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=7e056197d7bf8f888fe52db9d5ee34ec253ffff9'>root</a>/<a href='/guix/log/etc?id=7e056197d7bf8f888fe52db9d5ee34ec253ffff9'>etc</a>/<a href='/guix/log/etc/time-travel-manifest.scm?id=7e056197d7bf8f888fe52db9d5ee34ec253ffff9'>time-travel-manifest.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/etc/time-travel-manifest.scm?id=7e056197d7bf8f888fe52db9d5ee34ec253ffff9&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2022-08-17 15:42:56 +0200'>2022-08-17</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=845c841e21379e64a4215ee6d3d60da343e7fb93'>time-travel-manifest: Use a separate cache per system.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (&lt;guix-instance-compiler&gt;): Use a separate
cache per system so that parallel system evaluations do no step on each
other's toes.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2022-07-10 23:57:14 +0200'>2022-07-10</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=5d0437ea8ce0147b47b9df866fa2413b48f71a1a'>time-travel-manifest: Use a separate Git checkout cache.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/time-travel-manifest.scm (guix-instance-compiler): Parameterize
%REPOSITORY-CACHE-DIRECTORY.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2022-07-08 23:58:11 +0200'>2022-07-08</span></td><td><a href='/guix/commit/etc/time-travel-manifest.scm?id=e80f0cda96181d90604c44f69094f2499036b3f6'>etc: Add 'time-travel-manifest.scm'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This manifest makes it easy to test travels from the current revision
back to the revision of a past Guix release.

Suggested by zimoun &lt;zimon.toutoune@gmail.com&gt;.

* etc/time-travel-manifest.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.
</span></span></td><td>Ludovic Courtès</td></tr>