X-Git-Url: https://git.distorted.org.uk/~mdw/termux-packages/blobdiff_plain/382cfb780ca9a40f80e3932544bd32aeccb66e5a..df4f4e1787b6f2982f1e6472677769adc6014b48:/build-package.sh

diff --git a/build-package.sh b/build-package.sh
index c670f37d..dd72ed7d 100755
--- a/build-package.sh
+++ b/build-package.sh
@@ -11,7 +11,6 @@ test -f $HOME/.termuxrc && . $HOME/.termuxrc
 : ${TERMUX_MAKE_PROCESSES:='4'}
 : ${TERMUX_TOPDIR:="$HOME/.termux-build"}
 : ${TERMUX_ARCH:="aarch64"} # (arm|aarch64|i686|x86_64) - the x86_64 arch is not yet used or tested.
-: ${TERMUX_CLANG:=""} # Set to non-empty to use clang.
 : ${TERMUX_PREFIX:='/data/data/com.termux/files/usr'}
 : ${TERMUX_ANDROID_HOME:='/data/data/com.termux/files/home'}
 : ${TERMUX_DEBUG:=""}
@@ -50,21 +49,6 @@ else
 	exit 1
 fi
 
-# Compute standalone toolchain dir, bitness of arch and name of host platform:
-TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_TOPDIR/_lib/android-standalone-toolchain-${TERMUX_ARCH}-ndk${TERMUX_NDK_VERSION}-api${TERMUX_API_LEVEL}-"
-if [ "$TERMUX_CLANG" = "" ]; then
-	TERMUX_STANDALONE_TOOLCHAIN+="gcc4.9"
-else
-	TERMUX_STANDALONE_TOOLCHAIN+="clang38"
-fi
-if [ "x86_64" = $TERMUX_ARCH -o "aarch64" = $TERMUX_ARCH ]; then
-	TERMUX_ARCH_BITS=64
-else
-	TERMUX_ARCH_BITS=32
-fi
-TERMUX_HOST_PLATFORM="${TERMUX_ARCH}-linux-android"
-if [ $TERMUX_ARCH = "arm" ]; then TERMUX_HOST_PLATFORM="${TERMUX_HOST_PLATFORM}eabi"; fi
-
 # Check the package to build:
 TERMUX_PKG_NAME=`basename $1`
 export TERMUX_SCRIPTDIR=`cd $(dirname $0); pwd`
@@ -90,19 +74,12 @@ if [ $TERMUX_ARCH = 'all' ]; then
 	exit
 fi
 
-echo "termux - building $1 for arch $TERMUX_ARCH..."
-test -t 1 && printf "\033]0;$1...\007"
-
 # We do not put all of build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/ into PATH
 # to avoid stuff like arm-linux-androideabi-ld there to conflict with ones from
 # the standalone toolchain.
 TERMUX_DX=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/dx
 TERMUX_JACK=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jack.jar
 TERMUX_JILL=$ANDROID_HOME/build-tools/$TERMUX_ANDROID_BUILD_TOOLS_VERSION/jill.jar
-
-# We put this after system PATH to avoid picking up toolchain stripped python
-export PATH=$PATH:$TERMUX_STANDALONE_TOOLCHAIN/bin
-
 # Make $TERMUX_TAR and $TERMUX_TOUCH point at gnu versions:
 export TERMUX_TAR="tar"
 test `uname` = "Darwin" && TERMUX_TAR=gtar
@@ -110,108 +87,10 @@ export TERMUX_TOUCH="touch"
 test `uname` = "Darwin" && TERMUX_TOUCH=gtouch
 
