gnulinux '
    config_args='-de -Dprefix=/home/runner/perl5/perlbrew/perls/perl-5.40.1 -Dcc=/usr/bin/gcc -Aeval:scriptdir=/home/runner/perl5/perlbrew/perls/perl-5.40.1/bin'
    hint=recommended
    useposix=true
    d_sigaction=define
    useithreads=undef
    usemultiplicity=undef
    use64bitint=define
    use64bitall=define
    uselongdouble=undef
    usemymalloc=n
    default_inc_excludes_dot=define
  Compiler:
    cc='/usr/bin/gcc'
    ccflags ='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64'
    optimize='-O2'
    cppflags='-fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -I/usr/local/include'
    ccversion=''
    gccversion='13.3.0'
    gccosandvers=''
    intsize=4
    longsize=8
    ptrsize=8
    doublesize=8
    byteorder=12345678
    doublekind=3
    d_longlong=define
    longlongsize=8
    d_longdbl=define
    longdblsize=16
    longdblkind=3
    ivtype='long'
    ivsize=8
    nvtype='double'
    nvsize=8
    Off_t='off_t'
    lseeksize=8
    alignbytes=8
    prototype=define
  Linker and Libraries:
    ld='/usr/bin/gcc'
    ldflags =' -fstack-protector-strong -L/usr/local/lib'
    libpth=/usr/local/lib /usr/lib/x86_64-linux-gnu /usr/lib /usr/lib64
    libs=-lpthread -ldl -lm -lcrypt -lutil -lc
    perllibs=-lpthread -ldl -lm -lcrypt -lutil -lc
    libc=/lib/x86_64-linux-gnu/libc.so.6
    so=so
    useshrplib=false
    libperl=libperl.a
    gnulibc_version='2.39'
  Dynamic Linking:
    dlsrc=dl_dlopen.xs
    dlext=so
    d_dlsymun=undef
    ccdlflags='-Wl,-E'
    cccdlflags='-fPIC'
    lddlflags='-shared -O2 -L/usr/local/lib -fstack-protector-strong'


Characteristics of this binary (from libperl): 
  Compile-time options:
    HAS_LONG_DOUBLE
    HAS_STRTOLD
    HAS_TIMES
    PERLIO_LAYERS
    PERL_COPY_ON_WRITE
    PERL_DONT_CREATE_GVSV
    PERL_HASH_FUNC_SIPHASH13
    PERL_HASH_USE_SBOX32
    PERL_MALLOC_WRAP
    PERL_OP_PARENT
    PERL_PRESERVE_IVUV
    PERL_USE_SAFE_PUTENV
    USE_64_BIT_ALL
    USE_64_BIT_INT
    USE_LARGE_FILES
    USE_LOCALE
    USE_LOCALE_COLLATE
    USE_LOCALE_CTYPE
    USE_LOCALE_NUMERIC
    USE_LOCALE_TIME
    USE_PERLIO
    USE_PERL_ATOF
  Built under linux
  Compiled at Mar 11 2025 02:48:28
  %ENV:
    PERLBREW_HOME="/home/runner/.perlbrew"
    PERLBREW_MANPATH="/home/runner/perl5/perlbrew/perls/perl-5.40.1/man"
    PERLBREW_PATH="/home/runner/perl5/perlbrew/bin:/home/runner/perl5/perlbrew/perls/perl-5.40.1/bin"
    PERLBREW_PERL="perl-5.40.1"
    PERLBREW_ROOT="/home/runner/perl5/perlbrew"
    PERLBREW_SHELLRC_VERSION="1.01"
    PERLBREW_VERSION="1.01"
  @INC:
    /home/runner/perl5/perlbrew/perls/perl-5.40.1/lib/site_perl/5.40.1/x86_64-linux
    /home/runner/perl5/perlbrew/perls/perl-5.40.1/lib/site_perl/5.40.1
    /home/runner/perl5/perlbrew/perls/perl-5.40.1/lib/5.40.1/x86_64-linux
    /home/runner/perl5/perlbrew/perls/perl-5.40.1/lib/5.40.1

[oodler577]

Done with 0.3.7