#! /bin/bash

# Get the last commit which may change libbfd.so and libopcodes.so ABIs.
last_abi_commit=$1

if test -z "$last_abi_commit"; then
  last_abi_commit=$(git log bfd/version.h | head -1 | awk '{ print $2 }')
fi

# The list of files and directories which may change the ABI.
abi_files="
bfd
opcodes
include/bfdlink.h
include/dis-asm.h
include/plugin-api.h
"

# Get the list of files changed since the last commit which may change
# the ABI.
abi_files_changed=$(git --no-pager diff --stat=4096 $last_abi_commit $abi_files \
| awk '/files changed/ { next }; \
       /ChangeLog.*/ { next }; \
       /version.h/ { next }; \
       /version.m4/ { next }; \
       /\/doc\// { next }; \
       /\/po\// { next }; \
       { print $1 }')

if test -z "$abi_files_changed"; then
  echo No ABI change since commit:
  echo
  git --no-pager log -1 --oneline $last_abi_commit
  echo
  exit 1
else
  echo The following files are changed since commit:
  echo
  git --no-pager log -1 --oneline $last_abi_commit
  echo
  for f in $abi_files_changed; do
    echo "  $f"
  done
  echo
  echo which may change ABIs of libbfd.so and libopcodes.so
  exit 0
fi