%global gcc_version        14.4.0
%global glibc_version      2.40
%global toolchain_release  2

%global custom_gcc_root    /usr/lib64/custom-gcc14
%global custom_glibc_root  /usr/lib64/custom-glibc

Name:           cuda12-toolchain
Version:        1.0
Release:        %{toolchain_release}%{?dist}
Summary:        Bootstrap GCC 14 and glibc 2.40 toolchain for CUDA 12.9

License:        GPL-3.0-or-later AND LGPL-2.1-or-later
URL:            https://gcc.gnu.org/

Source0:        https://ftp.gnu.org/gnu/gcc/gcc-%{gcc_version}/gcc-%{gcc_version}.tar.xz
Source1:        https://ftp.gnu.org/gnu/glibc/glibc-%{glibc_version}.tar.xz

ExclusiveArch:  x86_64

BuildRequires:  gcc
BuildRequires:  gcc-c++
BuildRequires:  glibc-devel
BuildRequires:  binutils
BuildRequires:  make
BuildRequires:  bison
BuildRequires:  flex
BuildRequires:  gawk
BuildRequires:  grep
BuildRequires:  sed
BuildRequires:  diffutils
BuildRequires:  findutils
BuildRequires:  python3
BuildRequires:  perl
BuildRequires:  texinfo
BuildRequires:  kernel-headers
BuildRequires:  gmp-devel
BuildRequires:  mpfr-devel
BuildRequires:  libmpc-devel
BuildRequires:  isl-devel
BuildRequires:  zlib-ng-compat-devel

%global debug_package %{nil}
%global _debugsource_packages 0

%description
Bootstrap-only source package used to build a private GCC 14.4 and
glibc 2.40 toolchain for CUDA 12.x. Installed files are emitted only
by the custom-gcc14 and custom-glibc subpackages.

%package -n custom-gcc14
Version:        %{gcc_version}
Release:        %{toolchain_release}%{?dist}
Summary:        GCC 14.4 toolchain built against private glibc 2.40
License:        GPL-3.0-or-later WITH GCC-exception-3.1
AutoProv:       no
Requires:       custom-glibc = %{glibc_version}-%{toolchain_release}%{?dist}

%description -n custom-gcc14
Private GCC 14.4 toolchain intended for CUDA 12.x.
The target runtime libraries are built against the private glibc 2.40
sysroot installed in %{custom_glibc_root}.
The compiler is installed in %{custom_gcc_root} and does not replace
the Fedora system compiler.

%package -n custom-glibc
Version:        %{glibc_version}
Release:        %{toolchain_release}%{?dist}
Summary:        Private glibc 2.40 sysroot for CUDA 12.x
License:        LGPL-2.1-or-later
AutoReqProv:    no

%description -n custom-glibc
Private GNU C Library 2.40 sysroot intended for the CUDA 12.x
compatibility toolchain.
It contains glibc headers, libraries, startup objects and Linux UAPI
headers beneath %{custom_glibc_root}.
It does not replace or modify the Fedora system glibc.

%prep
%setup -q -c -T

tar -xf %{SOURCE0}
tar -xf %{SOURCE1}

%build
set -e

TOP="$(pwd)"

GCC_SRC="${TOP}/gcc-%{gcc_version}"
GLIBC_SRC="${TOP}/glibc-%{glibc_version}"

STAGE0_GCC="${TOP}/stage0-gcc14"
STAGE1_GLIBC="${TOP}/stage1-glibc"
STAGE2_GCC="${TOP}/stage2-gcc14"
STAGE3_GLIBC="${TOP}/stage3-glibc"

GCC_BUILD0="${TOP}/build-gcc-stage0"
GLIBC_BUILD1="${TOP}/build-glibc-stage1"
GCC_BUILD2="${TOP}/build-gcc-stage2"
GLIBC_BUILD3="${TOP}/build-glibc-stage3"
GCC_BUILD4="${TOP}/build-gcc-stage4"

