# This is the source.sh script. It is executed by BPM in a temporary directory when compiling a source package
# BPM Expects the source code to be extracted into the automatically created 'source' directory which can be accessed using $BPM_SOURCE
# BPM Expects the output files to be present in the automatically created 'output' directory which can be accessed using $BPM_OUTPUT

# The prepare function is executed in the root of the temp directory
# This function is used for putting downloaded files to the correct location or applying patches
prepare() {
  cd "$BPM_SOURCE"
  # Fix building with glibc-2.43
  sed -i 's/char [*]q/const &/' libgomp/affinity-fmt.c
  # Install libraries to /usr/lib instead of /usr/lib64
  sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  mkdir build
  cd build
  
  ../configure --prefix=/usr             \
               --libdir=/usr/lib         \
               --libexecdir=/usr/libexec \
               --enable-default-pie      \
               --enable-default-ssp      \
               --enable-host-pie         \
               --disable-multilib        \
               --disable-fixincludes     \
               --disable-libssp          \
               --with-system-zlib        \
               --enable-languages=c,c++,fortran,objc,obj-c++,m2
  make
}

# The check function is executed in the source directory
# This function is used to run tests to verify the package has been compiled correctly
check() {
  cd build

  # Some tests are expected to fail. '|| true' will prevent the script from exiting if those fail
  make -k check || true

  # Get test results
  "$BPM_SOURCE"/contrib/test_summary
}

_pick() {
  local p="$1" f d; shift
  for f; do
    [ -d "$BPM_WORKDIR"/output_"$p" ] || { echo "Split package $p not found"; exit 1; } 
    d="$BPM_WORKDIR"/output_"$p"/"${f#$BPM_OUTPUT}"
    mkdir -p "$(dirname "$d")"
    mv "$f" "$d"
    rmdir -p --ignore-fail-on-non-empty "$(dirname "$f")"
  done
}

# The package function is executed in the source directory
# This function is used to move the compiled files into the output directory
package_gcc() {
  cd build
  
  make DESTDIR="$BPM_OUTPUT" install

  # Symlink required by FHS
  ln -sr /usr/bin/cpp "$BPM_OUTPUT"/usr/lib

  # Create 'cc' symlinks which is required by some packages
  ln -s gcc "$BPM_OUTPUT"/usr/bin/cc
  ln -s gcc.1 "$BPM_OUTPUT"/usr/share/man/man1/cc.1

  # Compatibility symlink to enable building programs with Link Time Optimizations (LTO)
  mkdir -p "$BPM_OUTPUT"/usr/lib/bfd-plugins/
  ln -sf ../../libexec/gcc/$(gcc -dumpmachine)/${BPM_PKG_VERSION}/liblto_plugin.so "$BPM_OUTPUT"/usr/lib/bfd-plugins/

  # Move misplaced files
  install -dm755 "$BPM_OUTPUT"/usr/share/gdb/auto-load/usr/lib
  mv "$BPM_OUTPUT"/usr/lib/*gdb.py "$BPM_OUTPUT"/usr/share/gdb/auto-load/usr/lib

  cd "$BPM_OUTPUT"

  # Move runtime libraries into split package
  for lib in libasan libatomic libgcc_s libgfortran libgomp libitm liblsan libobjc libquadmath libstdc++ libtsan libubsan; do
    _pick gcc-libs usr/lib/"$lib"*
  done
  _pick gcc-libs usr/share/info/{libgomp,libitm,libquadmath}.info
  _pick gcc-libs usr/share/locale/de/LC_MESSAGES/libstdc++.mo
  _pick gcc-libs usr/share/locale/fr/LC_MESSAGES/libstdc++.mo

  # Move fortran files to gcc-fortran package
  _pick gcc-libs usr/bin/{gfortran,x86_64-pc-linux-gnu-gfortran}
  _pick gcc-libs usr/lib/gcc/x86_64-pc-linux-gnu/${BPM_PKG_VERSION}/{finclude,libcaf_single.a}
  _pick gcc-libs usr/lib/gcc/x86_64-pc-linux-gnu/${BPM_PKG_VERSION}/include/ISO_Fortran_binding.h
  _pick gcc-libs usr/libexec/gcc/x86_64-pc-linux-gnu/${BPM_PKG_VERSION}/f951
  _pick gcc-libs usr/share/info/gfortran.info
  _pick gcc-libs usr/share/man/man1/gfortran.1
  
  # Install package license
  install -Dm644 "$BPM_SOURCE"/COPYING{,3}{,.LIB} -t "$BPM_OUTPUT"/usr/share/licenses/gcc/
}

package_gcc-libs() {
  # Install package license
  install -Dm644 "$BPM_SOURCE"/{COPYING3,COPYING.RUNTIME} -t "$BPM_OUTPUT"/usr/share/licenses/gcc-libs/
}

package_gcc-fortran() {
  # Install package license
  install -Dm644 "$BPM_SOURCE"/{COPYING3,COPYING.RUNTIME} -t "$BPM_OUTPUT"/usr/share/licenses/gcc-fortran/
}