 export prefix=${TERMUX_PREFIX} # prefix is used by some makefiles
-#export ACLOCAL="aclocal -I $TERMUX_PREFIX/share/aclocal"
-export AR=$TERMUX_HOST_PLATFORM-ar
-if [ "$TERMUX_CLANG" = "" ]; then
-	export AS=${TERMUX_HOST_PLATFORM}-gcc
-	export CC=$TERMUX_HOST_PLATFORM-gcc
-	export CXX=$TERMUX_HOST_PLATFORM-g++
-	_SPECSFLAG="-specs=$TERMUX_SCRIPTDIR/termux.spec"
-else
-	export AS=${TERMUX_HOST_PLATFORM}-gcc
-	export CC=$TERMUX_HOST_PLATFORM-clang
-	export CXX=$TERMUX_HOST_PLATFORM-clang++
-	# TODO: clang does not have specs file, how to ensure pie
-	# binaries gets built?
-	_SPECSFLAG=""
-fi
-export CPP=${TERMUX_HOST_PLATFORM}-cpp
-export CC_FOR_BUILD=gcc
-export LD=$TERMUX_HOST_PLATFORM-ld
-export OBJDUMP=$TERMUX_HOST_PLATFORM-objdump
-# Setup pkg-config for cross-compiling:
-export PKG_CONFIG=$TERMUX_STANDALONE_TOOLCHAIN/bin/${TERMUX_HOST_PLATFORM}-pkg-config
-export PKG_CONFIG_LIBDIR=$TERMUX_PREFIX/lib/pkgconfig
-export RANLIB=$TERMUX_HOST_PLATFORM-ranlib
-export READELF=$TERMUX_HOST_PLATFORM-readelf
-export STRIP=$TERMUX_HOST_PLATFORM-strip
-
-export CFLAGS="$_SPECSFLAG"
-export LDFLAGS="$_SPECSFLAG -L${TERMUX_PREFIX}/lib"
-
-if [ "$TERMUX_ARCH" = "arm" ]; then
-	CFLAGS+=" -march=armv7-a -mfpu=neon -mfloat-abi=softfp"
-	# "first flag instructs the linker to pick libgcc.a, libgcov.a, and
-	# crt*.o, which are tailored for armv7-a"
-	# - https://developer.android.com/ndk/guides/standalone_toolchain.html
-	LDFLAGS+=" -march=armv7-a -Wl,--fix-cortex-a8"
-elif [ $TERMUX_ARCH = "i686" ]; then
-	# From $NDK/docs/CPU-ARCH-ABIS.html:
-	CFLAGS+=" -march=i686 -msse3 -mstackrealign -mfpmath=sse"
-elif [ $TERMUX_ARCH = "aarch64" ]; then
-	LDFLAGS+=" -Wl,-rpath-link,$TERMUX_PREFIX/lib"
-	LDFLAGS+=" -Wl,-rpath-link,$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib"
-elif [ $TERMUX_ARCH = "x86_64" ]; then
-	:
-else
-	echo "Error: Invalid arch '$TERMUX_ARCH' - support arches are 'arm', 'i686', 'aarch64', 'x86_64'"
-	exit 1
-fi
-
-if [ -n "$TERMUX_DEBUG" ]; then
-        CFLAGS+=" -g3 -Og -fstack-protector --param ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
-else
-        CFLAGS+=" -Os"
-fi
-
-export CXXFLAGS="$CFLAGS"
-export CPPFLAGS="-I${TERMUX_PREFIX}/include"
-
-export ac_cv_func_getpwent=no
-export ac_cv_func_getpwnam=no
-export ac_cv_func_getpwuid=no
-
-if [ ! -d $TERMUX_STANDALONE_TOOLCHAIN ]; then
-	# See https://developer.android.com/ndk/guides/standalone_toolchain.html about toolchain naming.
-	if [ "i686" = $TERMUX_ARCH ]; then
-		_TERMUX_NDK_TOOLCHAIN_NAME="x86"
-	elif [ "x86_64" = $TERMUX_ARCH ]; then
-		_TERMUX_NDK_TOOLCHAIN_NAME="x86_64"
-	else
-		_TERMUX_NDK_TOOLCHAIN_NAME="$TERMUX_HOST_PLATFORM"
-	fi
-
-	if [ "$TERMUX_CLANG" = "" ]; then
-		_TERMUX_TOOLCHAIN="${_TERMUX_NDK_TOOLCHAIN_NAME}-4.9"
-	else
-		_TERMUX_TOOLCHAIN="${_TERMUX_NDK_TOOLCHAIN_NAME}-clang"
-	fi
-
-	# Do not put toolchain in place until we are done with setup, to avoid having a half setup
-	# toolchain left in place if something goes wrong (or process is just aborted):
-	_TERMUX_TOOLCHAIN_TMPDIR=${TERMUX_STANDALONE_TOOLCHAIN}-tmp
-	rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR
-
-	bash $NDK/build/tools/make-standalone-toolchain.sh --platform=android-$TERMUX_API_LEVEL --toolchain=${_TERMUX_TOOLCHAIN} \
-		--install-dir=$_TERMUX_TOOLCHAIN_TMPDIR
-        if [ "arm" = $TERMUX_ARCH ]; then
-                # Fix to allow e.g. <bits/c++config.h> to be included:
-                cp $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/arm-linux-androideabi/armv7-a/bits/* $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/bits
-        fi
-	cd $_TERMUX_TOOLCHAIN_TMPDIR/sysroot
-	for f in $TERMUX_SCRIPTDIR/ndk_patches/*.patch; do
-		sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $f | \
-			sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
-			patch --silent -p1;
-	done
-        # elf.h is taken from glibc since the elf.h in the NDK is lacking.
-	# sysexits.h is header-only and used by a few programs.
-	cp $TERMUX_SCRIPTDIR/ndk_patches/{elf.h,sysexits.h} $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/include
-	mv $_TERMUX_TOOLCHAIN_TMPDIR $TERMUX_STANDALONE_TOOLCHAIN
-fi
-
+export PREFIX=${TERMUX_PREFIX} # PREFIX is used by some makefiles
 export TERMUX_COMMON_CACHEDIR="$TERMUX_TOPDIR/_cache"
 export TERMUX_DEBDIR="$TERMUX_SCRIPTDIR/debs"
+export PKG_CONFIG_LIBDIR=$TERMUX_PREFIX/lib/pkgconfig
 mkdir -p $TERMUX_COMMON_CACHEDIR $TERMUX_DEBDIR
 
