Name:           compat-gcc12
Version:        12.3.0
Release:        1%{?dist}
Summary:        GCC 12 toolset (C/C++) installed under /opt/gcc-12 with -12 suffix

License:        GPL-3.0-or-later AND GPL-2.0-or-later AND LGPL-2.1-or-later
URL:            https://gcc.gnu.org/
Source0:        https://ftp.gnu.org/gnu/gcc/gcc-%{version}/gcc-%{version}.tar.xz

Patch0:         gcc12-format-security.patch

BuildRequires:  bison
BuildRequires:  flex
BuildRequires:  gmp-devel
BuildRequires:  mpfr-devel
BuildRequires:  libmpc-devel
BuildRequires:  zlib-devel
BuildRequires:  isl-devel
BuildRequires:  make
BuildRequires:  gcc
BuildRequires:  gcc-c++
BuildRequires:  binutils
BuildRequires:  texinfo

%global _installdir /opt/gcc-12

%description
GCC 12 (C and C++) toolset installed in %{_installdir} with program suffix -12,
to allow side-by-side usage with the system GCC on Fedora 43 and similar.

%package c++
Summary:        C++ front-end for compat-gcc12
Requires:       %{name} = %{version}-%{release}

%description c++
C++ front-end (g++-12) and libstdc++ includes for the toolset.

%package libstdc++-devel
Summary:        libstdc++ headers and devel files for compat-gcc12
Requires:       %{name}-c++ = %{version}-%{release}

%description libstdc++-devel
Headers and development files from libstdc++ of GCC 12, kept under %{_installdir}.

%prep
%setup -q -n gcc-%{version}
%patch -P 0 -p1

%build
mkdir build && cd build
../configure \
  --prefix=%{_installdir} \
  --program-suffix=-12 \
  --enable-languages=c,c++ \
  --disable-multilib \
  --disable-bootstrap \
  --disable-libsanitizer \
  --disable-werror \
  --with-system-zlib
make -j%{?_smp_build_ncpus:%{_smp_build_ncpus}} || make

%install
rm -rf %{buildroot}
cd build
make install DESTDIR=%{buildroot}

install -d %{buildroot}%{_sysconfdir}/profile.d
cat > %{buildroot}%{_sysconfdir}/profile.d/compat-gcc12.sh <<'EOF'
# Enable compat-gcc12
export PATH=/opt/gcc-12/bin:$PATH
export CPATH=/opt/gcc-12/include:$CPATH
export LIBRARY_PATH=/opt/gcc-12/lib64:$LIBRARY_PATH
export LD_LIBRARY_PATH=/opt/gcc-12/lib64:$LD_LIBRARY_PATH
EOF
chmod 0644 %{buildroot}%{_sysconfdir}/profile.d/compat-gcc12.sh

%files
%license COPYING* gcc/COPYING*
%dir %{_installdir}
%{_installdir}/bin/gcc-12
%{_installdir}/bin/cpp-12
%{_installdir}/libexec/gcc/*
%config(noreplace) %{_sysconfdir}/profile.d/compat-gcc12.sh

%files c++
%{_installdir}/bin/g++-12

%files libstdc++-devel
%{_installdir}/include/c++/*

%changelog
* Tue Nov 04 2025 You <you@example.com> - 12.3.0-1
- Initial compat-gcc12 toolset for Fedora 43