[libgomp, nvptx] Print error log for link error

By running libgomp test-case libgomp.c/target-28.c with GOMP_NVPTX_PTXRW=w
(using a maintenance patch that adds support for this env var), we dump the
ptx in target-28.exe to file.  By editing one ptx file to rename
gomp_nvptx_main to gomp_nvptx_main2 in both declaration and call, and
running with GOMP_NVPTX_PTXRW=r, we trigger a link error:
...
$ GOMP_NVPTX_PTXRW=r ./target-28.exe
libgomp: cuLinkComplete error: unknown error
...
The error is somewhat uninformative.

Fix this by dumping the error log returned by the failing cuda call, such
that we have instead:
...
$ GOMP_NVPTX_PTXRW=r ./target-28.exe
libgomp: Link error log error   : \
  Undefined reference to 'gomp_nvptx_main2' in ''
libgomp: cuLinkComplete error: unknown error
...

Build on x86_64 with nvptx accelerator, tested libgomp.

libgomp/ChangeLog:

	* plugin/plugin-nvptx.c (link_ptx): Print elog if cuLinkComplete call
	fails.

1 files changed, 1 insertions, 0 deletions

diff --git a/libgomp/plugin/plugin-nvptx.c b/libgomp/plugin/plugin-nvptx.c
index 390804a..a63dd1a 100644
--- a/libgomp/plugin/plugin-nvptx.c
+++ b/libgomp/plugin/plugin-nvptx.c
@@ -701,6 +701,7 @@ link_ptx (CUmodule *module, const struct targ_ptx_obj *ptx_objs,
 
   if (r != CUDA_SUCCESS)
     {
+      GOMP_PLUGIN_error ("Link error log %s\n", &elog[0]);
       GOMP_PLUGIN_error ("cuLinkComplete error: %s", cuda_error (r));
       return false;
     }