 TERMUX_PKG_BUILDDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/build
@@ -219,6 +98,7 @@ TERMUX_PKG_CACHEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/cache
 TERMUX_PKG_MASSAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/massage
 TERMUX_PKG_PACKAGEDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/package
 TERMUX_PKG_SRCDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/src
+TERMUX_PKG_SHA256=""
 TERMUX_PKG_TMPDIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/tmp
 TERMUX_PKG_HOSTBUILD_DIR=$TERMUX_TOPDIR/$TERMUX_PKG_NAME/host-build
 TERMUX_PKG_PLATFORM_INDEPENDENT=""
@@ -237,12 +117,14 @@ TERMUX_PKG_KEEP_STATIC_LIBRARIES="false"
 TERMUX_PKG_KEEP_HEADER_FILES="false"
 TERMUX_PKG_ESSENTIAL=""
 TERMUX_PKG_CONFLICTS="" # https://www.debian.org/doc/debian-policy/ch-relationships.html#s-conflicts
+TERMUX_PKG_REPLACES=""
 TERMUX_PKG_CONFFILES=""
 TERMUX_PKG_INCLUDE_IN_DEVPACKAGE=""
 TERMUX_PKG_DEVPACKAGE_DEPENDS=""
 # Set if a host build should be done in TERMUX_PKG_HOSTBUILD_DIR:
 TERMUX_PKG_HOSTBUILD=""
 TERMUX_PKG_MAINTAINER="Fredrik Fornwall <fredrik@fornwall.net>"
+TERMUX_PKG_CLANG=no
 
 # Cleanup old state
 rm -Rf $TERMUX_PKG_BUILDDIR $TERMUX_PKG_PACKAGEDIR $TERMUX_PKG_SRCDIR $TERMUX_PKG_TMPDIR $TERMUX_PKG_MASSAGEDIR
@@ -274,77 +156,48 @@ echo $TERMUX_ARCH > $TERMUX_ARCH_FILE
 mkdir -p $TERMUX_PKG_BUILDDIR $TERMUX_PKG_PACKAGEDIR $TERMUX_PKG_TMPDIR $TERMUX_PKG_CACHEDIR $TERMUX_PKG_MASSAGEDIR $PKG_CONFIG_LIBDIR $TERMUX_PREFIX/{bin,etc,lib,libexec,share,tmp,include}
 
 termux_download() {
-        URL="$1"
-        DESTINATION="$2"
-
-        TMPFILE=`mktemp $TERMUX_PKG_TMPDIR/download.XXXXXXXXX`
-        for i in 1 2 3; do
-                if curl -L --fail --retry 2 -o "$TMPFILE" "$URL"; then
-                        mv "$TMPFILE" "$DESTINATION"
-                        return
-                else
-                        echo "Download of $1 failed (attempt $i/3)" 1>&2
-                        sleep 6
-                fi
-        done
-        echo "Failed to download $1 - exiting" 1>&2
-        exit 1
-}
+	URL="$1"
+	DESTINATION="$2"
+
+	TMPFILE=`mktemp $TERMUX_PKG_TMPDIR/download.$TERMUX_PKG_NAME.XXXXXXXXX`
+	echo "Downloading ${URL}"
+	TRYMAX=6
+	for try in $(seq 1 $TRYMAX); do
+		if curl -L --fail --retry 2 -o "$TMPFILE" "$URL"; then
+			if [ $# = 3 ]; then
+				# Optional checksum argument:
+				echo $3  "$TMPFILE" | sha256sum --check --strict --quiet
+			else
+				echo "Note: No checksum of file"
+				sha256sum $TMPFILE
+			fi
+			mv "$TMPFILE" "$DESTINATION"
+			return
+		else
+			echo "Download of $1 failed (attempt $try/$TRYMAX)" 1>&2
+			sleep 45
+		fi
+	done
 
