[PATCH][libgomp, testsuite] Fix hardcoded libexec in plugin/configfrag.ac

[Tom de Vries via Gcc-patches]

Hi,

When building an nvptx offloading configuration on openSUSE Leap 15.3, the
site script /usr/share/site/x86_64-unknown-linux-gnu is activated, setting
libexecdir to ${exec_prefix}/lib rather than ${exec_prefix}/libexec:
...
| # If user did not specify libexecdir, set the correct target:
| # Nor FHS nor openSUSE allow prefix/libexec. Let's default to prefix/lib.
|
| if test "$libexecdir" = '${exec_prefix}/libexec' ; then
|       libexecdir='${exec_prefix}/lib'
| fi
...

However, in libgomp libgomp/plugin/configfrag.ac we hardcode libexec:
...
    # Configure additional search paths.
    if test x"$tgt_dir" != x; then
      offload_additional_options="$offload_additional_options \
        -B$tgt_dir/libexec/gcc/\$(target_alias)/\$(gcc_version) \
        -B$tgt_dir/bin"
...

Fix this by using /$(libexecdir:\$(exec_prefix)/%=%)/ instead of /libexec/.

Tested on x86_64-linux with nvptx accelerator.

OK for trunk?

Thanks,
- Tom

[libgomp, testsuite] Fix hardcoded libexec in plugin/configfrag.ac

libgomp/ChangeLog:

2022-03-28  Tom de Vries  <tdevr...@suse.de>

        * plugin/configfrag.ac: Use /$(libexecdir:\$(exec_prefix)/%=%)/
        instead of /libexec/.
        * configure: Regenerate.

---
 libgomp/configure            | 2 +-
 libgomp/plugin/configfrag.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/libgomp/configure b/libgomp/configure
index a73a6d44003..bdbe3d142d1 100755
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -15419,7 +15419,7 @@ rm -f core conftest.err conftest.$ac_objext \
     fi
     # Configure additional search paths.
     if test x"$tgt_dir" != x; then
-      offload_additional_options="$offload_additional_options 
-B$tgt_dir/libexec/gcc/\$(target_alias)/\$(gcc_version) -B$tgt_dir/bin"
+      offload_additional_options="$offload_additional_options 
-B$tgt_dir/\$(libexecdir:\$(exec_prefix)/%=%)/gcc/\$(target_alias)/\$(gcc_version)
 -B$tgt_dir/bin"
       
offload_additional_lib_paths="$offload_additional_lib_paths:$tgt_dir/lib64:$tgt_dir/lib:$tgt_dir/lib32"
     else
       offload_additional_options="$offload_additional_options 
-B\$(libexecdir)/gcc/\$(target_alias)/\$(gcc_version) -B\$(bindir)"
diff --git a/libgomp/plugin/configfrag.ac b/libgomp/plugin/configfrag.ac
index da573bd8387..9f9d0a7f08c 100644
--- a/libgomp/plugin/configfrag.ac
+++ b/libgomp/plugin/configfrag.ac
@@ -254,7 +254,7 @@ if test x"$enable_offload_targets" != x; then
     fi
     # Configure additional search paths.
     if test x"$tgt_dir" != x; then
-      offload_additional_options="$offload_additional_options 
-B$tgt_dir/libexec/gcc/\$(target_alias)/\$(gcc_version) -B$tgt_dir/bin"
+      offload_additional_options="$offload_additional_options 
-B$tgt_dir/\$(libexecdir:\$(exec_prefix)/%=%)/gcc/\$(target_alias)/\$(gcc_version)
 -B$tgt_dir/bin"
       
offload_additional_lib_paths="$offload_additional_lib_paths:$tgt_dir/lib64:$tgt_dir/lib:$tgt_dir/lib32"
     else
       offload_additional_options="$offload_additional_options 
-B\$(libexecdir)/gcc/\$(target_alias)/\$(gcc_version) -B\$(bindir)"