3 files changed, 25 insertions, 7 deletions

diff --git a/examples/mswin-build/README b/examples/mswin-build/README
index 41cd6ebb2..e1d550d74 100644
--- a/examples/mswin-build/README
+++ b/examples/mswin-build/README
@@ -5,9 +5,22 @@ latter needs to be downloaded and installed from:
 
    https://github.com/mstorsjo/llvm-mingw
 
-The release build performs some additional optimisation and is
-slightly slower as a result.
+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.
+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
index 1bdf886d9..7562c8557 100755
--- a/examples/mswin-build/mkprerelease
+++ b/examples/mswin-build/mkprerelease
@@ -45,7 +45,8 @@ do
 
                 cd $i
                 git checkout master
-                make ${CONFIG}
+                SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                        make ${CONFIG}
         )
 done
 
@@ -70,7 +71,8 @@ do
                 CRTV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-crt)
                 VERSION="$GCCV; $CRTV"
         fi
-        make -j $(nproc) EXTRAVERSION="-$(git describe --match=FRP | sed 's/FRP/PRE/')" MINGW_VER="$VERSION"
+        SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                make -j $(nproc) EXTRAVERSION="-$(git describe --match=FRP | sed 's/FRP/PRE/')" MINGW_VER="$VERSION"
         )
 done
 
diff --git a/examples/mswin-build/mkrelease b/examples/mswin-build/mkrelease
index 6dfd6c87e..2f59dce13 100755
--- a/examples/mswin-build/mkrelease
+++ b/examples/mswin-build/mkrelease
@@ -41,7 +41,9 @@ do
                 fi
 
                 cd $i
-                make ${CONFIG}
+                git checkout master
+                SOURCE_DATE_EPOCH=$(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%)
@@ -89,7 +91,8 @@ do
                 CRTV=$(rpm -q --qf '%{name} %{version}-%{release}\n' mingw${BITS}-crt)
                 VERSION="$GCCV; $CRTV"
         fi
-        make -j $(nproc) EXTRAVERSION="-`git describe --match=FRP`" MINGW_VER="$VERSION"
+        SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) TZ=UTC0 \
+                make -j $(nproc) EXTRAVERSION="-`git describe --match=FRP`" MINGW_VER="$VERSION"
         )
 done