-# Get fresh versions of config.sub and config.guess
-for f in config.sub config.guess; do
-	if [ ! -f $TERMUX_COMMON_CACHEDIR/$f ]; then
-		termux_download "http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=${f};hb=HEAD" $TERMUX_COMMON_CACHEDIR/$f
-	fi
-done
+	echo "Failed to download $1 - exiting" 1>&2
+	exit 1
+}
 
 # Have a debian-binary file ready for deb packaging:
 test ! -f $TERMUX_COMMON_CACHEDIR/debian-binary && echo "2.0" > $TERMUX_COMMON_CACHEDIR/debian-binary
 # The host tuple that may be given to --host configure flag, but normally autodetected so not needed explicitly
-TERMUX_HOST_TUPLE=`sh $TERMUX_COMMON_CACHEDIR/config.guess`
+TERMUX_HOST_TUPLE=`sh $TERMUX_SCRIPTDIR/scripts/config.guess`
 
 # Make $TERMUX_PREFIX/bin/sh executable on the builder, so that build script can assume that it works
 # on both builder and host later on:
 ln -f -s /bin/sh $TERMUX_PREFIX/bin/sh
 
-if [ ! -f $PKG_CONFIG ]; then
-	echo "Creating pkg-config wrapper..."
-	# We use path to host pkg-config to avoid picking up a cross-compiled pkg-config later on
-	_HOST_PKGCONFIG=`which pkg-config`
-	mkdir -p $TERMUX_STANDALONE_TOOLCHAIN/bin $PKG_CONFIG_LIBDIR
-	cat > $PKG_CONFIG <<HERE
-#!/bin/sh
-export PKG_CONFIG_DIR=
-export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR
-# export PKG_CONFIG_SYSROOT_DIR=${TERMUX_PREFIX}
-exec $_HOST_PKGCONFIG "\$@"
-HERE
-	chmod +x $PKG_CONFIG
-
-	# Add a pkg-config file for the system zlib
-	cat > $PKG_CONFIG_LIBDIR/zlib.pc <<HERE
-Name: zlib
-Description: zlib compression library
-Version: 1.2.3
-
-Requires:
-Libs: -L$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib -lz
-Cflags: -I$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/include
-HERE
-fi
-
 TERMUX_ELF_CLEANER=$TERMUX_COMMON_CACHEDIR/termux-elf-cleaner
 TERMUX_ELF_CLEANER_SRC=$TERMUX_SCRIPTDIR/packages/termux-elf-cleaner/termux-elf-cleaner.cpp
 if [ $TERMUX_ELF_CLEANER_SRC -nt $TERMUX_ELF_CLEANER ]; then
 	g++ -std=c++11 -Wall -Wextra -pedantic -Os $TERMUX_ELF_CLEANER_SRC -o $TERMUX_ELF_CLEANER
 fi
 
