Use better test for usable compiler in ld testsuite.

The ld testsuite includes numerous tests that depend on being able to
compile and link programs with the C compiler.  Some of these tests
use [which $CC] to check for the presence of the compiler before
proceeding with the test, but run_ld_link_exec_tests and run_cc_link_tests
give ERRORs if compilation fails.  Also, even if $CC is defined and present,
it may not be usable due to missing libraries, etc.

This patch adds a new procedure check_compiler_available that attempts
to build an empty program and caches the result.  Uses of [which $CC]
are replaced with calls to this procedure, and run_ld_link_exec_tests
and run_cc_link_tests now also guard attempts to use $CC.

2019-04-24  Sandra Loosemore  <sandra@codesourcery.com>

	ld/
	* testsuite/config/default.exp: Use [check_compiler_available]
	instead of [which $CC].
	* testsuite/ld-auto-import/auto-import.exp: Likewise.
	* testsuite/ld-cygwin/exe-export.exp: Likewise.
	* testsuite/ld-elf/audit.exp: Likewise.
	* testsuite/ld-elf/compress.exp: Likewise.
	* testsuite/ld-elf/dwarf.exp: Likewise.
	* testsuite/ld-elf/elf.exp: Likewise.
	* testsuite/ld-elf/indirect.exp: Likewise.
	* testsuite/ld-elf/linux-x86.exp: Likewise.
	* testsuite/ld-elf/shared.exp: Likewise.
	* testsuite/ld-elf/tls.exp: Likewise.
	* testsuite/ld-elf/wrap.exp: Likewise.
	* testsuite/ld-elfcomm/elfcomm.exp: Likewise.
	* testsuite/ld-elfvers/vers.exp: Likewise.
	* testsuite/ld-elfvsb/elfvsb.exp: Likewise.
	* testsuite/ld-elfweak/elfweak.exp: Likewise.
	* testsuite/ld-gc/gc.exp: Likewise.
	* testsuite/ld-i386/i386.exp: Likewise.
	* testsuite/ld-i386/no-plt.exp: Likewise.
	* testsuite/ld-i386/tls.exp: Likewise.
	* testsuite/ld-ifunc/ifunc.exp: Likewise.
	* testsuite/ld-mn10300/mn10300.exp: Likewise.
	* testsuite/ld-pe/pe-compile.exp: Likewise.
	* testsuite/ld-pe/pe-run.exp: Likewise.
	* testsuite/ld-pe/pe-run2.exp: Likewise.
	* testsuite/ld-pie/pie.exp: Likewise.
	* testsuite/ld-plugin/lto.exp: Likewise.
	* testsuite/ld-plugin/plugin.exp: Likewise.
	* testsuite/ld-scripts/crossref.exp: Likewise.
	* testsuite/ld-sh/sh.exp: Likewise.
	* testsuite/ld-shared/shared.exp: Likewise.
	* testsuite/ld-size/size.exp: Likewise.
	* testsuite/ld-srec/srec.exp: Likewise.
	* testsuite/ld-undefined/undefined.exp: Likewise.
	* testsuite/ld-unique/unique.exp: Likewise.
	* testsuite/ld-x86-64/mpx.exp: Likewise.
	* testsuite/ld-x86-64/no-plt.exp: Likewise.
	* testsuite/ld-x86-64/tls.exp: Likewise.
	* testsuite/ld-x86-64/x86-64.exp: Likewise.
	* testsuite/lib/ld-lib.exp (run_ld_link_exec_tests): Call
	check_compiler_available before trying to use the compiler.
	(run_cc_link_tests): Likewise.
	(check_compiler_available): New.  Use it instead of [which $CC].

1 files changed, 6 insertions, 6 deletions

diff --git a/ld/testsuite/config/default.exp b/ld/testsuite/config/default.exp
index 5acab063291..ce52919e796 100644
--- a/ld/testsuite/config/default.exp
+++ b/ld/testsuite/config/default.exp
@@ -269,7 +269,7 @@ if { ![info exists LD_CLASS] } then {
 # Set PLT_CFLAGS to "-fplt" if target compiler supports it.
 
 if { ![info exists PLT_CFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports -fplt
 	set flags ""
 	if [board_info [target_info name] exists cflags] {
@@ -307,7 +307,7 @@ if { ![info exists PLT_CFLAGS] } then {
 # target compiler supports them.
 
 if { ![info exists NOPIE_CFLAGS] || ![info exists NOPIE_LDFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports -fno-PIE -no-pie.
 	set flags ""
 	if [board_info [target_info name] exists cflags] {
@@ -347,7 +347,7 @@ if { ![info exists NOPIE_CFLAGS] || ![info exists NOPIE_LDFLAGS] } then {
 # Set GNU2_CFLAGS to "-mtls-dialect=gnu2" if target compiler supports it.
 
 if { ![info exists GNU2_CFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports -mtls-dialect=gnu2
 	set flags ""
 	if [board_info [target_info name] exists cflags] {
@@ -384,7 +384,7 @@ if { ![info exists GNU2_CFLAGS] } then {
 # Set INT128_CFLAGS to "-DHAS_INT128" if target compiler supports __int128.
 
 if { ![info exists INT128_CFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports __int128.
 	set flags ""
 	if [board_info [target_info name] exists cflags] {
@@ -421,7 +421,7 @@ if { ![info exists INT128_CFLAGS] } then {
 # Set STATIC_LDFLAGS to "-static" if target compiler supports it.
 
 if { ![info exists STATIC_LDFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports -static.
 	set flags ""
 	if [board_info [target_info name] exists cflags] {
@@ -458,7 +458,7 @@ if { ![info exists STATIC_LDFLAGS] } then {
 # Set STATIC_PIE_LDFLAGS to "-static-pie" if target compiler supports it.
 
 if { ![info exists STATIC_PIE_LDFLAGS] } then {
-    if { [which $CC] != 0 } {
+    if { [check_compiler_available] } {
 	# Check if gcc supports -static-pie.
 	set flags ""
 	if [board_info [target_info name] exists cflags] {