libgo: fix DejaGNU testsuite compiler when using build sysroot

Patch from Thomas Schwinge.

PR testsuite/109951
* configure.ac: 'AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)'.
* Makefile.in: Regenerate.
* configure: Likewise.
* testsuite/Makefile.in: Likewise.
* testsuite/lib/libgo.exp (libgo_init): If
'--with-build-sysroot=[...]' was specified, use it for build-tree
testing.
* testsuite/libgo-test-support.exp.in (GOC_UNDER_TEST): Don't set.
(SYSROOT_CFLAGS_FOR_TARGET): Set.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/527755

6 files changed, 18 insertions, 3 deletions

diff --git a/libgo/Makefile.in b/libgo/Makefile.in
index 40340bf..8dcb6d6 100644
--- a/libgo/Makefile.in
+++ b/libgo/Makefile.in
@@ -474,6 +474,7 @@ SPLIT_STACK = @SPLIT_STACK@
 STRINGOPS_FLAG = @STRINGOPS_FLAG@
 STRIP = @STRIP@
 STRUCT_EPOLL_EVENT_FD_OFFSET = @STRUCT_EPOLL_EVENT_FD_OFFSET@
+SYSROOT_CFLAGS_FOR_TARGET = @SYSROOT_CFLAGS_FOR_TARGET@
 USE_DEJAGNU = @USE_DEJAGNU@
 VERSION = @VERSION@
 WARN_FLAGS = @WARN_FLAGS@
diff --git a/libgo/configure b/libgo/configure
index a607dbf..2f1609b 100755
--- a/libgo/configure
+++ b/libgo/configure
@@ -633,6 +633,7 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+SYSROOT_CFLAGS_FOR_TARGET
 HAVE_STATIC_LINK_FALSE
 HAVE_STATIC_LINK_TRUE
 HAVE_STAT_TIMESPEC_FALSE
@@ -11544,7 +11545,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11547 "configure"
+#line 11548 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11650,7 +11651,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11653 "configure"
+#line 11654 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16147,6 +16148,8 @@ else
 fi
 
 
+
+
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure
diff --git a/libgo/configure.ac b/libgo/configure.ac
index a59aa09..54c35c0 100644
--- a/libgo/configure.ac
+++ b/libgo/configure.ac
@@ -913,6 +913,8 @@ AC_LINK_IFELSE([AC_LANG_PROGRAM(,)],
 LDFLAGS=$LDFLAGS_hold])
 AM_CONDITIONAL(HAVE_STATIC_LINK, test "$libgo_cv_ld_static" = yes)
 
+AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)
+
 AC_CACHE_SAVE
 
 if test ${multilib} = yes; then
diff --git a/libgo/testsuite/Makefile.in b/libgo/testsuite/Makefile.in
index 7869265..7c2e2e6 100644
--- a/libgo/testsuite/Makefile.in
+++ b/libgo/testsuite/Makefile.in
@@ -223,6 +223,7 @@ SPLIT_STACK = @SPLIT_STACK@
 STRINGOPS_FLAG = @STRINGOPS_FLAG@
 STRIP = @STRIP@
 STRUCT_EPOLL_EVENT_FD_OFFSET = @STRUCT_EPOLL_EVENT_FD_OFFSET@
+SYSROOT_CFLAGS_FOR_TARGET = @SYSROOT_CFLAGS_FOR_TARGET@
 USE_DEJAGNU = @USE_DEJAGNU@
 VERSION = @VERSION@
 WARN_FLAGS = @WARN_FLAGS@
diff --git a/libgo/testsuite/lib/libgo.exp b/libgo/testsuite/lib/libgo.exp
index b5833bb..638bf86 100644
--- a/libgo/testsuite/lib/libgo.exp
+++ b/libgo/testsuite/lib/libgo.exp
@@ -53,5 +53,13 @@ load_gcc_lib timeout.exp
 load_gcc_lib go.exp
 
 proc libgo_init { args } {
+    global TESTING_IN_BUILD_TREE
+    if { [info exists TESTING_IN_BUILD_TREE] } {
+	# If '--with-build-sysroot=[...]' was specified, use it for build-tree
+	# testing.
+	global TEST_ALWAYS_FLAGS SYSROOT_CFLAGS_FOR_TARGET
+	set TEST_ALWAYS_FLAGS $SYSROOT_CFLAGS_FOR_TARGET
+    }
+
     go_init $args
 }
diff --git a/libgo/testsuite/libgo-test-support.exp.in b/libgo/testsuite/libgo-test-support.exp.in
index aaa6c5e..effd6f1 100644
--- a/libgo/testsuite/libgo-test-support.exp.in
+++ b/libgo/testsuite/libgo-test-support.exp.in
@@ -14,4 +14,4 @@
 # along with GCC; see the file COPYING3.  If not see
 # <http://www.gnu.org/licenses/>.
 
-set GOC_UNDER_TEST {@GOC@}
+set SYSROOT_CFLAGS_FOR_TARGET {@SYSROOT_CFLAGS_FOR_TARGET@}