Fix buildinfo buffer size

Author: vstinner

Modules/getbuildinfo.c

@@ -39,10 +39,14 @@
 #  endif
 #endif
 
+// len(", release+assert+tracerefs+pystats asan msan ubsan lto=thin+pgo framework shared build")
+#define PY_BUILD_STR_MAXLEN 86
+
 static int initialized = 0;
 static char buildinfo[50 + sizeof(GITVERSION) +
                       ((sizeof(GITTAG) > sizeof(GITBRANCH)) ?
-                       sizeof(GITTAG) : sizeof(GITBRANCH))];
+                       sizeof(GITTAG) : sizeof(GITBRANCH))
+                       + PY_BUILD_STR_MAXLEN];
 
 const char *
 Py_GetBuildInfo(void)

configure

@@ -7390,6 +7390,9 @@ AC_SUBST([MODULE_BLOCK])
 # - "debug+tracerefs build"
 # - "release+assert shared build"
 # - "release lto+pgo build"
+#
+#  If the PY_BUILD_STR format changes, PY_BUILD_STR_MAXLEN in
+#  Modules/getbuildinfo.c should be updated.
 AC_SUBST(PY_BUILD_STR)
 if test "$Py_DEBUG" = 'true' ; then
     PY_BUILD_STR="debug"