Setup system header wrappers for C++ on VxWorks

Starting from VxWorks 7, the system comes with a Dinkumware
environment which requires the inclusion of "yvals.h" before other
system headers.  We provide wrapped versions of a few headers to
accommodate such constraints.

2019-12-30  Jerome Lambourg  <lambourg@adaccore.com>
            Olivier Hainque  <hainque@adacore.com>

	gcc/
	* config/vxworks/_yvals.h: New file.
	* config/vxworks/_yvals-wrapper.h: New file.
	* gcc/config/vxworks/math.h: Use it to wrap the VxWorks
	math.h header.
	* gcc/config/vxworks/complex.h: Likewise.
	* gcc/config/vxworks/setjmp.h: Likewise.
	* gcc/config/vxworks/inttypes.h: Likewise.
	* config.gcc (*-*-vxworks*): Add system header wrappers
	to extra_headers.
	(powerpc-*-vxworks*): Reuse the common extra_headers.

From-SVN: r279784

gcc/ChangeLog

 2019-12-30  Olivier Hainque  <hainque@adacore.com>
 
+	* config/vxworks/_yvals.h: New file.
+	* config/vxworks/_yvals-wrapper.h: New file.
+	* gcc/config/vxworks/math.h: Use it to wrap the VxWorks
+	math.h header.
+	* gcc/config/vxworks/complex.h: Likewise.
+	* gcc/config/vxworks/setjmp.h: Likewise.
+	* gcc/config/vxworks/inttypes.h: Likewise.
+	* config.gcc (*-*-vxworks*): Add system header wrappers
+	to extra_headers.
+	(powerpc-*-vxworks*): Reuse the common extra_headers.
+
+2019-12-30  Olivier Hainque  <hainque@adacore.com>
+
 	* config/vxworks/_vxworks-versions.h: New file.
 	* config.gcc (*-*-vxworks*): Add it to extra_headers.
 

gcc/config.gcc

@@ -953,12 +953,15 @@ case ${target} in
 *-*-vxworks*)
   tmake_file=t-vxworks
   xm_defines=POSIX
+
   extra_options="${extra_options} vxworks.opt"
   extra_objs="$extra_objs vxworks.o"
+
   c_target_objs="${c_target_objs} vxworks-c.o"
   cxx_target_objs="${cxx_target_objs} vxworks-c.o"
   extra_headers="${extra_headers} ../vxworks/vxworks-predef.h"
   target_has_targetcm="yes"
+
   use_gcc_stdint=provide
   tm_file="${tm_file} vxworks-stdint.h"
 
@@ -968,6 +971,17 @@ case ${target} in
 
   extra_headers="${extra_headers} ../vxworks/_vxworks-versions.h"
 
+  # Starting from VxWorks 7, the system comes with a Dinkumware
+  # environment which requires the inclusion of "yvals.h" before other
+  # system headers.  We provide wrapped versions of a few headers to
+  # accomodate such constraints:
+
+  extra_headers="${extra_headers} ../vxworks/_yvals.h"
+  extra_headers="${extra_headers} ../vxworks/_yvals-wrapper.h"
+
+  extra_headers="${extra_headers} ../vxworks/math.h ../vxworks/complex.h"
+  extra_headers="${extra_headers} ../vxworks/inttypes.h ../vxworks/setjmp.h"
+
   case ${enable_threads} in
     no) ;;
     "" | yes | vxworks) thread_file='vxworks' ;;
@@ -2930,7 +2944,7 @@ powerpc-wrs-vxworks*)
 	tm_file="${tm_file} elfos.h gnu-user.h freebsd-spec.h rs6000/sysv4.h"
 	tmake_file="${tmake_file} rs6000/t-fprules rs6000/t-ppccomm rs6000/t-vxworks"
 	extra_options="${extra_options} rs6000/sysv4.opt"
-	extra_headers=ppc-asm.h
+	extra_headers="${extra_headers} ppc-asm.h"
 	case ${target} in
           *-vxworksmils*)
             tm_file="${tm_file} vx-common.h vxworksae.h rs6000/vxworks.h rs6000/vxworksmils.h"