FINAL_GCC_ROOT="%{custom_gcc_root}"
FINAL_GLIBC_ROOT="%{custom_glibc_root}"

JOBS="$(nproc)"

# Do not inherit Fedora annobin/hardening/LTO flags into the private
# bootstrap toolchain. These conservative flags match the policy that
# made the standalone GCC/glibc builds usable.
export CFLAGS="-O2 -g"
export CXXFLAGS="-O2 -g"
export LDFLAGS=""

unset FFLAGS || :
unset FCFLAGS || :

copy_kernel_uapi()
{
    SYSROOT="$1"

    rpm -ql kernel-headers | while IFS= read -r P; do
        case "$P" in
            /usr/include/*)
                if [ -d "$P" ] && [ ! -L "$P" ]; then
                    mkdir -p "${SYSROOT}${P}"
                elif [ -e "$P" ] || [ -L "$P" ]; then
                    mkdir -p "${SYSROOT}$(dirname "$P")"
                    cp -a "$P" "${SYSROOT}${P}"
                fi
                ;;
        esac
    done
}

# ============================================================
# stage0: GCC 14 C-only + libgcc
# Fedora GCC16/glibc is used only to bootstrap the compiler.
# ============================================================

echo "=== stage0: GCC %{gcc_version} C-only bootstrap ==="

rm -rf "$GCC_BUILD0" "$STAGE0_GCC"
mkdir -p "$GCC_BUILD0" "$STAGE0_GCC"

pushd "$GCC_BUILD0"

"$GCC_SRC/configure" \
    --prefix="$STAGE0_GCC" \
    --enable-languages=c \
    --disable-bootstrap \
    --disable-multilib \
    --disable-nls

make -j"$JOBS" all-gcc
make -j"$JOBS" all-target-libgcc

make install-gcc
make install-target-libgcc

popd

test -x "$STAGE0_GCC/bin/gcc"
"$STAGE0_GCC/bin/gcc" --version

# ============================================================
# stage1: first glibc 2.40 built by stage0 GCC14
# ============================================================

echo "=== stage1: glibc %{glibc_version} bootstrap ==="

rm -rf "$GLIBC_BUILD1" "$STAGE1_GLIBC"
mkdir -p "$GLIBC_BUILD1" "$STAGE1_GLIBC"

pushd "$GLIBC_BUILD1"

CC="$STAGE0_GCC/bin/gcc" \
BUILD_CC=/usr/bin/gcc \
CFLAGS="-O2 -g" \
LDFLAGS="" \
"$GLIBC_SRC/configure" \
    --prefix=/usr \
    --libdir=/usr/lib64 \
    --includedir=/usr/include \
    --disable-werror

make -j"$JOBS"
make install install_root="$STAGE1_GLIBC"

popd

copy_kernel_uapi "$STAGE1_GLIBC"

rm -f "$STAGE1_GLIBC/etc/ld.so.cache"
rm -f "$STAGE1_GLIBC/etc/ld.so.conf"

test -f "$STAGE1_GLIBC/usr/include/features.h"
test -f "$STAGE1_GLIBC/usr/include/linux/limits.h"
test -e "$STAGE1_GLIBC/lib64/libc.so.6"
test -e "$STAGE1_GLIBC/lib64/ld-linux-x86-64.so.2"
test -f "$STAGE1_GLIBC/usr/lib64/crt1.o"
test -f "$STAGE1_GLIBC/usr/lib64/crti.o"
test -f "$STAGE1_GLIBC/usr/lib64/crtn.o"

# ============================================================
# stage2: first complete GCC14 against stage1 glibc 2.40
# ============================================================

echo "=== stage2: complete GCC %{gcc_version} ==="

rm -rf "$GCC_BUILD2" "$STAGE2_GCC"
mkdir -p "$GCC_BUILD2" "$STAGE2_GCC"

pushd "$GCC_BUILD2"