-# Keep track of when build started so we can see what files have been created
-export TERMUX_BUILD_TS_FILE=$TERMUX_PKG_TMPDIR/timestamp_$TERMUX_PKG_NAME
-sleep 1 # Sleep so that any generated files above (such as zlib.c and $PREFIX/bin/sh)
-	#get older timestamp then TERMUX_BUILD_TS_FILE
-rm -f $TERMUX_BUILD_TS_FILE && touch $TERMUX_BUILD_TS_FILE
-
 # Run just after sourcing $TERMUX_PKG_BUILDER_SCRIPT
 termux_step_extract_package () {
         if [ -z "${TERMUX_PKG_SRCURL:=""}" ]; then
@@ -354,8 +207,8 @@ termux_step_extract_package () {
 	cd $TERMUX_PKG_TMPDIR
 	filename=`basename $TERMUX_PKG_SRCURL`
 	file=$TERMUX_PKG_CACHEDIR/$filename
-	# Set "TERMUX_PKG_NO_SRC_CACHE=yes" in package to never cache packages, such as in git builds:
-	test -n ${TERMUX_PKG_NO_SRC_CACHE-""} -o ! -f $file && termux_download $TERMUX_PKG_SRCURL $file
+	test ! -f $file && termux_download $TERMUX_PKG_SRCURL $file $TERMUX_PKG_SHA256
+
 	if [ "x$TERMUX_PKG_FOLDERNAME" = "x" ]; then
 		folder=`basename $filename .tar.bz2` && folder=`basename $folder .tar.gz` && folder=`basename $folder .tar.xz` && folder=`basename $folder .tar.lz` && folder=`basename $folder .tgz` && folder=`basename $folder .zip`
 		folder=`echo $folder | sed 's/_/-/'` # dpkg uses _ in tar filename, but - in folder
@@ -364,7 +217,7 @@ termux_step_extract_package () {
 	fi
 	rm -Rf $folder
 	if [ ${file##*.} = zip ]; then
-		unzip $file
+		unzip -q $file
 	else
 		$TERMUX_TAR xf $file
 	fi
@@ -392,8 +245,8 @@ termux_step_patch_package () {
 			patch --silent -p1
 	done
 
-	find . -name config.sub -exec chmod u+w '{}' \; -exec cp $TERMUX_COMMON_CACHEDIR/config.sub '{}' \;
-	find . -name config.guess -exec chmod u+w '{}' \; -exec cp $TERMUX_COMMON_CACHEDIR/config.guess '{}' \;
+	find . -name config.sub -exec chmod u+w '{}' \; -exec cp $TERMUX_SCRIPTDIR/scripts/config.sub '{}' \;
+	find . -name config.guess -exec chmod u+w '{}' \; -exec cp $TERMUX_SCRIPTDIR/scripts/config.guess '{}' \;
 }
 
 termux_step_pre_configure () {
@@ -532,23 +385,23 @@ termux_step_massage () {
 	# .. move over sbin to bin
 	for file in sbin/*; do if test -f $file; then mv $file bin/; fi; done
 
-	# file(1) may fail for certain unusual files, so disable pipefail
-	set +e +o pipefail
-        # Remove world permissions and add write permissions:
-        find . -exec chmod u+w,o-rwx \{\} \;
-	# .. strip binaries (setting them as writeable first)
+        # Remove world permissions and add write permissions.
+	# The -f flag is used to suppress warnings about dangling symlinks (such
+	# as ones to /system/... which may not exist on the build machine):
+        find . -exec chmod -f u+w,o-rwx \{\} \;
 	if [ "$TERMUX_DEBUG" = "" ]; then
-                find . -type f | xargs file | grep -E "(executable|shared object)" | grep ELF | cut -f 1 -d : | xargs $STRIP --strip-unneeded --preserve-dates -R '.gnu.version*'
+		# Strip binaries. file(1) may fail for certain unusual files, so disable pipefail.
+		set +e +o pipefail
+		find . -type f | xargs -r file | grep -E "(executable|shared object)" | grep ELF | cut -f 1 -d : | \
+			xargs -r $STRIP --strip-unneeded --preserve-dates -R '.gnu.version*'
+		set -e -o pipefail
+		# Remove DT_ entries which the android 5.1 linker warns about:
+		find . -type f -print0 | xargs -r -0 $TERMUX_ELF_CLEANER
 	fi
         # Fix shebang paths:
         for file in `find -L . -type f`; do
                 head -c 100 $file | grep -E "^#\!.*\\/bin\\/.*" | grep -q -E -v "^#\! ?\\/system" && sed --follow-symlinks -i -E "1 s@^#\!(.*)/bin/(.*)@#\!$TERMUX_PREFIX/bin/\2@" $file
         done
-	set -e -o pipefail
-        # Remove DT_ entries which the android 5.1 linker warns about:
-	if [ "$TERMUX_DEBUG" = "" ]; then
-		find . -type f -print0 | xargs -0 $TERMUX_ELF_CLEANER
-	fi
 
 	test ! -z "$TERMUX_PKG_RM_AFTER_INSTALL" && rm -Rf $TERMUX_PKG_RM_AFTER_INSTALL
 
@@ -665,7 +518,7 @@ termux_setup_golang () {
 		exit 1
 	fi
 
-	local TERMUX_GO_VERSION=go1.6.2
+	local TERMUX_GO_VERSION=go1.7.1
 	local TERMUX_GO_PLATFORM=linux-amd64
 	test `uname` = "Darwin" && TERMUX_GO_PLATFORM=darwin-amd64
 
