[libgomp, nvptx] Fix libgomp.c/target-5.c compilation

Libgomp test-case libgomp.c/target-5.c is failing to compile when building for
x86_64 with nvptx accelerator due to missing:
- getpid
- gethostname
- isatty (pulled in by fwrite)
in the nvptx newlib.

This patch fixes the build failure by:
- adding a function gomp_print_string which limits the use of fwrite to a single
  location (in affinity-fmt.c), and
- creating an nvptx version of affinity-fmt.c, which:
  - overrides the configure test results HAVE_GETPID and HAVE_GETHOSTNAME, and
  - implements fwrite using write.

Build and reg-tested on x86_64 with nvptx accelerator.

2018-12-13  Tom de Vries  <tdevries@suse.de>

	* affinity-fmt.c (gomp_print_string): New function, factored out of ...
	(omp_display_affinity, gomp_display_affinity_thread): ... here, and ...
	* fortran.c (omp_display_affinity_): ... here.
	* libgomp.h (gomp_print_string): Declare.
	* config/nvptx/affinity-fmt.c: New file.  Include affinity-fmt.c,
	undefining HAVE_GETPID and HAVE_GETHOSTNAME, and mapping fwrite to
	write.

From-SVN: r267100

1 files changed, 2 insertions, 2 deletions

diff --git a/libgomp/fortran.c b/libgomp/fortran.c
index 0157bae..328bf9c 100644
--- a/libgomp/fortran.c
+++ b/libgomp/fortran.c
@@ -626,7 +626,7 @@ omp_display_affinity_ (const char *format, size_t format_len)
   if (ret < sizeof buf)
     {
       buf[ret] = '\n';
-      fwrite (buf, 1, ret + 1, stderr);
+      gomp_print_string (buf, ret + 1);
     }
   else
     {
@@ -635,7 +635,7 @@ omp_display_affinity_ (const char *format, size_t format_len)
 			     format_len ? fmt : gomp_affinity_format_var,
 			     gomp_thread_self (), &thr->ts, thr->place);
       b[ret] = '\n';
-      fwrite (b, 1, ret + 1, stderr);
+      gomp_print_string (b, ret + 1);
       free (b);
     }
   if (fmt && fmt != fmt_buf)