testsuite, ubsan: Add libstdc++ deps where required.

We use the ubsan tests from both C, C++, D and Fortran.
thee sanitizer libraries link to libstdc++.

When we are using the C/gdc/gfortran driver, and the target might
require a path to the libstdc++ (e.g. for handing -static-xxxx or
for embedded runpaths), we need to add a suitable option (or we get
fails at execution time because of the missing paths).

Conversely, we do not want to add multiple instances of these
paths (since that leads to failures on tools that report warnings
for duplicate runpaths).

This patch modifies the _init function to allow a sigle parameter
that determines whether the *asan_init should add a path for
libstdc++ (yes for C driver, no for C++ driver).
gcc/testsuite/ChangeLog:

	* g++.dg/ubsan/ubsan.exp:Add a parameter to init to say that
	we expect the C++ driver to provide paths for libstdc++.
	* gcc.dg/ubsan/ubsan.exp: Add a parameter to init to say that
	we need a path added for libstdc++.
	* gdc.dg/ubsan/ubsan.exp: Likewise.
	* gfortran.dg/ubsan/ubsan.exp: Likewise.
	* lib/ubsan-dg.exp: Handle a single parameter to init that
	requests addition of a path to libstdc++ to link flags.

5 files changed, 23 insertions, 10 deletions

diff --git a/gcc/testsuite/g++.dg/ubsan/ubsan.exp b/gcc/testsuite/g++.dg/ubsan/ubsan.exp
index d719707..4bab1b8 100644
--- a/gcc/testsuite/g++.dg/ubsan/ubsan.exp
+++ b/gcc/testsuite/g++.dg/ubsan/ubsan.exp
@@ -22,7 +22,8 @@ load_lib ubsan-dg.exp
 
 # Initialize `dg'.
 dg-init
-ubsan_init
+# libubsan uses libstdc++ but we assume that's added by the g++ impl.
+ubsan_init 0
 
 # Main loop.
 if [check_effective_target_fsanitize_undefined] {
diff --git a/gcc/testsuite/gcc.dg/ubsan/ubsan.exp b/gcc/testsuite/gcc.dg/ubsan/ubsan.exp
index 8417049..560e584 100644
--- a/gcc/testsuite/gcc.dg/ubsan/ubsan.exp
+++ b/gcc/testsuite/gcc.dg/ubsan/ubsan.exp
@@ -24,7 +24,8 @@ load_lib ubsan-dg.exp
 
 # Initialize `dg'.
 dg-init
-ubsan_init
+# libubsan uses libstdc++ so make sure we provide paths for it.
+ubsan_init 1
 
 # Main loop.
 if [check_effective_target_fsanitize_undefined] {
diff --git a/gcc/testsuite/gdc.dg/ubsan/ubsan.exp b/gcc/testsuite/gdc.dg/ubsan/ubsan.exp
index 6ad665a..7613a3b 100644
--- a/gcc/testsuite/gdc.dg/ubsan/ubsan.exp
+++ b/gcc/testsuite/gdc.dg/ubsan/ubsan.exp
@@ -20,7 +20,8 @@ load_lib ubsan-dg.exp
 
 # Initialize `dg'.
 dg-init
-ubsan_init
+# libubsan uses libstdc++ so make sure we provide paths for it.
+ubsan_init 1
 
 # Main loop.
 if [check_effective_target_fsanitize_undefined] {
diff --git a/gcc/testsuite/gfortran.dg/ubsan/ubsan.exp b/gcc/testsuite/gfortran.dg/ubsan/ubsan.exp
index 0c61153..b236078 100644
--- a/gcc/testsuite/gfortran.dg/ubsan/ubsan.exp
+++ b/gcc/testsuite/gfortran.dg/ubsan/ubsan.exp
@@ -22,10 +22,10 @@
 load_lib gfortran-dg.exp
 load_lib ubsan-dg.exp
 
-
 # Initialize `dg'.
 dg-init
-ubsan_init
+# libubsan uses libstdc++ so make sure we provide paths for it.
+ubsan_init 1
 
 # Main loop.
 if [check_effective_target_fsanitize_undefined] {
diff --git a/gcc/testsuite/lib/ubsan-dg.exp b/gcc/testsuite/lib/ubsan-dg.exp
index 108b998..860e78f 100644
--- a/gcc/testsuite/lib/ubsan-dg.exp
+++ b/gcc/testsuite/lib/ubsan-dg.exp
@@ -31,7 +31,7 @@ proc check_effective_target_fsanitize_undefined {} {
 # (originally from g++.exp)
 #
 
-proc ubsan_link_flags { paths } {
+proc ubsan_link_flags { paths needs_cxx } {
     global srcdir
     global ld_library_path
     global shlib_ext
@@ -43,15 +43,24 @@ proc ubsan_link_flags { paths } {
     set shlib_ext [get_shlib_extension]
     set ubsan_saved_library_path $ld_library_path
 
+    # Providing -B instead of -L means that it works for targets that use
+    # spec substitution for handling -static-xxxxx, it also works for targets
+    # the use the startfile paths to provide a runpath for uninstalled test.
+    # Each -B option will produce a -L on the link line (for paths that exist).
     if { $gccpath != "" } {
       if { [file exists "${gccpath}/libsanitizer/ubsan/.libs/libubsan.a"]
 	   || [file exists "${gccpath}/libsanitizer/ubsan/.libs/libubsan.${shlib_ext}"] } {
 	  append flags " -B${gccpath}/libsanitizer/ "
 	  append flags " -B${gccpath}/libsanitizer/ubsan/ "
-	  append flags " -L${gccpath}/libsanitizer/ubsan/.libs"
+	  append flags " -B${gccpath}/libsanitizer/ubsan/.libs"
 	  append ld_library_path ":${gccpath}/libsanitizer/ubsan/.libs"
-	  append ld_library_path ":${gccpath}/libstdc++-v3/src/.libs"
       }
+      # libasan links to libstdc++, so we must include it for C testcases.
+      if { $needs_cxx && ( [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.a"]
+	   || [file exists "${gccpath}/libstdc++-v3/src/.libs/libstdc++.${shlib_ext}"] ) } {
+	append flags " -B${gccpath}/libstdc++-v3/src/.libs "
+	append ld_library_path ":${gccpath}/libstdc++-v3/src/.libs"
+      }      
     } else {
       global tool_root_dir
 
@@ -79,6 +88,7 @@ proc ubsan_init { args } {
     global ubsan_saved_ALWAYS_CXXFLAGS
     global orig_ubsan_options_saved
     global orig_ubsan_options
+    set needs_cxx [lindex $args 0]
 
     if { $orig_ubsan_options_saved == 0 } {
 	# Save the original environment.
@@ -92,9 +102,9 @@ proc ubsan_init { args } {
     set link_flags ""
     if ![is_remote host] {
 	if [info exists TOOL_OPTIONS] {
-	    set link_flags "[ubsan_link_flags [get_multilibs ${TOOL_OPTIONS}]]"
+	    set link_flags "[ubsan_link_flags [get_multilibs ${TOOL_OPTIONS}] $needs_cxx]"
 	} else {
-	    set link_flags "[ubsan_link_flags [get_multilibs]]"
+	    set link_flags "[ubsan_link_flags [get_multilibs] $needs_cxx]"
 	}
     }