3 files changed, 214 insertions, 0 deletions

diff --git a/examples/mswin-build/README b/examples/mswin-build/README
new file mode 100644
index 000000000..e1d550d74
--- /dev/null
+++ b/examples/mswin-build/README
@@ -0,0 +1,26 @@
+These scripts can be used to cross-compile busybox-w32 on a
+Fedora Linux system with mingw-w64 and llvm-mingw toolchains.
+The former are available from the Fedora repositories; the
+latter needs to be downloaded and installed from:
+
+   https://github.com/mstorsjo/llvm-mingw
+
+The script should be run from the directory above a git repository
+named busybox-w32.  The builds are performed in the directories
+named in the TARGETS variable in the scripts.  Previous copies of
+these directories are deleted.
+
+The scripts check out the master branch of the git repository.  You
+should edit the script if you wish to build from a different commit.
+
+The build time recorded in the executables is the time of the checked
+out commit.  This may not result in a perfectly reproducible build
+but it's a step in that direction.
+
+The release build performs some additional optimisation and takes
+slightly longer as a result.
+
+The busybox-w32 help message includes information about the build
+platform.  Obtaining this information is very specific to the
+platform used:  you may need to adjust this if building on something
+other than Fedora.
diff --git a/examples/mswin-build/mkprerelease b/examples/mswin-build/mkprerelease
new file mode 100755
index 000000000..7562c8557
--- /dev/null
+++ b/examples/mswin-build/mkprerelease
@@ -0,0 +1,84 @@
+#!/bin/sh
+#
+# Build busybox prerelease binaries
+#
+TARGETS="build_pre_32 build_pre_64 build_pre_64a build_pre_64u"
+
+# 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_64u" ]
+                then
+                        CONFIG=mingw64u_defconfig
+                elif [ $i = "build_pre_64a" ]
+                then
+                        CONFIG=mingw64a_defconfig
+                        PATH="/data2/llvm/current/bin:$PATH"
+                elif [ $i = "build_pre_32" ]
+                then
+                        CONFIG=mingw32_defconfig
+                fi
+
+                cd $i
+                git checkout master
+                SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                        make ${CONFIG}
+        )
+done
+
+# perform build
+for i in $TARGETS
+do
+        BITS=64
+        if [ $i = "build_pre_32" ]
+        then
+                BITS=32;
+        fi
+
+        (
+        cd $i
+        if [ $i = "build_pre_64a" ]
+        then
+                # /data2/llvm/current should be a symlink
+                PATH="/data2/llvm/current/bin:$PATH"
+                VERSION=$(readlink /data2/llvm/current)
+        else
+                GCCV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-gcc)
+                CRTV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-crt)
+                VERSION="$GCCV; $CRTV"
+        fi
+        SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                make -j $(nproc) EXTRAVERSION="-$(git describe --match=FRP | sed 's/FRP/PRE/')" MINGW_VER="$VERSION"
+        )
+done
+
+# Check the expected binaries exist
+echo
+for i in $TARGETS
+do
+        ls -l $i/busybox.exe
+done
diff --git a/examples/mswin-build/mkrelease b/examples/mswin-build/mkrelease
new file mode 100755
index 000000000..2f59dce13
--- /dev/null
+++ b/examples/mswin-build/mkrelease
@@ -0,0 +1,104 @@
+#!/bin/sh
+#
+# Build 32- and 64-bit busybox binaries for release
+#
+TARGETS="build_32 build_64 build_64a build_64u"
+
+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
+        (
+                if [ $i = "build_64" ]
+                then
+                        CONFIG=mingw64_defconfig
+                        BITS=64
+                elif [ $i = "build_64a" ]
+                then
+                        PATH="/data2/llvm/current/bin:$PATH"
+                        CONFIG=mingw64a_defconfig
+                        BITS=64
+                elif [ $i = "build_64u" ]
+                then
+                        CONFIG=mingw64u_defconfig
+                        BITS=64
+                elif [ $i = "build_32" ]
+                then
+                        CONFIG=mingw32_defconfig
+                        BITS=32
+                fi
+
+                cd $i
+                git checkout master
+                SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                        make ${CONFIG}
+
+                # The clang/aarch64 build is not subject to optimisation.  The
+                # '-flto' option increased the size of the binary slightly (0.23%)
+                # and decreased the time to run the testsuite slightly (0.33%).
+                # It hardly seems worth bothering about.
+                #
+                if [ $i != "build_64a" ]
+                then
+                        # link time optimisation, 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
+                fi
+        )
+done
+
+# perform build
+for i in $TARGETS
+do
+        BITS=64
+        if [ $i = "build_32" ]
+        then
+                BITS=32
+        fi
+
+        (
+        cd $i
+        if [ $i = "build_64a" ]
+        then
+                # /data2/llvm/current should be a symlink
+                PATH="/data2/llvm/current/bin:$PATH"
+                VERSION=$(readlink /data2/llvm/current)
+        else
+                GCCV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-gcc)
+                CRTV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-crt)
+                VERSION="$GCCV; $CRTV"
+        fi
+        SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                make -j $(nproc) EXTRAVERSION="-`git describe --match=FRP`" MINGW_VER="$VERSION"
+        )
+done
+
+# Check the expected binaries exist
+echo
+for i in $TARGETS
+do
+        ls -l $i/busybox.exe
+done