Check the runtime version of PMIx

src/runtime/prte_init.c

@@ -38,6 +38,9 @@
 #ifdef HAVE_SYS_STAT_H
 #    include <sys/stat.h>
 #endif
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
 
 #include "src/util/error.h"
 #include "src/util/error_strings.h"
@@ -127,16 +130,53 @@ static bool check_exist(char *path)
     return false;
 }
 
+static void print_error(unsigned major,
+                        unsigned minor,
+                        unsigned release)
+{
+    fprintf(stderr, "************************************************\n");
+    fprintf(stderr, "We have detected that the runtime version\n");
+    fprintf(stderr, "of the PMIx library we were given is binary\n");
+    fprintf(stderr, "incompatible with the version we were built against:\n\n");
+    fprintf(stderr, "    Runtime: 0x%x%02x%02x\n", major, minor, release);
+    fprintf(stderr, "    Build:   0x%0x\n\n", PMIX_NUMERIC_VERSION);
+    fprintf(stderr, "Please update your LD_LIBRARY_PATH to point\n");
+    fprintf(stderr, "us to the same PMIx version used to build PRRTE.\n");
+    fprintf(stderr, "************************************************\n");
+}
+
 int prte_init_minimum(void)
 {
     int ret;
     char *path = NULL;
+    const char *rvers;
+    char token[100];
+    unsigned int major, minor, release;
 
     if (min_initialized) {
         return PRTE_SUCCESS;
     }
     min_initialized = true;
 
+    /* check to see if the version of PMIx we were given in the
+     * library path matches the version we were built against.
+     * Because we are using PMIx internals, we cannot support
+     * cross version operations from inside of PRRTE.
+     */
+    rvers = PMIx_Get_version();
+    ret = sscanf(rvers, "%s %u.%u.%u", token, &major, &minor, &release);
+
+    /* check the version triplet - we know that version
+     * 5 and above are not runtime compatible with version
+     * 4 and below. Since PRRTE has a minimum PMIx requirement
+     * in the v4.x series, we only need to check v4 vs 5
+     * and above */
+    if ((PMIX_VERSION_MAJOR > 4 && 4 == major) ||
+        (PMIX_VERSION_MAJOR == 4 && 5 <= major)) {
+        print_error(major, minor, release);
+        return PRTE_ERR_SILENT;
+    }
+
     /* carry across the toolname */
     pmix_tool_basename = prte_tool_basename;