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].

41 files changed, 155 insertions, 55 deletions

diff --git a/ld/ChangeLog b/ld/ChangeLog
index 4b4956e..a62a6c5 100644
--- a/ld/ChangeLog
+++ b/ld/ChangeLog
@@ -1,3 +1,50 @@
+2019-04-24  Sandra Loosemore  <sandra@codesourcery.com>
+
+	* 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].
+
 2019-04-23  Alan Modra  <amodra@gmail.com>
 
 	* Makefile.am (GENDEPDIR): New var, used..
diff --git a/ld/testsuite/config/default.exp b/ld/testsuite/config/default.exp
index 5acab06..ce52919 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] {
diff --git a/ld/testsuite/ld-auto-import/auto-import.exp b/ld/testsuite/ld-auto-import/auto-import.exp
index d9ac6cf..d5a0dcc 100644
--- a/ld/testsuite/ld-auto-import/auto-import.exp
+++ b/ld/testsuite/ld-auto-import/auto-import.exp
@@ -67,7 +67,7 @@ if [istarget *-pc-mingw*] {
 }
 
 # No compiler, no test.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested "Auto import test (compiler not found)"
     return
 }
diff --git a/ld/testsuite/ld-cygwin/exe-export.exp b/ld/testsuite/ld-cygwin/exe-export.exp
index 258949e..5436332 100644
--- a/ld/testsuite/ld-cygwin/exe-export.exp
+++ b/ld/testsuite/ld-cygwin/exe-export.exp
@@ -29,7 +29,7 @@ if {![istarget *-pc-cygwin]} {
 }

 

 # No compiler, no test.

-if { [which $CC] == 0 } {

+if { ![check_compiler_available] } {

     untested "Exe export test (no compiler available)"

     return

 }

diff --git a/ld/testsuite/ld-elf/audit.exp b/ld/testsuite/ld-elf/audit.exp
index 3514176..5cc044b 100644
--- a/ld/testsuite/ld-elf/audit.exp
+++ b/ld/testsuite/ld-elf/audit.exp
@@ -32,7 +32,7 @@ if ![check_shared_lib_support] {
 }
 
 # Check if compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/compress.exp b/ld/testsuite/ld-elf/compress.exp
index 6bdc921..90b6c6e 100644
--- a/ld/testsuite/ld-elf/compress.exp
+++ b/ld/testsuite/ld-elf/compress.exp
@@ -32,7 +32,7 @@ if ![check_shared_lib_support] {
 }
 
 # Check if compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/dwarf.exp b/ld/testsuite/ld-elf/dwarf.exp
index bc3cbb2..233a2a8 100644
--- a/ld/testsuite/ld-elf/dwarf.exp
+++ b/ld/testsuite/ld-elf/dwarf.exp
@@ -36,7 +36,7 @@ if ![check_shared_lib_support] {
 }
 
 # Check if compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/elf.exp b/ld/testsuite/ld-elf/elf.exp
index 4686870..9121936 100644
--- a/ld/testsuite/ld-elf/elf.exp
+++ b/ld/testsuite/ld-elf/elf.exp
@@ -182,7 +182,7 @@ set LDFLAGS $old_ldflags
 set ASFLAGS $old_asflags
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/indirect.exp b/ld/testsuite/ld-elf/indirect.exp
index b1a2c6c..1acb556 100644
--- a/ld/testsuite/ld-elf/indirect.exp
+++ b/ld/testsuite/ld-elf/indirect.exp
@@ -33,7 +33,7 @@ if ![check_shared_lib_support] {
 }
 
 # Check if compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/linux-x86.exp b/ld/testsuite/ld-elf/linux-x86.exp
index b1cad61..6b0f23f 100644
--- a/ld/testsuite/ld-elf/linux-x86.exp
+++ b/ld/testsuite/ld-elf/linux-x86.exp
@@ -20,7 +20,7 @@
 #
 
 # Test very simple native Linux/x86 programs with linux-x86.S.
-if { ![isnative] || [which $CC] == 0 \
+if { ![isnative] || ![check_compiler_available] \
      || (![istarget "i?86-*-linux*"] \
          && ![istarget "x86_64-*-linux*"] \
          && ![istarget "amd64-*-linux*"]) } {
diff --git a/ld/testsuite/ld-elf/shared.exp b/ld/testsuite/ld-elf/shared.exp
index b5a01c9..f27fa24 100644
--- a/ld/testsuite/ld-elf/shared.exp
+++ b/ld/testsuite/ld-elf/shared.exp
@@ -498,7 +498,7 @@ if { [istarget *-*-linux*]
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/tls.exp b/ld/testsuite/ld-elf/tls.exp
index 1b26f8b..4daddc7 100644
--- a/ld/testsuite/ld-elf/tls.exp
+++ b/ld/testsuite/ld-elf/tls.exp
@@ -29,7 +29,7 @@ if { ![istarget *-*-linux*]
 }
 
