#!/bin/bash -ex
#
# Copyright 2019 Google Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Regenerate host configuration files for the current host

cd `dirname ${BASH_SOURCE[0]}`

ANDROID_BUILD_TOP=$(cd ../..; pwd)

UNAME=$(uname | tr 'A-Z' 'a-z')
NAME=linux_glibc
TARGET=glibc
config_opts=()
if [ $UNAME == "darwin" ]; then
  NAME=darwin
  TARGET=darwin
  # vfork is deprecated on Mac, so always fallback to fork
  config_opts+=("ac_cv_func_vfork=no")
  # we'd need to link to libiconv
  config_opts+=("am_cv_func_iconv=no")
else
  export CC="$ANDROID_BUILD_TOP/prebuilts/clang/host/linux-x86/$(cd $ANDROID_BUILD_TOP; build/soong/scripts/get_clang_version.py)/bin/clang"
fi

if [ "$1" = "--musl" ]; then
  NAME=linux_musl
  TARGET=musl
  sysroot="${ANDROID_BUILD_TOP}/prebuilts/build-tools/sysroots/x86_64-linux-musl"
  export CFLAGS="--sysroot=${sysroot} -target x86_64-linux-musl -fuse-ld=lld"
  export LDFLAGS="--rtlib=compiler-rt"
fi

if [ $NAME == "linux_glibc" ]; then
  export CFLAGS="--sysroot=$ANDROID_BUILD_TOP/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8/sysroot"
  export LDFLAGS="--sysroot=$ANDROID_BUILD_TOP/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8/sysroot -B$ANDROID_BUILD_TOP/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8/lib/gcc/x86_64-linux/4.8.3 -L$ANDROID_BUILD_TOP/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8/lib/gcc/x86_64-linux/4.8.3 -L$ANDROID_BUILD_TOP/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.17-4.8/x86_64-linux/lib64"
fi

DIR=$NAME-lib
mkdir -p $DIR
cd $DIR


rm -rf tmp
mkdir tmp
cd tmp
../../configure \
  --disable-nls \
  --enable-relocatable \
  --prefix=/nonexistent \
  --exec-prefix=/nonexistent/$NAME-x86 \
  --datarootdir=/nonexistent/common \
  "${config_opts[@]}"

# Don't try to use aclocal/automake/etc
touch ../../aclocal.m4
touch ../../configure
touch ../../Makefile.in

# Don't attempt to update source timestamps
touch ../../doc/stamp-vti

make -fMakefile Makefile
echo 'gensrcs: $(BUILT_SOURCES)' >>Makefile
make -fMakefile gensrcs
make -fMakefile src/bison

mkdir -p ../malloc
rm -rf ../*.h ../malloc/*.h
mv lib/*.h ../
mv lib/malloc/*.h ../malloc/

GENBP=../Android.bp
rm -f $GENBP
cat >$GENBP <<END
// Autogenerated by android_regen.sh

cc_defaults {
    name: "libbison_${NAME}_defaults",
    target: {
        $TARGET: {
            srcs: [
                $(find lib -name '*.o' | sed "s/libbison_a-//" | sed -E "s/(.*)\.o/\"\1\.c\",/" | LC_ALL=C sort)
            ],
        },
    },
}

cc_defaults {
    name: "bison_${NAME}_defaults",
    target: {
        $TARGET: {
            srcs: [
                $(find src -name '*.o' | sed "s/bison-//" | sed -E "s/(.*)\.o/\"\1\.c\",/" | LC_ALL=C sort)
            ],
        },
    },
}
END
${ANDROID_BUILD_TOP}/prebuilts/build-tools/$UNAME-x86/bin/bpfmt -w $GENBP

cd ../
rm -rf tmp