testsuite, gm2: Use -B option for libstdc++ where required.

We need to add testsuite  options to locate gm2 libs and libstdc++.

Usually '-L' options are added to point to the relevant directories for
the uninstalled libraries.

In cases where libraries are available as both shared and convenience some
additional checks are made.

For some targets -static-xxxx options are handled by specs substitution and
need a '-B' option rather than '-L'.  For Darwin, when embedded runpaths are
in use (the default for all versions after macOS 10.11), '-B' is also needed
to provide the runpath.

When '-B' is used, this results in a '-L' for each path that exists (so that
appending a '-L' as well is a needless duplicate).  There are also cases
where tools warn for duplicates, leading to spurious fails.

Therefore the objective of the code here is to add just one '-L' or '-B' for
each of the libraries.

Currently, we are forcing the full paths to each of the gm2 convenience libs
onto the link line and therefore the B/L logic is not needed there.  It would
need to be added if/when gm2 is tested with shared libraries

gcc/testsuite/ChangeLog:

	* lib/gm2.exp: Arrange for a '-B' option to be added for the
	libstdc++ paths on targets that need it.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>

1 files changed, 36 insertions, 10 deletions

diff --git a/gcc/testsuite/lib/gm2.exp b/gcc/testsuite/lib/gm2.exp
index f7d42a1..5760bc0 100644
--- a/gcc/testsuite/lib/gm2.exp
+++ b/gcc/testsuite/lib/gm2.exp
@@ -254,12 +254,35 @@ proc gm2_link_flags { paths } {
     if [istarget "powerpc-*-*"] {
        lappend flags "-mabi=ieeelongdouble"
     }
+
+    # We need to add options to locate gm2 libs and libstdc++
+    # Usually '-L' options are added to point to the relevant directories for
+    # the uninstalled libraries.
+
+    # In cases where libraries are available as both shared and convenience
+    # some additional checks are made.
+
+    # For some targets -static-xxxx options are handled by specs substitution
+    # and need a '-B' option rather than '-L'.  For Darwin, when embedded
+    # runpaths are in use (the default for all versions after macOS 10.11),
+    # '-B' is also needed to provide the runpath.
+    # When '-B' is used, this results in a '-L' for each path that exists (so
+    # that appending a '-L' as well is a needless duplicate).  There are also
+    # cases where tools warn for duplicates, leading to spurious fails.
+    # Therefore the objective of the code below is to add just one '-L' or
+    # '-B' for each of the libraries.
+
+    set target_wants_B_option 0
+    if { [istarget *-*-darwin9* ] || [istarget *-*-darwin\[12\]* ] } {
+      set target_wants_B_option 1
+    }
+
     if { $gccpath == "" } {
       global tool_root_dir
 
       set libstdcpp [lookfor_file ${tool_root_dir} libstdc++]
       if { $libstdcpp != "" } {
-          append flags "-L${libstdcpp} "
+          append flags " -L${libstdcpp} "
           append ld_library_path ":${libstdcpp}"
       }
     } else {
@@ -267,19 +290,22 @@ proc gm2_link_flags { paths } {
 	    append ld_library_path ":${gccpath}/lib"
 	}
 	if [file exists "${gccpath}/libstdc++/libstdc++.a"] {
-	    append flags "-L${gccpath}/libstdc++ "
+	    append flags " -L${gccpath}/libstdc++ "
 	    append ld_library_path ":${gccpath}/libstdc++"
 	}
-	if [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.a"] {
-	    append flags " -L${gccpath}/libstdc++-v3/src/.libs "
-	    append ld_library_path ":${gccpath}/libstdc++-v3/src/.libs"
-	}
-	# Look for libstdc++.${shlib_ext}.
-	if [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.${shlib_ext}"] {
-	    append flags " -L${gccpath}/libstdc++-v3/src/.libs "
+	# Look for libstdc++.<a,${shlib_ext}>.
+        if { [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.a"] \
+	     || [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.${shlib_ext}"] } {
+            if { $target_wants_B_option } {
+	        append flags " -B${gccpath}/libstdc++-v3/src/.libs "
+            } else {
+	        append flags " -L${gccpath}/libstdc++-v3/src/.libs "
+            }
 	    append ld_library_path ":${gccpath}/libstdc++-v3/src/.libs"
 	}
 
+	# Here we are forcing the static libraries, with complete paths so 
+	# there's no -L/-B logic needed
 	# puts stderr "${gm2_link_libraries}  before foreach"
 	foreach d [list {*}${gm2_link_libraries}] {
 	    # puts stderr "${d}  XXXX"
@@ -288,7 +314,7 @@ proc gm2_link_flags { paths } {
 	    if [file exists "${gccpath}/libgm2/lib${d}/.libs/lib${d}.a"] {
 		send_log "good found ${gccpath}/libgm2/lib${d}/.libs/lib${d}.a\n"
 		# append flags " -L${gccpath}/libgm2/lib${d}/.libs -l${d}"
-		append flags " ${gccpath}/libgm2/lib${d}/.libs/lib${d}.a"
+		append flags " ${gccpath}/libgm2/lib${d}/.libs/lib${d}.a "
 		append ld_library_path ":${gccpath}/libgm2/lib${d}/.libs"
 	    }
 	    send_log "ld_library_path is ${ld_library_path}\n"