@@ -683,6 +536,14 @@ termux_setup_golang () {
 
 source $TERMUX_PKG_BUILDER_SCRIPT
 
+if [ -n "${TERMUX_PKG_BLACKLISTED_ARCHES:=""}" -a "$TERMUX_PKG_BLACKLISTED_ARCHES" != "${TERMUX_PKG_BLACKLISTED_ARCHES/$TERMUX_ARCH/}" ]; then
+	echo "Skipping building $TERMUX_PKG_NAME for arch $TERMUX_ARCH"
+	exit 0
+fi
+
+echo "termux - building $1 for arch $TERMUX_ARCH..."
+test -t 1 && printf "\033]0;$1...\007"
+
 # Compute full version:
 TERMUX_PKG_FULLVERSION=$TERMUX_PKG_VERSION
 if [ "$TERMUX_PKG_BUILD_REVISION" != "0" -o "$TERMUX_PKG_FULLVERSION" != "${TERMUX_PKG_FULLVERSION/-/}" ]; then
@@ -690,6 +551,180 @@ if [ "$TERMUX_PKG_BUILD_REVISION" != "0" -o "$TERMUX_PKG_FULLVERSION" != "${TERM
 	TERMUX_PKG_FULLVERSION+="-$TERMUX_PKG_BUILD_REVISION"
 fi
 
