new package: gn (#7290)

build-package.sh

@@ -55,6 +55,10 @@ source "$TERMUX_SCRIPTDIR/scripts/build/termux_download.sh"
 # shellcheck source=scripts/build/setup/termux_setup_ghc.sh
 source "$TERMUX_SCRIPTDIR/scripts/build/setup/termux_setup_ghc.sh"
 
+# Utility function for setting up GN toolchain.
+# shellcheck source=scripts/build/setup/termux_setup_gn.sh
+source "$TERMUX_SCRIPTDIR/scripts/build/setup/termux_setup_gn.sh"
+
 # Utility function for golang-using packages to setup a go toolchain.
 # shellcheck source=scripts/build/setup/termux_setup_golang.sh
 source "$TERMUX_SCRIPTDIR/scripts/build/setup/termux_setup_golang.sh"

packages/gn/build-gen.py.patch

@@ -0,0 +1,11 @@
+--- ./build/gen.py.orig	2021-08-09 14:54:18.428308993 +0530
++++ ./build/gen.py	2021-08-09 14:55:03.628308976 +0530
+@@ -785,6 +785,8 @@
+   executables['gn']['libs'].extend(static_libraries.keys())
+   executables['gn_unittests']['libs'].extend(static_libraries.keys())
+ 
++  del executables['gn_unittests']
++
+   WriteGenericNinja(path, static_libraries, executables, cxx, ar, ld,
+                     platform, host, options, cflags, ldflags,
+                     libflags, include_dirs, libs)

packages/gn/build.sh

@@ -0,0 +1,50 @@
+TERMUX_PKG_HOMEPAGE=https://gn.googlesource.com/gn
+TERMUX_PKG_DESCRIPTION="Meta-build system that generates build files for Ninja"
+TERMUX_PKG_LICENSE="BSD 3-Clause"
+TERMUX_PKG_MAINTAINER="Yaksh Bariya <yakshbari4@gmail.com>"
+# While updating commit hash here also update it in
+# termux_setup_gn
+_COMMIT=69ec4fca1fa69ddadae13f9e6b7507efa0675263
+TERMUX_PKG_VERSION=0.1
+TERMUX_PKG_RECOMMENDS="ninja"
+TERMUX_PKG_SKIP_SRC_EXTRACT=true
+TERMUX_PKG_BUILD_IN_SRC=true
+
+termux_step_get_source() {
+	TERMUX_PKG_SRCURL=https://gn.googlesource.com/gn/+archive/$_COMMIT.tar.gz
+	# Prevent caching of builds
+	rm -rf $TERMUX_PKG_SRCDIR
+	# FIXME: We would like to enable checksums when downloading
+	# tar files, but they change each time as the tar metadata
+	# differs: https://github.com/google/gitiles/issues/84
+	GN_TARFILE=$TERMUX_PKG_CACHEDIR/gn_$_COMMIT.tar.gz
+	test ! -f $GN_TARFILE && termux_download \
+		$TERMUX_PKG_SRCURL \
+		$GN_TARFILE \
+		SKIP_CHECKSUM
+	mkdir -p $TERMUX_PKG_SRCDIR
+	tar xf $GN_TARFILE -C $TERMUX_PKG_SRCDIR
+}
+
+termux_step_configure() {
+	./build/gen.py \
+		--no-last-commit-position \
+		--no-static-libstdc++
+
+	cat <<- EOF > ./out/last_commit_position.h
+	#ifndef OUT_LAST_COMMIT_POSITION_H_
+	#define OUT_LAST_COMMIT_POSITION_H_
+	#define LAST_COMMIT_POSITION_NUM ${TERMUX_PKG_VERSION##0.}
+	#define LAST_COMMIT_POSITION "${TERMUX_PKG_VERSION}"
+	#endif  // OUT_LAST_COMMIT_POSITION_H_
+	EOF
+}
+
+termux_step_make() {
+	termux_setup_ninja
+	ninja -C out/
+}
+
+termux_step_make_install() {
+	install -Dm755 -t $TERMUX_PREFIX/bin out/gn
+}

scripts/build/setup/termux_setup_gn.sh

@@ -0,0 +1,52 @@
+termux_setup_gn() {
+	termux_setup_ninja
+	local GN_COMMIT=69ec4fca1fa69ddadae13f9e6b7507efa0675263
+	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 $GN_FOLDER
+			(
+				unset CC CXX CFLAGS CXXFLAGS LD LDFLAGS AR AS CPP OBJCOPY OBJDUMP RANLIB READELF STRIP
+				./build/gen.py \
+					--no-last-commit-position
+				cat <<-EOF >./out/last_commit_position.h
+					#ifndef OUT_LAST_COMMIT_POSITION_H_
+					#define OUT_LAST_COMMIT_POSITION_H_
+					#define LAST_COMMIT_POSITION_NUM 1
+					#define LAST_COMMIT_POSITION "${GN_COMMIT}"
+					#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
+}