CC=/usr/bin/gcc \
CXX=/usr/bin/g++ \
CFLAGS="-O2 -g" \
CXXFLAGS="-O2 -g" \
LDFLAGS="" \
"$GCC_SRC/configure" \
    --prefix="$STAGE2_GCC" \
    --with-sysroot="$FINAL_GLIBC_ROOT" \
    --with-build-sysroot="$STAGE1_GLIBC" \
    --with-native-system-header-dir=/usr/include \
    --with-glibc-version=%{glibc_version} \
    --enable-languages=c,c++ \
    --disable-bootstrap \
    --disable-multilib \
    --disable-nls

make -j"$JOBS" \
    CFLAGS_FOR_TARGET="-O2 -g" \
    CXXFLAGS_FOR_TARGET="-O2 -g" \
    LDFLAGS_FOR_TARGET=""

make install

popd

test -x "$STAGE2_GCC/bin/gcc"
test -x "$STAGE2_GCC/bin/g++"

"$STAGE2_GCC/bin/gcc" --version
"$STAGE2_GCC/bin/g++" --version

# ============================================================
# stage3: rebuild glibc 2.40 with complete stage2 GCC14
# ============================================================

echo "=== stage3: final glibc %{glibc_version} ==="

rm -rf "$GLIBC_BUILD3" "$STAGE3_GLIBC"
mkdir -p "$GLIBC_BUILD3" "$STAGE3_GLIBC"

pushd "$GLIBC_BUILD3"

CC="$STAGE2_GCC/bin/gcc --sysroot=$STAGE1_GLIBC -B$STAGE1_GLIBC/usr/lib64/" \
BUILD_CC=/usr/bin/gcc \
CFLAGS="-O2 -g" \
LDFLAGS="" \
"$GLIBC_SRC/configure" \
    --prefix=/usr \
    --libdir=/usr/lib64 \
    --includedir=/usr/include \
    --disable-werror

make -j"$JOBS"
make install install_root="$STAGE3_GLIBC"

popd

copy_kernel_uapi "$STAGE3_GLIBC"

rm -f "$STAGE3_GLIBC/etc/ld.so.cache"
rm -f "$STAGE3_GLIBC/etc/ld.so.conf"

test -f "$STAGE3_GLIBC/usr/include/features.h"
test -f "$STAGE3_GLIBC/usr/include/linux/limits.h"
test -e "$STAGE3_GLIBC/lib64/libc.so.6"
test -e "$STAGE3_GLIBC/lib64/ld-linux-x86-64.so.2"
test -f "$STAGE3_GLIBC/usr/lib64/crt1.o"
test -f "$STAGE3_GLIBC/usr/lib64/crti.o"
test -f "$STAGE3_GLIBC/usr/lib64/crtn.o"

# ============================================================
# stage4: final GCC14 against stage3 glibc 2.40
#
# stage2 GCC builds host-side GCC programs against the Fedora host
# (--sysroot=/), while target libraries use stage3 through
# --with-build-sysroot.
# ============================================================

echo "=== stage4: final GCC %{gcc_version} ==="

rm -rf "$GCC_BUILD4"
mkdir -p "$GCC_BUILD4"

pushd "$GCC_BUILD4"

CC="$STAGE2_GCC/bin/gcc --sysroot=/" \
CXX="$STAGE2_GCC/bin/g++ --sysroot=/" \
CFLAGS="-O2 -g" \
CXXFLAGS="-O2 -g" \
LDFLAGS="" \
"$GCC_SRC/configure" \
    --prefix="$FINAL_GCC_ROOT" \
    --with-sysroot="$FINAL_GLIBC_ROOT" \
    --with-build-sysroot="$STAGE3_GLIBC" \
    --with-native-system-header-dir=/usr/include \
    --with-glibc-version=%{glibc_version} \
    --enable-languages=c,c++ \
    --disable-bootstrap \
    --disable-multilib \
    --disable-nls

make -j"$JOBS" \
    CFLAGS_FOR_TARGET="-O2 -g" \
    CXXFLAGS_FOR_TARGET="-O2 -g" \
    LDFLAGS_FOR_TARGET=""

popd

%install
set -e

# RPM 6 uses a *-build directory; use the actual section working
# directory rather than reconstructing it from %{_builddir}.
TOP="$(pwd)"

