# SPDX-FileCopyrightText: 2021 Andrius Štikonas <andrius@stikonas.eu>
# SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
# SPDX-FileCopyrightText: 2021-23 Samuel Tyler <samuel@samuelt.me>

# SPDX-License-Identifier: GPL-3.0-or-later

src_prepare() {
    default

    # Generated using gperf
    rm gcc/cp/cfns.h

    # Regenerating top level Makefile requires GNU Autogen and hence Guile,
    # but it is not essential for building gcc.
    rm configure Makefile.in fixincludes/fixincl.x

    # Remove unused generated files
    rm libgo/aclocal.m4 libgo/configure libgo/Makefile.in
    rm gcc/config/avr/t-multilib
    rm gcc/config/mep/intrinsics.h gcc/config/mep/intrinsics.md \
        gcc/config/mep/mep-intrin.h
    rm gcc/config/arm/arm_neon.h
    rm gcc/testsuite/gcc.target/x86_64/abi/test_passing_integers.c \
        gcc/testsuite/gcc.target/x86_64/abi/test_3_element_struct_and_unions.c \
        gcc/testsuite/gcc.target/x86_64/abi/test_passing_floats.c \
        gcc/testsuite/gcc.target/x86_64/abi/test_basic_returning.c
    rm gcc/testsuite/go.test/test/bench/go1/jsondata_test.go \
        gcc/testsuite/go.test/test/bench/shootout/mandelbrot.txt
    rm gcc/testsuite/go.test/test/cmplxdivide1.go
    find zlib -name "*.obj" -delete
    rm zlib/contrib/puff/zeros.raw zlib/contrib/blast/test.pk \
        zlib/contrib/dotzlib/DotZLib.chm
    find libjava -name "*.class" -delete
    find libjava -type f -name "*.jar" -delete
    find libjava -name "*.h" -exec grep -l "DO NOT EDIT THIS FILE" {} \; | xargs rm
    rm libjava/classpath/gnu/java/lang/CharData.java \
        libjava/classpath/gnu/java/rmi/dgc/DGCImpl_Skel.java \
        libjava/classpath/gnu/java/rmi/dgc/DGCImpl_Stub.java \
        libjava/classpath/gnu/java/rmi/registry/RegistryImpl_Skel.java \
        libjava/classpath/gnu/java/rmi/registry/RegistryImpl_Stub.java
    rm libjava/classpath/resource/gnu/java/locale/*.properties \
        libjava/classpath/resource/java/text/*.properties \
        libjava/classpath/resource/java/util/*.properties
    rm libjava/include/java-chardecomp.h \
        libjava/include/java-chartables.h
    rm -r libjava/testsuite/libjava.cni \
        libjava/testsuite/libjava.jvmti
    rm boehm-gc/MacProjects.sit.hqx
    find fixincludes/tests -name "*.h" -delete
    find . -name "*.pdf" -delete
    rm -r libstdc++-v3/doc/html
    rm libgfortran/generated/*.F90
    rm -r libgo/go/debug/elf/testdata \
        libgo/go/debug/macho/testdata \
        libgo/go/debug/pe/testdata \
        libgo/go/debug/dwarf/testdata
    rm libgo/go/regexp/syntax/perl_groups.go
    rm libgo/go/strconv/isprint.go

    # Regenerating these would require TCL
    rm libjava/sources.am libjava/Makefile.in

    # Part generated, part human-written, but unused
    rm libgcc/config/sh/lib1funcs.S libgcc/config/sh/lib1funcs-4-300.S
    rm libjava/classpath/java/util/TimeZone.java
    rm libjava/gcj/javaprims.h

    # xz-style blobs
    rm boehm-gc/cord/de_win.ICO

    # Regenerate aclocal.m4 files
    # grep "generated automatically by aclocal" */aclocal.m4  -l | sed -e 's#/aclocal.m4##'  | tr "\n" " " | sed -e 's/ $/\n/'
    for dir in intl libcpp libdecnumber; do
        cd $dir
        rm aclocal.m4
        AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 aclocal-1.11 --acdir=../config
        cd ..
    done
    cd gcc
    rm aclocal.m4
    AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 aclocal-1.11 --acdir=../config
    cd ..
    cd fixincludes
    rm aclocal.m4
    AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 aclocal-1.11 --acdir=../gcc
    cd ..
    for dir in boehm-gc libffi libgfortran libgomp libitm libjava libmudflap libobjc libquadmath libssp lto-plugin zlib libjava/classpath libjava/libltdl; do
        pushd "$dir"
        rm aclocal.m4
        AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 aclocal-1.11
        popd
    done

    cd libstdc++-v3
    ACLOCAL=aclocal-1.11 AUTOMAKE=automake-1.11 AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 autoreconf-2.64 -fi
    cd ..

