# 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

DOWNLOAD="https://ftpmirror.gnu.org/gcc/gcc-${BPM_PKG_VERSION}/gcc-${BPM_PKG_VERSION}.tar.xz"
FILENAME="${DOWNLOAD##*/}"

# The prepare function is executed in the root of the temp directory
# This function is used for downloading files and putting them into the correct location
prepare() {
  wget "$DOWNLOAD"
  tar -xvf "$FILENAME" --strip-components=1 -C "$BPM_SOURCE"
}

# The build function is executed in the source directory
# This function is used to compile the source code
build() {
  # Install libraries to /usr/lib instead of /usr/lib64
  sed -e '/m64=/s/lib64/lib/' -i.orig gcc/config/i386/t-linux64
  
  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-bootstrap       \
               --disable-fixincludes     \
               --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
}

# 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

  # Move runtime libraries to gcc-libs package
  mkdir "$BPM_SOURCE"/output-gcc-libs
  install -d "$BPM_SOURCE"/output-gcc-libs/usr/lib
  install -d "$BPM_SOURCE"/output-gcc-libs/usr/share/{info,locale/de/LC_MESSAGES,locale/fr/LC_MESSAGES}
  for lib in libasan libatomic libgcc_s libgfortran libgomp libitm liblsan libobjc libquadmath libstdc++ libtsan libubsan; do
    mv "$BPM_OUTPUT"/usr/lib/"$lib"* -t "$BPM_SOURCE"/output-gcc-libs/usr/lib/
  done
  mv "$BPM_OUTPUT"/usr/share/info/{libgomp,libitm,libquadmath}.info -t "$BPM_SOURCE"/output-gcc-libs/usr/share/info/
  mv "$BPM_OUTPUT"/usr/share/locale/de/LC_MESSAGES/libstdc++.mo -t "$BPM_SOURCE"/output-gcc-libs/usr/share/locale/de/LC_MESSAGES/
  mv "$BPM_OUTPUT"/usr/share/locale/fr/LC_MESSAGES/libstdc++.mo -t "$BPM_SOURCE"/output-gcc-libs/usr/share/locale/fr/LC_MESSAGES/

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

package_gcc-libs() {
  # Replace 'output' directory with 'output-gcc-libs'
  rmdir "$BPM_OUTPUT"
  mv "$BPM_SOURCE"/output-gcc-libs "$BPM_OUTPUT"

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

package_gcc-fortran() {
  # Replace 'output' directory with 'output-gcc-fortran'
  rmdir "$BPM_OUTPUT"
  mv "$BPM_SOURCE"/output-gcc-fortran "$BPM_OUTPUT"
  
  # Install package license
  install -Dm644 "$BPM_SOURCE"/{COPYING3,COPYING.RUNTIME} -t "$BPM_OUTPUT"/usr/share/licenses/gcc-fortran/
}