STAGE3_GLIBC="${TOP}/stage3-glibc"
GCC_BUILD4="${TOP}/build-gcc-stage4"

rm -rf %{buildroot}%{custom_gcc_root}
rm -rf %{buildroot}%{custom_glibc_root}
rm -rf %{buildroot}%{_libexecdir}/custom-gcc14

mkdir -p %{buildroot}%{custom_glibc_root}

cp -a "$STAGE3_GLIBC"/. %{buildroot}%{custom_glibc_root}/

pushd "$GCC_BUILD4"
make install DESTDIR=%{buildroot}
popd

mkdir -p %{buildroot}%{_libexecdir}/custom-gcc14

cat > %{buildroot}%{_libexecdir}/custom-gcc14/env.sh <<'EOF'
CUSTOM_GCC14_ROOT=/usr/lib64/custom-gcc14
CUSTOM_GLIBC_ROOT=/usr/lib64/custom-glibc

export CUSTOM_GCC14_ROOT
export CUSTOM_GLIBC_ROOT

export CC="${CUSTOM_GCC14_ROOT}/bin/gcc"
export CXX="${CUSTOM_GCC14_ROOT}/bin/g++"
export PATH="${CUSTOM_GCC14_ROOT}/bin:${PATH}"
EOF

chmod 0755 %{buildroot}%{_libexecdir}/custom-gcc14/env.sh

rm -f %{buildroot}%{custom_glibc_root}/etc/ld.so.cache
rm -f %{buildroot}%{custom_glibc_root}/etc/ld.so.conf

%check
test -f %{buildroot}%{custom_glibc_root}/usr/include/features.h
test -f %{buildroot}%{custom_glibc_root}/usr/include/linux/limits.h

test -e %{buildroot}%{custom_glibc_root}/lib64/libc.so.6
test -e %{buildroot}%{custom_glibc_root}/lib64/ld-linux-x86-64.so.2

test -f %{buildroot}%{custom_glibc_root}/usr/lib64/crt1.o
test -f %{buildroot}%{custom_glibc_root}/usr/lib64/crti.o
test -f %{buildroot}%{custom_glibc_root}/usr/lib64/crtn.o

test -x %{buildroot}%{custom_gcc_root}/bin/gcc
test -x %{buildroot}%{custom_gcc_root}/bin/g++

%{buildroot}%{custom_gcc_root}/bin/gcc --version
%{buildroot}%{custom_gcc_root}/bin/g++ --version

test "$(%{buildroot}%{custom_gcc_root}/bin/gcc -print-sysroot)" = "%{custom_glibc_root}"

CRT1="$(
    %{buildroot}%{custom_gcc_root}/bin/gcc \
        --sysroot=%{buildroot}%{custom_glibc_root} \
        -B%{buildroot}%{custom_glibc_root}/usr/lib64/ \
        -print-file-name=crt1.o
)"

echo "crt1.o resolved as: $CRT1"

test "$CRT1" != "crt1.o"
test -f "$CRT1"

%files -n custom-gcc14
%{custom_gcc_root}
%{_libexecdir}/custom-gcc14

%files -n custom-glibc
%{custom_glibc_root}

%changelog
* Tue Sep 15 2026 Moacyr Prado <builder@localhost> - 1.0-2
- Align build dependencies with previously working GCC14 build
- Remove invalid zstd-devel dependency
- Add main package description
- Preserve conservative bootstrap flags
- Use actual RPM build working directory during install
- Bootstrap GCC14 C-only, glibc 2.40, complete GCC14, final glibc and final GCC14

* Tue Sep 15 2026 Moacyr Prado <builder@localhost> - 1.0-1
- Initial unified CUDA 12 compatibility toolchain bootstrap