termux-packages/scripts/build/setup/termux_setup_gn.sh

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termux_setup_gn() {
termux_setup_ninja
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local GN_COMMIT=4aa9bdfa05b688c58d3d7d3e496f3f18cbb3d89e
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local GN_TARFILE=$TERMUX_COMMON_CACHEDIR/gn_$GN_COMMIT.tar.gz
local GN_SOURCE=https://gn.googlesource.com/gn/+archive/$GN_COMMIT.tar.gz
if [ "${TERMUX_PACKAGES_OFFLINE-false}" = "true" ]; then
GN_FOLDER=$TERMUX_SCRIPTDIR/build-tools/gn-$GN_COMMIT
else
GN_FOLDER=$TERMUX_COMMON_CACHEDIR/gn-$GN_COMMIT
fi
if [ "$TERMUX_ON_DEVICE_BUILD" = "false" ]; then
if [ ! -d "$GN_FOLDER" ]; then
# FIXME: We would like to enable checksums when downloading
# tar files, but they change each time as the tar metadata
# differs: https://github.com/google/gitiles/issues/84
termux_download \
$GN_SOURCE \
$GN_TARFILE \
SKIP_CHECKSUM
mkdir -p $GN_FOLDER
tar xf $GN_TARFILE -C $GN_FOLDER
local LAST_PWD=$(pwd)
cd $GN_FOLDER
(
unset CC CXX CFLAGS CXXFLAGS LD LDFLAGS AR AS CPP OBJCOPY OBJDUMP RANLIB READELF STRIP
./build/gen.py \
--no-last-commit-position
cat <<-EOF >./out/last_commit_position.h
#ifndef OUT_LAST_COMMIT_POSITION_H_
#define OUT_LAST_COMMIT_POSITION_H_
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#define LAST_COMMIT_POSITION_NUM 1945
#define LAST_COMMIT_POSITION "1945 ${GN_COMMIT:0:8}"
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#endif // OUT_LAST_COMMIT_POSITION_H_
EOF
ninja -C out/
)
cd $LAST_PWD
fi
export PATH=$GN_FOLDER/out:$PATH
else
if [ "$(dpkg-query -W -f '${db:Status-Status}\n' gn 2>/dev/null)" != "installed" ]; then
echo "Package 'gn' is not installed."
echo "You can install it with"
echo
echo " pkg install gn"
echo
exit 1
fi
fi
}