If the size of int is different from IGRAPH_INTEGER_SIZE, the integer size
passed to these vararg arguments is different from the assumed one,
leading to undefined behavior.
Submitted upstream: https://github.com/igraph/igraph/pull/2423


diff -ur a/examples/simple/igraph_union.c b/examples/simple/igraph_union.c
--- a/examples/simple/igraph_union.c
+++ b/examples/simple/igraph_union.c
@@ -103,7 +103,7 @@
     igraph_vector_ptr_init(&glist, 10);
     for (i = 0; i < igraph_vector_ptr_size(&glist); i++) {
         VECTOR(glist)[i] = calloc(1, sizeof(igraph_t));
-        igraph_vector_int_init_int_end(&v, -1, i, i + 1, 1, 0, -1);
+        igraph_vector_int_init_int_end(&v, -1, (int) i, (int) i + 1, 1, 0, -1);
         igraph_create(VECTOR(glist)[i], &v, 0, IGRAPH_DIRECTED);
         igraph_vector_int_destroy(&v);
     }
@@ -123,7 +123,7 @@
     igraph_vector_ptr_init(&glist, 10);
     for (i = 0; i < igraph_vector_ptr_size(&glist); i++) {
         VECTOR(glist)[i] = calloc(1, sizeof(igraph_t));
-        igraph_vector_int_init_int_end(&v, -1, i, i + 1, 1, 0, -1);
+        igraph_vector_int_init_int_end(&v, -1, (int) i, (int) i + 1, 1, 0, -1);
         igraph_create(VECTOR(glist)[i], &v, 0, IGRAPH_UNDIRECTED);
         igraph_vector_int_destroy(&v);
     }
diff -ur a/src/core/matrix.pmt b/src/core/matrix.pmt
--- a/src/core/matrix.pmt
+++ b/src/core/matrix.pmt
@@ -1863,7 +1863,7 @@
 #ifdef FPRINTFUNC_ALIGNED
             FPRINTFUNC_ALIGNED(file, VECTOR(column_width)[j], MATRIX(*m, i, j));
 #else
-            fprintf(file, format, VECTOR(column_width)[j], MATRIX(*m, i, j));
+            fprintf(file, format, (int) VECTOR(column_width)[j], MATRIX(*m, i, j));
 #endif
         }
         fprintf(file, "\n");
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<div class='path'>path: <a href='/guix/log/?id=d627fbad8f4e157103251b07d7543dd2f5647cea'>root</a>/<a href='/guix/log/gnu?id=d627fbad8f4e157103251b07d7543dd2f5647cea'>gnu</a>/<a href='/guix/log/gnu/tests?id=d627fbad8f4e157103251b07d7543dd2f5647cea'>tests</a>/<a href='/guix/log/gnu/tests/messaging.scm?id=d627fbad8f4e157103251b07d7543dd2f5647cea'>messaging.scm</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/gnu/tests/messaging.scm?id=d627fbad8f4e157103251b07d7543dd2f5647cea&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-09-26 23:20:56 +0200'>2021-09-26</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=89b05442933d92f4b21c3294455a498e8333727d'>tests: Reduce boilerplate for users of 'system-test-runner'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2021-09-25 18:52:05 +0200'>2021-09-25</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=1fb75128a5202b406622da6272bc809c46d1f439'>tests: Adjust to SRFI-64 as found in Guile 3.0.7.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-12-24 11:18:36 +0200'>2018-12-24</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=dcad57d5fca43a111e1b314264171c80d4d9a75b'>services: Add quassel.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-10-18 01:12:22 +0200'>2018-10-18</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=39d7fdce453b0ca23ecbed72048647debbaa58a6'>services: dhcp-client: Deprecate 'dhcp-client-service' procedure.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2018-06-13 09:11:45 +0200'>2018-06-13</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=c24b15472baaa7ec67d48cbf296bbe5ab727b78f'>tests: Honor the return value of 'start-service'.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2018-01-15 23:29:34 +0100'>2018-01-15</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=c1816361ad1390d6bea0fbe8f738c07b966a4605'>services: bitlbee: Add test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-11-26 15:32:16 +0100'>2017-11-26</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=5c22f3726e6a3e44792fd44f7b42122194a16f35'>tests: messaging: Enable Prosody DIGEST-MD5 auth mechanism.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2017-07-20 11:57:13 +0200'>2017-07-20</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=8b113790fa3bfd2300c737901ba161f079fedbdf'>tests: Use 'virtual-machine' records instead of monadic procedures.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-06-12 23:34:14 +0200'>2017-06-12</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=5fa7cc5335d64a790d7f0f784a11b25b040cc443'>marionette: Factorize 'wait-for-file'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-01 00:45:18 +0200'>2017-04-01</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=892d9089a88abaa2ef1127f16308d03f4f08a4ce'>tests: Introduce 'simple-operating-system' and use it.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-02-10 23:39:45 +0100'>2017-02-10</span></td><td><a href='/guix/commit/gnu/tests/messaging.scm?id=533bc51469bf291ac935a463bcbd8fdb93b5976c'>tests: Add 'prosody-service-type' test.</a><span class='msg-avail'>...</span></td><td>Clément Lassieur</td></tr>