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/dlltool-temp-prefix.patch

Description: Specify dlltool's temp prefix
Author: Stephen Kitt <steve@sk2.org>

By default dlltool uses its pid for the object files it generates.
Enforcing its temp prefix allows the files it generates to be
reproducible.

--- a/mingw-w64-crt/Makefile.am
+++ b/mingw-w64-crt/Makefile.am
@@ -36,7 +36,7 @@
   DTDEF32=$(GENLIB) $(DLLTOOLFLAGS32) $(AM_DLLTOOLFLAGS)
   DTDEF64=$(GENLIB) $(DLLTOOLFLAGS64) $(AM_DLLTOOLFLAGS)
 else
-  AM_DLLTOOLFLAGS=-k --as=$(AS) --output-lib $@
+  AM_DLLTOOLFLAGS=-k --as=$(AS) --output-lib $@ --temp-prefix $$(basename $@ .a)
   DLLTOOLFLAGSARM32=-m arm
   DLLTOOLFLAGSARM64=-m arm64
   DLLTOOLFLAGS32=--as-flags=--32 -m i386
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<div class='path'>path: <a href='/guix/log/?id=0be4d0947968168cacffe62e2a6fbfea9bee1683'>root</a>/<a href='/guix/log/build-aux?id=0be4d0947968168cacffe62e2a6fbfea9bee1683'>build-aux</a>/<a href='/guix/log/build-aux/cuirass?id=0be4d0947968168cacffe62e2a6fbfea9bee1683'>cuirass</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/build-aux/cuirass?id=0be4d0947968168cacffe62e2a6fbfea9bee1683&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-05-26 11:41:05 +0200'>2022-05-26</span></td><td><a href='/guix/commit/build-aux/cuirass?id=d90bd5642a3663cc7d5124068fadbf8fa28b3207'>cuirass: Create just as many threads as needed.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/cuirass/evaluate.scm (command-line): Change second argument
to 'n-par-for-each'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-26 11:41:05 +0200'>2022-05-26</span></td><td><a href='/guix/commit/build-aux/cuirass?id=98a6642298be6663b9d318b7dea46d1dba275839'>cuirass: Fork inferior processes before creating threads.</a><span class='msg-avail'>...<span class='msg-tooltip'>Works around &lt;https://issues.guix.gnu.org/55441#12&gt;.

Start from commit bd86bbd300474204878e927f6cd3f0defa1662a5,
'open-inferior' uses 'primitive-fork' instead of 'open-pipe*'.  As a
result, child process could potentially hang before calling 'execl' due
to undefined behavior when forking a multi-threaded process.

* build-aux/cuirass/evaluate.scm &lt;top level&gt;: Call 'open-inferior'
before 'n-par-for-each'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-05-20 18:46:07 +0200'>2022-05-20</span></td><td><a href='/guix/commit/build-aux/cuirass?id=598f7289db9955584457ffc11c8504f3938a1618'>cuirass: Close each inferior upon completion.</a><span class='msg-avail'>...<span class='msg-tooltip'>* build-aux/cuirass/evaluate.scm &lt;top level&gt;: Add 'close-inferior' call.
</span></span></td><td>Ludovic Courtès</td></tr>