gnu: mingw: Add mingw-w64 reproducibility patches.

These patches were originally found at the debian mingw-w64 team's
mingw-w64 repo, and should improve the reproducibility of our mingw-w64
toolchain.

* gnu/packages/patches/mingw-w64-dlltool-temp-prefix.patch: New file.
* gnu/packages/patches/mingw-w64-reproducible-gendef.patch: New file.
* gnu/local.mk (dist_patch_DATA): Update accordingly.
* gnu/packages/mingw.scm (make-mingw-w64): Apply patches.

1 files changed, 23 insertions, 0 deletions

diff --git a/gnu/packages/patches/mingw-w64-reproducible-gendef.patch b/gnu/packages/patches/mingw-w64-reproducible-gendef.patch
new file mode 100644
index 0000000000..ee676af7a0
--- /dev/null
+++ b/gnu/packages/patches/mingw-w64-reproducible-gendef.patch
@@ -0,0 +1,23 @@
+This following patch was originally found at the debian mingw-w64 team's
+mingw-w64 repo located here:
+https://salsa.debian.org/mingw-w64-team/mingw-w64.git
+
+Invoke the following in the aforementioned repo to see the original patch:
+
+  $ git show 4974e2c:debian/patches/reproducible-gendef.patch
+
+Description: Drop __DATE__ from gendef
+Author: Stephen Kitt <skitt@debian.org>
+
+This allows gendef to be built reproducibly.
+
+--- a/mingw-w64-tools/gendef/src/gendef.c
++++ b/mingw-w64-tools/gendef/src/gendef.c
+@@ -196,7 +196,6 @@
+                    "  By default, the output files are named after their DLL counterparts\n"
+                    "  gendef MYDLL.DLL     Produces MYDLL.def\n"
+                    "  gendef - MYDLL.DLL   Prints the exports to stdout\n");
+-  fprintf (stderr, "\nBuilt on %s\n", __DATE__);
+   fprintf (stderr, "\nReport bugs to <mingw-w64-public@lists.sourceforge.net>\n");
+   exit (0);
+ }