pkgname=(glibc glibc-32bit)
pkgbase=glibc
pkgver=2.40+r16+gaa533d58ff12
pkgrel=1
arch=('x86_64')
url="https://www.gnu.org/software/libc"
license=('GPL-2.0-or-later' 'LGPL-2.1-or-later')
makedepends=('git' 'gcc-libs-32bit' 'python')
options=('!staticlibs' '!lto')
source=(git+https://mirrors.tuna.tsinghua.edu.cn/git/glibc.git#commit=aa533d58ff12e27771d9c960a727d74992a3f2a3
    https://www.linuxfromscratch.org/patches/downloads/${pkgbase}/${pkgbase}-2.40-fhs-1.patch
    ld.so.conf
    nsswitch.conf)
sha256sums=(SKIP
    643552db030e2f2d7ffde4f558e0f5f83d3fabf34a2e0e56ebdb49750ac27b0d
    71315fb19572420138b2974acd8a2d836ef1f1889599775cf0361d73d9e86d6a
    e472b2ab7376bd38064a1a0549063b5fda4b71a0adac6baa881adb7416b84cb4)

pkgver() {
    cd glibc

    git describe --abbrev=12 --tags | sed 's/[^-]*-//;s/[^-]*-/&r/;s/-/+/g'
}

prepare() {
    cd glibc

    mkdir -p ${srcdir}/glibc-build ${srcdir}/glibc-build-32bit

    patch -Np1 -i ${srcdir}/${pkgbase}-2.40-fhs-1.patch
}
build() {

    local _configure_flags=(
        --prefix=/usr
        --with-headers=/usr/include
        --enable-bind-now
        --enable-fortify-source
        --enable-kernel=5.4
        --enable-multi-arch
        --enable-stack-protector=strong
        --disable-nscd
        --disable-profile
        --disable-werror
    )

    # _FORTIFY_SOURCE=3 causes testsuite build failure and is unnecessary during
    # actual builds (support is built-in via --enable-fortify-source).
    CFLAGS=${CFLAGS/-Wp,-D_FORTIFY_SOURCE=3/}

    (
        cd glibc-build

        echo "rootsbindir=/usr/sbin" >> configparms
        echo "complocaledir=/usr/lib/locale" >> configparms

        ${srcdir}/glibc/configure      \
            --libdir=/usr/lib64        \
            --enable-cet               \
            libc_cv_slibdir=/usr/lib64 \
            "${_configure_flags[@]}"

        make -O

        # build info pages manually for reproducibility
        make info
    )

    (
    cd glibc-build-32bit

    export CC="gcc -m32 -mstackrealign"
    export CXX="g++ -m32 -mstackrealign"

    # remove frame pointer flags due to crashes of nvidia driver on steam starts
    # See https://gitlab.archlinux.org/archlinux/packaging/packages/glibc/-/issues/10
    CFLAGS=${CFLAGS/-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer/}

    echo "rootsbindir=/usr/sbin" >> configparms
    echo "complocaledir=/usr/lib/locale" >> configparms

    ${srcdir}/glibc/configure       \
        --host=i686-pc-linux-gnu    \
        --libdir=/usr/lib32         \
        --libexecdir=/usr/lib32     \
        libc_cv_slibdir=/usr/lib32  \
        "${_configure_flags[@]}"

    make -O
    )
}

package_glibc() {
    pkgdesc='GNU C Library'
    depends=('linux-api-headers' 'tzdata' 'filesystem')
    install=glibc.install
    backup=(etc/nsswitch.conf
        etc/ld.so.conf)

    cd glibc-build

    make DESTDIR=${pkgdir} install

    install -dm755 ${pkgdir}/usr/lib/locale
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i C -f UTF-8 C.UTF-8
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i en_US -f ISO-8859-1 en_US
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i en_US -f UTF-8 en_US.UTF-8
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i zh_CN -f GB18030 zh_CN.GB18030
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i zh_CN -f GBK zh_CN.GBK
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i zh_CN -f UTF-8 zh_CN.UTF-8
    ${pkgdir}/usr/bin/localedef --prefix=${pkgdir} -i zh_CN -f GB2312 zh_CN.GB2312

    install -vm644 ${srcdir}/nsswitch.conf ${pkgdir}/etc/
    install -vm644 ${srcdir}/ld.so.conf ${pkgdir}/etc/

    install -vdm755 ${pkgdir}/etc/ld.so.conf.d
}

package_glibc-32bit() {
    pkgdesc="GNU C Library (32-bit)"
    depends=("glibc=${pkgver}")
    options+=('!emptydirs')
    install=glibc-32bit.install

    cd glibc-build-32bit

    make DESTDIR=$PWD/DESTDIR install

    install -vdm755 ${pkgdir}/usr/lib{32,64}
    ln -sv usr/lib32 ${pkgdir}/lib32

    cp -a DESTDIR/usr/lib32/* ${pkgdir}/usr/lib32/

    install -vDm644 DESTDIR/usr/include/gnu/{lib-names,stubs}-32.h -t ${pkgdir}/usr/include/gnu/

    install -vdm755 ${pkgdir}/etc/ld.so.conf.d
    echo "/usr/lib32" >> ${pkgdir}/etc/ld.so.conf.d/glibc-32bit.conf

    ln -svf ../lib32/ld-linux.so.2 ${pkgdir}/usr/lib64/ld-linux.so.2

}