+# Compute standalone toolchain dir, bitness of arch and name of host platform:
+TERMUX_STANDALONE_TOOLCHAIN="$TERMUX_TOPDIR/_lib/toolchain-${TERMUX_ARCH}-ndk${TERMUX_NDK_VERSION}-api${TERMUX_API_LEVEL}-"
+if [ "$TERMUX_PKG_CLANG" = "no" ]; then
+	TERMUX_STANDALONE_TOOLCHAIN+="gcc4.9"
+else
+	TERMUX_STANDALONE_TOOLCHAIN+="clang38"
+fi
+# Bump the below version if a change is made in toolchain setup, to ensure
+# that everyone gets an updated toolchain:
+TERMUX_STANDALONE_TOOLCHAIN+="-v1"
+
+# We put this after system PATH to avoid picking up toolchain stripped python
+export PATH=$PATH:$TERMUX_STANDALONE_TOOLCHAIN/bin
+
+if [ "x86_64" = $TERMUX_ARCH -o "aarch64" = $TERMUX_ARCH ]; then
+	TERMUX_ARCH_BITS=64
+else
+	TERMUX_ARCH_BITS=32
+fi
+TERMUX_HOST_PLATFORM="${TERMUX_ARCH}-linux-android"
+if [ $TERMUX_ARCH = "arm" ]; then TERMUX_HOST_PLATFORM="${TERMUX_HOST_PLATFORM}eabi"; fi
+
+export AR=$TERMUX_HOST_PLATFORM-ar
+if [ "$TERMUX_PKG_CLANG" = "no" ]; then
+	export AS=${TERMUX_HOST_PLATFORM}-gcc
+	export CC=$TERMUX_HOST_PLATFORM-gcc
+	export CXX=$TERMUX_HOST_PLATFORM-g++
+	_SPECSFLAG="-specs=$TERMUX_SCRIPTDIR/termux.spec"
+else
+	export AS=${TERMUX_HOST_PLATFORM}-gcc
+	export CC=$TERMUX_HOST_PLATFORM-clang
+	export CXX=$TERMUX_HOST_PLATFORM-clang++
+	# TODO: clang does not have specs file, how to ensure pie
+	# binaries gets built?
+	_SPECSFLAG=""
+fi
+export CPP=${TERMUX_HOST_PLATFORM}-cpp
+export CC_FOR_BUILD=gcc
+export LD=$TERMUX_HOST_PLATFORM-ld
+export OBJDUMP=$TERMUX_HOST_PLATFORM-objdump
+# Setup pkg-config for cross-compiling:
+export PKG_CONFIG=$TERMUX_STANDALONE_TOOLCHAIN/bin/${TERMUX_HOST_PLATFORM}-pkg-config
+export RANLIB=$TERMUX_HOST_PLATFORM-ranlib
+export READELF=$TERMUX_HOST_PLATFORM-readelf
+export STRIP=$TERMUX_HOST_PLATFORM-strip
+
+export CFLAGS="$_SPECSFLAG"
+export LDFLAGS="$_SPECSFLAG -L${TERMUX_PREFIX}/lib"
+
+if [ "$TERMUX_ARCH" = "arm" ]; then
+	CFLAGS+=" -march=armv7-a -mfpu=neon -mfloat-abi=softfp"
+	# "first flag instructs the linker to pick libgcc.a, libgcov.a, and
+	# crt*.o, which are tailored for armv7-a"
+	# - https://developer.android.com/ndk/guides/standalone_toolchain.html
+	LDFLAGS+=" -march=armv7-a -Wl,--fix-cortex-a8"
+elif [ $TERMUX_ARCH = "i686" ]; then
+	# From $NDK/docs/CPU-ARCH-ABIS.html:
+	CFLAGS+=" -march=i686 -msse3 -mstackrealign -mfpmath=sse"
+elif [ $TERMUX_ARCH = "aarch64" ]; then
+	LDFLAGS+=" -Wl,-rpath-link,$TERMUX_PREFIX/lib"
+	LDFLAGS+=" -Wl,-rpath-link,$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib"
+elif [ $TERMUX_ARCH = "x86_64" ]; then
+	:
+else
+	echo "Error: Invalid arch '$TERMUX_ARCH' - support arches are 'arm', 'i686', 'aarch64', 'x86_64'"
+	exit 1
+fi
+
+if [ -n "$TERMUX_DEBUG" ]; then
+        CFLAGS+=" -g3 -Og -fstack-protector --param ssp-buffer-size=4 -D_FORTIFY_SOURCE=2"
+else
+        CFLAGS+=" -Os"
+fi
+
+export CXXFLAGS="$CFLAGS"
+export CPPFLAGS="-I${TERMUX_PREFIX}/include"
+
+export ac_cv_func_getpwent=no
+export ac_cv_func_getpwnam=no
+export ac_cv_func_getpwuid=no
+
+if [ ! -d $TERMUX_STANDALONE_TOOLCHAIN ]; then
+	# See https://developer.android.com/ndk/guides/standalone_toolchain.html about toolchain naming.
+	if [ "i686" = $TERMUX_ARCH ]; then
+		_TERMUX_NDK_TOOLCHAIN_NAME="x86"
+	elif [ "x86_64" = $TERMUX_ARCH ]; then
+		_TERMUX_NDK_TOOLCHAIN_NAME="x86_64"
+	else
+		_TERMUX_NDK_TOOLCHAIN_NAME="$TERMUX_HOST_PLATFORM"
+	fi
+
+	if [ "$TERMUX_PKG_CLANG" = "no" ]; then
+		_TERMUX_TOOLCHAIN="${_TERMUX_NDK_TOOLCHAIN_NAME}-4.9"
+	else
+		_TERMUX_TOOLCHAIN="${_TERMUX_NDK_TOOLCHAIN_NAME}-clang"
+	fi
+
+	# Do not put toolchain in place until we are done with setup, to avoid having a half setup
+	# toolchain left in place if something goes wrong (or process is just aborted):
+	_TERMUX_TOOLCHAIN_TMPDIR=${TERMUX_STANDALONE_TOOLCHAIN}-tmp
+	rm -Rf $_TERMUX_TOOLCHAIN_TMPDIR
+
