# 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://ftp.gnu.org/gnu/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-languages=c,c++  \
               --enable-default-pie      \
               --enable-default-ssp      \
               --enable-host-pie         \
               --disable-multilib        \
               --disable-bootstrap       \
               --disable-fixincludes     \
               --with-system-zlib
  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() {
  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

  # Install package license
  install -Dm644 "$BPM_SOURCE"/gcc/COPYING "$BPM_OUTPUT"/usr/share/licenses/gcc/COPYING
}