Link with the configured net lib on vxworks7

The net library is configurable on vxworks7. Pick the library
to include in link closures in accordance with the availability
of a revealing header file, using the recently introduced
if-exist-then-else spec builtin function.

2021-10-23  Douglas Rupp  <rupp@adacore.com>

gcc/
	* config/vxworks.h (VXWORKS_NET_LIBS_RTP): Use -lrtnet if
	rtnetStackLib.h is available,fallback to -lnet otherwise.

diff --git a/gcc/config/vxworks.h b/gcc/config/vxworks.h
index 5b15380..b7e5970 100644 (file)
--- a/gcc/config/vxworks.h
+++ b/gcc/config/vxworks.h
@@ -90,7 +90,7 @@ along with GCC; see the file COPYING3.  If not see
 #define VXWORKS_SYSCALL_LIBS_RTP
 
 #if TARGET_VXWORKS7
-#define VXWORKS_NET_LIBS_RTP "-lnet"
+#define VXWORKS_NET_LIBS_RTP "-l%:if-exists-then-else(%:getenv(VSB_DIR /usr/h/public/rtnetStackLib.h) rtnet net)"
 #else
 #define VXWORKS_NET_LIBS_RTP "-lnet -ldsi"
 #endif