+	bash $NDK/build/tools/make-standalone-toolchain.sh --platform=android-$TERMUX_API_LEVEL --toolchain=${_TERMUX_TOOLCHAIN} \
+		--install-dir=$_TERMUX_TOOLCHAIN_TMPDIR
+        if [ "arm" = $TERMUX_ARCH ]; then
+                # Fix to allow e.g. <bits/c++config.h> to be included:
+                cp $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/arm-linux-androideabi/armv7-a/bits/* $_TERMUX_TOOLCHAIN_TMPDIR/include/c++/4.9.x/bits
+        fi
+	cd $_TERMUX_TOOLCHAIN_TMPDIR/sysroot
+	for f in $TERMUX_SCRIPTDIR/ndk_patches/*.patch; do
+		sed "s%\@TERMUX_PREFIX\@%${TERMUX_PREFIX}%g" $f | \
+			sed "s%\@TERMUX_HOME\@%${TERMUX_ANDROID_HOME}%g" | \
+			patch --silent -p1;
+	done
+        # elf.h is taken from glibc since the elf.h in the NDK is lacking.
+	# sysexits.h is header-only and used by a few programs.
+	cp $TERMUX_SCRIPTDIR/ndk_patches/{elf.h,sysexits.h} $_TERMUX_TOOLCHAIN_TMPDIR/sysroot/usr/include
+	mv $_TERMUX_TOOLCHAIN_TMPDIR $TERMUX_STANDALONE_TOOLCHAIN
+fi
+
+if [ ! -f $TERMUX_PREFIX/lib/libstdc++.so ]; then
+	# Setup libgnustl_shared.so in $PREFIX/lib and libstdc++.so as a symlink to it,
+	# so that other C++ using packages links to it instead of the default android
+	# C++ library which does not support exceptions or STL:
+	# https://developer.android.com/ndk/guides/cpp-support.html
+	# We do however want to avoid installing this, to avoid problems # where e.g.
+	# libm.so on some i686 devices links against libstdc++.so.
+	# The libgnustl_shared.so library will be packaged in the libgnustl package
+	# which is part of the base Termux installation.
+	mkdir -p $TERMUX_PREFIX/lib
+	cd $TERMUX_PREFIX/lib
+        _STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/libgnustl_shared.so
+	if [ $TERMUX_ARCH = arm ]; then
+		_STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib/armv7-a/libgnustl_shared.so
+	elif [ $TERMUX_ARCH = x86_64 ]; then
+		_STL_LIBFILE=$TERMUX_STANDALONE_TOOLCHAIN/${TERMUX_HOST_PLATFORM}/lib64/libgnustl_shared.so
+	fi
+	cp $_STL_LIBFILE .
+	ln -f -s libgnustl_shared.so libstdc++.so
+fi
+
+if [ ! -f $PKG_CONFIG ]; then
+	echo "Creating pkg-config wrapper..."
+	# We use path to host pkg-config to avoid picking up a cross-compiled pkg-config later on
+	_HOST_PKGCONFIG=`which pkg-config`
+	mkdir -p $TERMUX_STANDALONE_TOOLCHAIN/bin $PKG_CONFIG_LIBDIR
+	cat > $PKG_CONFIG <<HERE
+#!/bin/sh
+export PKG_CONFIG_DIR=
+export PKG_CONFIG_LIBDIR=$PKG_CONFIG_LIBDIR
+# export PKG_CONFIG_SYSROOT_DIR=${TERMUX_PREFIX}
+exec $_HOST_PKGCONFIG "\$@"
+HERE
+	chmod +x $PKG_CONFIG
+
+	# Add a pkg-config file for the system zlib
+	cat > $PKG_CONFIG_LIBDIR/zlib.pc <<HERE
+Name: zlib
+Description: zlib compression library
+Version: 1.2.3
+
+Requires:
+Libs: -L$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/lib -lz
+Cflags: -I$TERMUX_STANDALONE_TOOLCHAIN/sysroot/usr/include
+HERE
+fi
+
+# Keep track of when build started so we can see what files have been created.
+# We start by sleeping so that any generated files above (such as zlib.pc) get
+# an older timestamp than the TERMUX_BUILD_TS_FILE.
+sleep 1
+TERMUX_BUILD_TS_FILE=$TERMUX_PKG_TMPDIR/timestamp_$TERMUX_PKG_NAME
+touch $TERMUX_BUILD_TS_FILE
+
 # Start by extracting the package src into $TERMUX_PKG_SRCURL:
 termux_step_extract_package
 # Optional post processing:
@@ -807,6 +842,7 @@ HERE
 test ! -z "$TERMUX_PKG_DEPENDS" && echo "Depends: $TERMUX_PKG_DEPENDS" >> DEBIAN/control
 test ! -z "$TERMUX_PKG_ESSENTIAL" && echo "Essential: yes" >> DEBIAN/control
 test ! -z "$TERMUX_PKG_CONFLICTS" && echo "Conflicts: $TERMUX_PKG_CONFLICTS" >> DEBIAN/control
+test ! -z "$TERMUX_PKG_REPLACES" && echo "Replaces: $TERMUX_PKG_REPLACES" >> DEBIAN/control
 
 # Create DEBIAN/conffiles (see https://www.debian.org/doc/debian-policy/ap-pkg-conffiles.html):
 for f in $TERMUX_PKG_CONFFILES; do echo $TERMUX_PREFIX/$f >> DEBIAN/conffiles; done