5 files changed, 73 insertions, 1 deletions
diff --git a/usr/src/tools/ctf/cvt/Makefile.com b/usr/src/tools/ctf/cvt/Makefile.com
index 5385b3769f..d909031167 100644
--- a/usr/src/tools/ctf/cvt/Makefile.com
+++ b/usr/src/tools/ctf/cvt/Makefile.com
@@ -32,6 +32,7 @@ PROG=ctfconvert ctfmerge
 
 GENSRCS= \
 	alist.c \
+	altexec.c \
 	barrier.c \
 	ctf.c \
 	fifo.c \
diff --git a/usr/src/tools/ctf/cvt/altexec.c b/usr/src/tools/ctf/cvt/altexec.c
new file mode 100644
index 0000000000..c986c0731a
--- /dev/null
+++ b/usr/src/tools/ctf/cvt/altexec.c
@@ -0,0 +1,45 @@
+/*
+ * This file and its contents are supplied under the terms of the
+ * Common Development and Distribution License ("CDDL"), version 1.0.
+ * You may only use this file in accordance with the terms of version
+ * 1.0 of the CDDL.
+ *
+ * A full copy of the text of the CDDL should have accompanied this
+ * source.  A copy of the CDDL is also available via the Internet at
+ * http://www.illumos.org/license/CDDL.
+ */
+
+/*
+ * Copyright (c) 2015, Joyent, Inc.
+ */
+
+/*
+ * Alternate execution engine for CTF tools
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "ctftools.h"
+
+void
+ctf_altexec(const char *env, int argc, char **argv)
+{
+	const char *alt;
+	char *altexec;
+
+	alt = getenv(env);
+	if (alt == NULL || *alt == '\0')
+		return;
+
+	altexec = strdup(alt);
+	if (altexec == NULL)
+		terminate("failed to allocate memory for altexec\n");
+
+	if (unsetenv(env) != 0)
+		aborterr("failed to remove %s from environment", env);
+
+	(void) execv(altexec, argv);
+	terminate("failed to altexec %s", altexec);
+}
diff --git a/usr/src/tools/ctf/cvt/ctfconvert.c b/usr/src/tools/ctf/cvt/ctfconvert.c
index 36496c5e9d..af005e1934 100644
--- a/usr/src/tools/ctf/cvt/ctfconvert.c
+++ b/usr/src/tools/ctf/cvt/ctfconvert.c
@@ -146,6 +146,7 @@ main(int argc, char **argv)
 {
 	tdata_t *filetd, *mstrtd;
 	char *label = NULL;
+	char *altexec;
 	int verbose = 0;
 	int ignore_non_c = 0;
 	int c;
@@ -156,12 +157,21 @@ main(int argc, char **argv)
 
 	progname = basename(argv[0]);
 
+	ctf_altexec("CTFCONVERT_ALTEXEC", argc, argv);
+
 	if (getenv("CTFCONVERT_DEBUG_LEVEL"))
 		debug_level = atoi(getenv("CTFCONVERT_DEBUG_LEVEL"));
 	if (getenv("CTFCONVERT_DEBUG_PARSE"))
 		debug_parse = atoi(getenv("CTFCONVERT_DEBUG_PARSE"));
 
-	while ((c = getopt(argc, argv, ":l:L:o:ivs")) != EOF) {
+	if ((altexec = getenv("CTFCONVERT_ALTEXEC")) != NULL) {
+		(void) unsetenv("CTFCONVERT_ALTEXEC");
+		(void) execv(altexec, argv);
+		(void) fprintf(stderr, "ctfconvert altexec failed to "
+		    "run %s: %s\n", altexec, strerror(errno));
+	}
+
+	while ((c = getopt(argc, argv, ":l:L:o:givs")) != EOF) {
 		switch (c) {
 		case 'l':
 			label = optarg;
diff --git a/usr/src/tools/ctf/cvt/ctfmerge.c b/usr/src/tools/ctf/cvt/ctfmerge.c
index 5706cceb17..b8053a7a23 100644
--- a/usr/src/tools/ctf/cvt/ctfmerge.c
+++ b/usr/src/tools/ctf/cvt/ctfmerge.c
@@ -745,6 +745,8 @@ main(int argc, char **argv)
 
 	progname = basename(argv[0]);
 
+	ctf_altexec("CTFMERGE_ALTEXEC", argc, argv);
+
 	if (getenv("CTFMERGE_DEBUG_LEVEL"))
 		debug_level = atoi(getenv("CTFMERGE_DEBUG_LEVEL"));
 
diff --git a/usr/src/tools/ctf/cvt/ctftools.h b/usr/src/tools/ctf/cvt/ctftools.h
index 708dfd82ef..755af5176d 100644
--- a/usr/src/tools/ctf/cvt/ctftools.h
+++ b/usr/src/tools/ctf/cvt/ctftools.h
@@ -43,6 +43,17 @@
 extern "C" {
 #endif
 
+/*
+ * XXX: This is hack to deal with GCC 4.x removing __builtin_stdarg_start
+ *
+ * We need to build on systems that don't have the fixed va_impl.h on the
+ * system, to achieve that, we stub it out here and in all similar places to
+ * give us a leg up.
+ */
+#if __GNUC__ >= 4
+#define	__builtin_stdarg_start(list, name)	__builtin_va_start(list, name)
+#endif
+
 #include "list.h"
 #include "hash.h"
 
@@ -441,6 +452,9 @@ void warning(char *, ...);
 void vadebug(int, char *, va_list);
 void debug(int, char *, ...);
 
+/* altexec.c */
+void ctf_altexec(const char *, int argc, char **);
+
 #ifdef __cplusplus
 }
 #endif