[RFC PATCH 1/6] vxworks: add target/h/wrn/coreip to the set of system include paths

[Rasmus Villemoes <rasmus dot villemoes at prevas dot dk>]

In order to build crtstuff.c, I need to ensure the headers in
target/h/wrn/coreip are also searched. Of course, that can be done
similar to how wrn/coreip gets manually added for libgcc, e.g. by adding

  CRTSTUFF_T_CFLAGS += -I$(WIND_BASE)/target/h -I$(WIND_BASE)/target/h/wrn/coreip

But without target/h/wrn/coreip in the default search path, all
user-code that include <unistd.h> (crtstuff.c just being one such
example) will have to manually add an -isystem
flag adding the wrn/coreip directory: unistd.h include ioLib.h, which
has

#include "net/uio.h"

and that header is found in target/h/wrn/coreip. In other words, the
VxWorks system headers (at least for VxWorks 5.5) are written in a way
that assumes wrn/coreip is in the search path, so I think it makes sense
to have that by default.

It will change the search order for existing setups that pass
-I.../target/h/wrn/coreip (without -nostdinc), since that flag will now
be ignored. I can't know whether that will break anything, but I do
believe it makes sense to have the defaults actually usable without
expecting all invocations to add -I/-isystem flags.

2018-06-04  Rasmus Villemoes  <rasmus.villemoes@prevas.dk>

gcc/

        * config/vxworks.h: Add $(WIND_BASE)/target/h/wrn/coreip to
          default search path.
---
 gcc/config/vxworks.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/gcc/config/vxworks.h b/gcc/config/vxworks.h
index e37af775157..08d2c9d76d6 100644
--- a/gcc/config/vxworks.h
+++ b/gcc/config/vxworks.h
@@ -61,9 +61,12 @@ along with GCC; see the file COPYING3.  If not see
 #undef VXWORKS_ADDITIONAL_CPP_SPEC
 #define VXWORKS_ADDITIONAL_CPP_SPEC		\
  "%{!nostdinc:					\
-    %{isystem*} -idirafter			\
-    %{mrtp: %:getenv(WIND_USR /h)		\
-      ;:    %:getenv(WIND_BASE /target/h)}}"
+    %{isystem*}					\
+    %{mrtp: -idirafter %:getenv(WIND_USR /h)	\
+	    -idirafter %:getenv(WIND_USR /h/wrn/coreip) \
+      ;:    -idirafter %:getenv(WIND_BASE /target/h) \
+	    -idirafter %:getenv(WIND_BASE /target/h/wrn/coreip) \
+}}"
 
 #endif
 
-- 
2.15.1