xfail gdb.base/break-on-linker-gcd-function.exp with Solaris ld [PR34534]

As detailed in PR testsuite/34534, a test FAILs on Solaris when using
the native ld:

FAIL: gdb.base/break-on-linker-gcd-function.exp: break on line in garbage collected function
FAIL: gdb.base/break-on-linker-gcd-function.exp: readnow: break on line in garbage collected function

Even though ld supports --gc-sections as an alias for the native -z
discard-unused=sections, this doesn't work in this particular case.
While the issue is under investigation, this patch xfail's the test when
Solaris ld is in use.

Approved-By: Tom Tromey <tom@tromey.com>
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=34534

gdb/testsuite/gdb.base/break-on-linker-gcd-function.exp

diff --git a/gdb/testsuite/gdb.base/break-on-linker-gcd-function.exp b/gdb/testsuite/gdb.base/break-on-linker-gcd-function.exp
index f430c51..18167b6 100644
--- a/gdb/testsuite/gdb.base/break-on-linker-gcd-function.exp
+++ b/gdb/testsuite/gdb.base/break-on-linker-gcd-function.exp
@@ -42,6 +42,13 @@
 
     set lineno [gdb_get_line_number "gdb break here"]
     gdb_test "set breakpoint pending on"
+
+    # PR testsuite/34534
+    set compiler [find_g++]
+    set res [catch {exec $compiler -Wl,--version} output]
+    if {[regexp "Solaris Link Editors" $output]} {
+	setup_xfail "*-*-solaris2*"
+    }
     gdb_test "b $lineno" \
 	[multi_line \
 	     "^No compiled code for line $lineno in the current file\\." \