[PATCH] [PR gdb/23095] Fixed test case to compile & run on FreeBSD

[Rajendra SY <rajendra.sy@gmail.com>]

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Problems:
1. linking -dl lib on FreeBSD platform
2. backtrace from ld-elf shows r_debug_state() instead of _dl_debug_state()

Cause:
1. There is no dl library on FreeBSD platform test has to ignore linking "-ldl"
2. The stop due to a shared library event shows backtrace frame #0
function as r_debug_state()

Test passed:
PASS: gdb.base/break-probes.exp: set stop-on-solib-events 1

gdb/ChangeLog:
2018-04-20  Rajendra SY  <rajendra.sy@gmail.com>

        PR gdb/23095
        * gdb/testsuite/gdb.base/break-probes.exp:

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diff --git a/gdb/testsuite/gdb.base/break-probes.exp b/gdb/testsuite/gdb.base/break-probes.exp
index 22aa66171c..7dbc78e94b 100644
--- a/gdb/testsuite/gdb.base/break-probes.exp
+++ b/gdb/testsuite/gdb.base/break-probes.exp
@@ -23,7 +23,11 @@ set libname $testfile-solib
 set srcfile_lib $srcdir/$subdir/$libname.c
 set binfile_lib [standard_output_file $libname.so]
 
-set normal_bp "_dl_debug_state"
+if { [istarget "*bsd*"] } {
+  set normal_bp "r_debug_state"
+} else {
+  set normal_bp "_dl_debug_state"
+}
 set probes_bp "dl_main"
 
 if { [gdb_compile_shlib $srcfile_lib $binfile_lib \
@@ -32,8 +36,13 @@ if { [gdb_compile_shlib $srcfile_lib $binfile_lib \
     return -1
 }
 
+set lib_dl "-ldl"
+if { [istarget "*bsd*"] } {
+  set lib_dl ""
+}
+
 if { [prepare_for_testing "failed to prepare" $testfile $srcfile \
-	  [list additional_flags=-DSHLIB_NAME=\"$binfile_lib\" libs=-ldl]] } {
+	  [list additional_flags=-DSHLIB_NAME=\"$binfile_lib\" libs=${lib_dl}]] } {
     return -1
 }