1 files changed, 36 insertions, 2 deletions

diff --git a/usr/src/lib/libdtrace/common/dt_cc.c b/usr/src/lib/libdtrace/common/dt_cc.c
index d972aba4f7..56ea585320 100644
--- a/usr/src/lib/libdtrace/common/dt_cc.c
+++ b/usr/src/lib/libdtrace/common/dt_cc.c
@@ -1927,12 +1927,13 @@ static int
 dt_load_libs_dir(dtrace_hdl_t *dtp, const char *path)
 {
 	struct dirent *dp;
-	const char *p;
+	const char *p, *end;
 	DIR *dirp;
 
 	char fname[PATH_MAX];
 	FILE *fp;
 	void *rv;
+	dt_lib_depend_t *dld;
 
 	if ((dirp = opendir(path)) == NULL) {
 		dt_dprintf("skipping lib dir %s: %s\n", path, strerror(errno));
@@ -1953,6 +1954,25 @@ dt_load_libs_dir(dtrace_hdl_t *dtp, const char *path)
 			continue;
 		}
 
+		/*
+		 * Skip files whose name match an already processed library
+		 */
+		for (dld = dt_list_next(&dtp->dt_lib_dep); dld != NULL;
+		    dld = dt_list_next(dld)) {
+			end = strrchr(dld->dtld_library, '/');
+			/* dt_lib_depend_add ensures this */
+			assert(end != NULL);
+			if (strcmp(end + 1, dp->d_name) == 0)
+				break;
+		}
+
+		if (dld != NULL) {
+			dt_dprintf("skipping library %s, already processed "
+			    "library with the same name: %s", dp->d_name,
+			    dld->dtld_library);
+			continue;
+		}
+
 		dtp->dt_filetag = fname;
 		if (dt_lib_depend_add(dtp, &dtp->dt_lib_dep, fname) != 0)
 			return (-1); /* preserve dt_errno */
@@ -2056,7 +2076,14 @@ dt_load_libs(dtrace_hdl_t *dtp)
 
 	dtp->dt_cflags |= DTRACE_C_NOLIBS;
 
-	for (dirp = dt_list_next(&dtp->dt_lib_path);
+	/*
+	 * /usr/lib/dtrace is always at the head of the list. The rest of the
+	 * list is specified in the precedence order the user requested. Process
+	 * everything other than the head first. DTRACE_C_NOLIBS has already
+	 * been spcified so dt_vopen will ensure that there is always one entry
+	 * in dt_lib_path.
+	 */
+	for (dirp = dt_list_next(dt_list_next(&dtp->dt_lib_path));
 	    dirp != NULL; dirp = dt_list_next(dirp)) {
 		if (dt_load_libs_dir(dtp, dirp->dir_path) != 0) {
 			dtp->dt_cflags &= ~DTRACE_C_NOLIBS;
@@ -2064,6 +2091,13 @@ dt_load_libs(dtrace_hdl_t *dtp)
 		}
 	}
 
+	/* Handle /usr/lib/dtrace */
+	dirp = dt_list_next(&dtp->dt_lib_path);
+	if (dt_load_libs_dir(dtp, dirp->dir_path) != 0) {
+		dtp->dt_cflags &= ~DTRACE_C_NOLIBS;
+		return (-1); /* errno is set for us */
+	}
+
 	if (dt_load_libs_sort(dtp) < 0)
 		return (-1); /* errno is set for us */