From 0b6aed138649cb843cbbdfe2ca5ff5e56f3a0825 Mon Sep 17 00:00:00 2001
From: Ron Yorston <rmy@pobox.com>
Date: Sun, 4 Jun 2023 10:56:34 +0100
Subject: Example build scripts

Supply the scripts used to build release and prerelease busybox-w32.

(GitHub issue #330)
---
 examples/mswin-build/README       |  6 ++++
 examples/mswin-build/mkprerelease | 48 +++++++++++++++++++++++++++
 examples/mswin-build/mkrelease    | 70 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 124 insertions(+)
 create mode 100644 examples/mswin-build/README
 create mode 100755 examples/mswin-build/mkprerelease
 create mode 100755 examples/mswin-build/mkrelease

diff --git a/examples/mswin-build/README b/examples/mswin-build/README
new file mode 100644
index 000000000..57a13d8d5
--- /dev/null
+++ b/examples/mswin-build/README
@@ -0,0 +1,6 @@
+These are the scripts used to cross-compile busybox-w32.
+
+The release build performs some additional optimisation and is
+slightly slower as a result.  It also includes information about
+the build platform in the help message.  This assumes the build is
+done on a Fedora Linux system.
diff --git a/examples/mswin-build/mkprerelease b/examples/mswin-build/mkprerelease
new file mode 100755
index 000000000..ea98785d7
--- /dev/null
+++ b/examples/mswin-build/mkprerelease
@@ -0,0 +1,48 @@
+#!/bin/sh
+#
+# Build busybox prerelease binaries
+#
+TARGETS="build_pre_32 build_pre_64"
+
+# If an argument is supplied it overrides the default source directory.
+SRC=busybox-w32
+if [ $# -eq 1 ]
+then
+	SRC=$1
+fi
+
+if [ ! -d $SRC ]
+then
+	echo "$SRC doesn't exist"
+	exit 0
+fi
+
+# remove old and make new build directories
+for i in $TARGETS
+do
+	rm -rf $i
+	cp -rp $SRC $i
+done
+
+# apply default configuration
+for i in $TARGETS
+do
+	if [ $i = "build_pre_64" ]
+	then
+		CONFIG=mingw64_defconfig;
+	elif [ $i = "build_pre_32" ]
+	then
+		CONFIG=mingw32_defconfig;
+	fi
+
+	(cd $i; git checkout master; make ${CONFIG})
+done
+
+# perform build
+for i in $TARGETS
+do
+	(
+	cd $i
+	make -j $(nproc) EXTRAVERSION="-$(git describe --match=FRP | sed 's/FRP/PRE/')"
+	)
+done
diff --git a/examples/mswin-build/mkrelease b/examples/mswin-build/mkrelease
new file mode 100755
index 000000000..7ce9094f6
--- /dev/null
+++ b/examples/mswin-build/mkrelease
@@ -0,0 +1,70 @@
+#!/bin/sh
+#
+# Build 32- and 64-bit busybox binaries for release
+#
+TARGETS="build_32 build_64"
+
+if [ ! -d busybox-w32 ]
+then
+	echo "busybox-w32 doesn't exist"
+	exit 0
+fi
+
+# remove old and make new build directories
+for i in $TARGETS
+do
+	rm -rf $i
+	cp -rp busybox-w32 $i
+done
+
+# apply default configuration
+for i in $TARGETS
+do
+	BITS=32
+	if [ $i = "build_64" ]
+	then
+		BITS=64;
+	fi
+
+	(
+		cd $i
+		make mingw${BITS}_defconfig
+		# link time optimisation, fortify, stack protection
+		sed -e 's/^CONFIG_EXTRA_CFLAGS="\(.*\)"$/CONFIG_EXTRA_CFLAGS="\1 -flto -fstack-protector --param=ssp-buffer-size=4"/' \
+			-e 's/^CONFIG_EXTRA_CFLAGS=" /CONFIG_EXTRA_CFLAGS="/' \
+			-e 's/^CONFIG_EXTRA_LDLIBS="\(.*\)"$/CONFIG_EXTRA_LDLIBS="\1 -l:libssp.a"/' \
+			-e 's/^CONFIG_EXTRA_LDLIBS=" /CONFIG_EXTRA_LDLIBS="/' \
+			-i .config 
+		# does ld support --disable-reloc-section?
+		eval $(grep CONFIG_CROSS_COMPILER_PREFIX .config)
+		[ $BITS -eq 32 ] && [ -n "$CONFIG_CROSS_COMPILER_PREFIX" ] && \
+			${CONFIG_CROSS_COMPILER_PREFIX}ld --help | \
+				grep -q disable-reloc-section &&
+					sed -e 's/^CONFIG_EXTRA_LDFLAGS="\(.*\)"$/CONFIG_EXTRA_LDFLAGS="\1 -Wl,--disable-reloc-section"/' \
+						-e 's/^CONFIG_EXTRA_LDFLAGS=" /CONFIG_EXTRA_LDFLAGS="/' \
+						-i .config
+	)
+done
+
+# perform build
+for i in $TARGETS
+do
+	BITS=32
+	if [ $i = "build_64" ]
+	then
+		BITS=64;
+	fi
+
+	(
+	cd $i
+	GCCV=`rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-gcc`
+	CRTV=`rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-crt`
+	GLOB="; noglob"
+	if grep -q ^CONFIG_GLOBBING=y .config
+	then
+		GLOB="; glob"
+	fi
+	VER="($GCCV; $CRTV$GLOB)"
+	make -j $(nproc) EXTRAVERSION="-`git describe --match=FRP`" MINGW_VER="$VER"
+	)
+done
-- 
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