    # Regenerate configure scripts
    # Find all folders with configure script and rebuild them. At the moment we exclude boehm-gc folder due to
    # an error but we don't use that directory anyway (it's only needed for Objective C)
    for dir in $(find . -mindepth 2 -maxdepth 2 -name configure.ac | sed 's#/configure.ac##' | grep -v -x './libgo' | tr "\n" " " | sed -e 's/ $/\n/' -e 's/^boehm-gc //'); do
        pushd "$dir"
        rm configure
        autoconf-2.64 || autoconf-2.64
        popd
    done

    # Regenerate Makefile.in
    # Find all folders with Makefile.am and rebuild them. At the moment we exclude boehm-gc folder.
    for dir in $(find . -mindepth 2 -maxdepth 2 -name Makefile.am | sed 's#/Makefile.am##' | grep -v -x -e './libgo' -e './libjava' | tr "\n" " " | sed -e 's/ $/\n/' -e 's/^boehm-gc //'); do
        pushd "$dir"
        rm Makefile.in
        AUTOCONF=autoconf-2.64 AUTOM4TE=autom4te-2.64 automake-1.11 --add-missing
        popd
    done

    for dir in libdecnumber libcpp libiberty gcc; do
        cd $dir
        rm -f config.in
        autoheader-2.64
        cd ..
    done

    # Rebuild dependencies in libiberty/Makefile.in
    pushd libiberty
    ./configure --enable-maintainer-mode
    make maint-deps
    popd

    # Rebuild libtool files
    rm config.guess config.sub ltmain.sh
    rm libjava/libltdl/missing
    libtoolize -i
    cp "${PREFIX}/share/automake-1.15/config.sub" .
    for dir in libjava/libltdl libjava/classpath libgo/config; do
        pushd "$dir"
        libtoolize -i
        popd
    done

    # Workaround for bison being too new
    rm intl/plural.c

    # Rebuild flex generated files
    rm gcc/gengtype-lex.c

    # Regenerate crc table in libiberty/crc32.c
    pushd libiberty
    sed -n '/^   #include <stdio.h>/,/^   \}$/p' crc32.c > crcgen.c
    gcc -o crcgen crcgen.c
    sed '/crc_v3\.txt/{n; q}' crc32.c > crc32.c.new
    ./crcgen >> crc32.c.new
    sed '1,/^};$/d' crc32.c >> crc32.c.new
    mv crc32.c.new crc32.c
    popd

    # Regenerate decDPD.h
    rm libdecnumber/decDPD.h
    gcc -std=c99 -o decDPD_generate decDPD_generate.c
    cp decDPD.h.preamble libdecnumber/decDPD.h
    ./decDPD_generate >> libdecnumber/decDPD.h

    # Remove translation catalogs
    find . -name '*.gmo' -delete

    # Pre-built texinfo files
    rm libiberty/functions.texi
    find . -name '*.info' -delete

    # Pre-built manpages
    find . -name '*.[1-9]' -delete
}

src_configure() {
    mkdir build
    cd build

    for dir in libiberty libcpp libdecnumber gcc libgcc libstdc++-v3; do
        mkdir $dir
        cd $dir
        ../../$dir/configure \
            --prefix="${PREFIX}" \
            --libdir="${LIBDIR}" \
            --build="${TARGET}" \
            --target="${TARGET}" \
            --host="${TARGET}" \
            --disable-shared \
            --program-transform-name= \
            --enable-languages=c,c++ \
            --disable-sjlj-exceptions \
            --with-system-zlib
        cd ..
    done
    cd ..
}

src_compile() {
    ln -s . "build/build-${TARGET}"
    for dir in libiberty libcpp libdecnumber gcc; do
        make "${MAKEJOBS}" -C build/$dir LIBGCC2_INCLUDES=-I"${PREFIX}/include" \
            STMP_FIXINC= GMPLIBS="-lmpc -lmpfr -lgmp" MAKEINFO=true
    done

    # host_subdir is necessary because we have slightly different build directory layout
    make "${MAKEJOBS}" -C build/libgcc PATH="${PATH}:../gcc" CC=../gcc/xgcc \
        host_subdir=build CFLAGS="-I../gcc/include -I/${PREFIX}/include"

    make "${MAKEJOBS}" -C build/libstdc++-v3 PATH="${PATH}:${PWD}/build/gcc" \
        CXXFLAGS="-I${PWD}/build/gcc/include -I ${PREFIX}/include"
}

src_install() {
    make -C build/gcc install STMP_FIXINC= DESTDIR="${DESTDIR}" MAKEINFO=true
    make -C build/libgcc install DESTDIR="${DESTDIR}" host_subdir=build
    make -C build/libstdc++-v3 install DESTDIR="${DESTDIR}"
    ln -s gcc "${DESTDIR}${PREFIX}/bin/cc"
    cp gcc/gsyslimits.h "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.7.4/include/syslimits.h"

    # Very strange mis-versoning error
    mkdir -p "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.7.4/include/"
    mv "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.0.4/include/"* "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.7.4/include/"
    rmdir "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.0.4/include"
    mv "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.0.4/"* "${DESTDIR}${LIBDIR}/gcc/${TARGET}/4.7.4/"
}