gnu: strace: Fix test failures on some systems.

* gnu/packages/patches/strace-ipc-tests.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/linux.scm (strace)[source](patches): New field.
[arguments]: Add 'regenerate-tests' phase.

Co-Authored-By: Mark H Weaver <mhw@netris.org>

gnu/local.mk

@@ -1305,6 +1305,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/soundconverter-remove-gconf-dependency.patch	\
   %D%/packages/patches/sssd-curl-compat.patch			\
   %D%/packages/patches/steghide-fixes.patch			\
+  %D%/packages/patches/strace-ipc-tests.patch			\
   %D%/packages/patches/streamlink-update-test.patch		\
   %D%/packages/patches/stumpwm-fix-broken-read-one-line.patch	\
   %D%/packages/patches/superlu-dist-awpm-grid.patch		\

gnu/packages/linux.scm

@@ -1408,6 +1408,9 @@ Zerofree requires the file system to be unmounted or mounted read-only.")
              (method url-fetch)
              (uri (string-append home-page "/files/" version
                                  "/strace-" version ".tar.xz"))
+             ;; XXX Remove the 'regenerate-tests' phase below when
+             ;; "strace-ipc-tests.patch" is no longer applied.
+             (patches (search-patches "strace-ipc-tests.patch"))
              (sha256
               (base32
                "1li49i75wrdw91hchyyd8spnzfcmxcfyfb5g9zbaza89aq4bq4ym"))))
@@ -1419,7 +1422,14 @@ Zerofree requires the file system to be unmounted or mounted read-only.")
            (lambda _
              (substitute* "strace.c"
                (("/bin/sh") (which "sh")))
-             #t)))
+             #t))
+         (add-before 'configure 'regenerate-tests
+           ;; XXX Remove this phase when "strace-ipc-tests.patch" is no longer
+           ;; applied in the 'source' field above.  This phase is needed to
+           ;; regenerate many other files from tests/gen_tests.in, which is
+           ;; modified by the aforementioned patch.
+           (lambda _
+             (invoke "tests/gen_tests.sh"))))
        ;; Don't fail if the architecture doesn't support different personalities.
        #:configure-flags '("--enable-mpers=check")
        ;; See <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32459>.

gnu/packages/patches/strace-ipc-tests.patch

@@ -0,0 +1,30 @@
+Fix a test failure on some systems.
+
+Taken from upstream:
+https://github.com/strace/strace/commit/4377e3a1535a0ec3a42da8a1366ad6943f4efa0e
+
+diff --git a/tests/gen_tests.in b/tests/gen_tests.in
+index 4a506b94c..4fdf4722c 100644
+--- a/tests/gen_tests.in
++++ b/tests/gen_tests.in
+@@ -168,16 +168,16 @@ ipc_msg-Xabbrev	+ipc.sh -Xabbrev -a26
+ ipc_msg-Xraw	+ipc.sh -Xraw -a16
+ ipc_msg-Xverbose	+ipc.sh -Xverbose -a34
+ ipc_msgbuf-Xabbrev	+ipc_msgbuf.test -Xabbrev
+-ipc_msgbuf-Xraw	+ipc_msgbuf.test -Xraw -a22
++ipc_msgbuf-Xraw	+ipc_msgbuf.test -Xraw -a20
+ ipc_msgbuf-Xverbose	+ipc_msgbuf.test -Xverbose
+ ipc_sem	+ipc.sh -a29
+ ipc_sem-Xabbrev	+ipc.sh -Xabbrev -a29
+ ipc_sem-Xraw	+ipc.sh -Xraw -a19
+ ipc_sem-Xverbose	+ipc.sh -Xverbose -a36
+-ipc_shm	+ipc.sh -a29
+-ipc_shm-Xabbrev	+ipc.sh -Xabbrev -a29
++ipc_shm	+ipc.sh -a26
++ipc_shm-Xabbrev	+ipc.sh -Xabbrev -a26
+ ipc_shm-Xraw	+ipc.sh -Xraw -a19
+-ipc_shm-Xverbose	+ipc.sh -Xverbose -a36
++ipc_shm-Xverbose	+ipc.sh -Xverbose -a34
+ kcmp	-a22
+ kcmp-y	-a22 -y -e trace=kcmp
+ kern_features -a16