[Rpm-maint] [rpm-software-management/rpm] Enhance requires with version information from the build root. (PR #2372)

[Panu Matilainen]

@pmatilai commented on this pull request.



> +    if (pipe(pipefd) == -1) {
+	return NULL;  // Should this be a fatal error instead?
+    }
+    cpid = fork();
+    if (cpid == -1) {
+	return NULL;  // Should this be a fatal error instead?
+    }
+    if (cpid == 0) {
+	void *dl_handle;
+	struct link_map *linkmap;
+	char *version = NULL;
+
+	close(pipefd[0]);
+	dl_handle = dlmopen(LM_ID_NEWLM, filename, RTLD_LAZY);
+	if (dl_handle == NULL) _exit(0);
+	if (dlinfo(dl_handle, RTLD_DI_LINKMAP, &linkmap) != -1) {

Sadly both dlinfo() and dlmopen() are GNU extensions, so these need to be checked for in cmake and this works made conditional on their availability.

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