 # Check to see if the C compiler works.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elf/wrap.exp b/ld/testsuite/ld-elf/wrap.exp
index 3293231..1a9fa7c 100644
--- a/ld/testsuite/ld-elf/wrap.exp
+++ b/ld/testsuite/ld-elf/wrap.exp
@@ -32,7 +32,7 @@ if ![check_shared_lib_support] {
 }
 
 # Check if compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elfcomm/elfcomm.exp b/ld/testsuite/ld-elfcomm/elfcomm.exp
index 69eb0bc..6052e8f 100644
--- a/ld/testsuite/ld-elfcomm/elfcomm.exp
+++ b/ld/testsuite/ld-elfcomm/elfcomm.exp
@@ -107,7 +107,7 @@ set test1w2	"$test1 (warning 2)"
 set test1c1	"$test1 (change 1)"
 set test1c2	"$test1 (change 2)"
 
-if { ![is_remote host] && [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested $test1w1
     untested $test1w2
     untested $test1c1
diff --git a/ld/testsuite/ld-elfvers/vers.exp b/ld/testsuite/ld-elfvers/vers.exp
index 83b23a7..ebaaa78 100644
--- a/ld/testsuite/ld-elfvers/vers.exp
+++ b/ld/testsuite/ld-elfvers/vers.exp
@@ -23,7 +23,7 @@
 #
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elfvsb/elfvsb.exp b/ld/testsuite/ld-elfvsb/elfvsb.exp
index 0c1e962..bf0747a 100644
--- a/ld/testsuite/ld-elfvsb/elfvsb.exp
+++ b/ld/testsuite/ld-elfvsb/elfvsb.exp
@@ -25,7 +25,7 @@
 # Make sure that ld can generate ELF shared libraries with visibility.
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-elfweak/elfweak.exp b/ld/testsuite/ld-elfweak/elfweak.exp
index 4bc27ca..183f190 100644
--- a/ld/testsuite/ld-elfweak/elfweak.exp
+++ b/ld/testsuite/ld-elfweak/elfweak.exp
@@ -23,7 +23,7 @@
 #
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-gc/gc.exp b/ld/testsuite/ld-gc/gc.exp
index 422c3c3..fe50f31 100644
--- a/ld/testsuite/ld-gc/gc.exp
+++ b/ld/testsuite/ld-gc/gc.exp
@@ -39,7 +39,7 @@ if { [istarget m681*-*-*] || [istarget m68hc1*-*-*] } {
     set cflags "$cflags -fomit-frame-pointer -mshort"
 }
 
-if { [is_remote host] || [which $CC] != 0 } {
+if { [check_compiler_available] } {
     ld_compile "$CC -c $CFLAGS $cflags" $srcdir/$subdir/gc.c $objfile
 }
 
@@ -130,7 +130,7 @@ if { [is_elf_format] && [check_shared_lib_support] } then {
     set LDFLAGS $old_ldflags
 }
 
-if { [is_remote host] || [which $CC] != 0 } {
+if { [check_compiler_available] } {
     if { [istarget "*-*-linux*"]
 	 || [istarget "*-*-nacl*"]
 	 || [istarget "*-*-gnu*"] } {
@@ -141,24 +141,24 @@ if { [is_remote host] || [which $CC] != 0 } {
     }
 }
 
-if { [is_remote host] || [which $CC] != 0 } {
+if { [check_compiler_available] } {
 	ld_compile "$CC $CFLAGS $cflags" $srcdir/$subdir/pr13683.c tmpdir/pr13683.o
 	run_dump_test "pr13683"
 }
 
-if { [is_remote host] || [which $CC] != 0 } {
+if { [check_compiler_available] } {
     ld_compile "$CC $CFLAGS $cflags $NOPIE_CFLAGS" $srcdir/$subdir/pr14265.c tmpdir/pr14265.o
     run_dump_test "pr14265"
 }
 
-if { [is_remote host] || [which $CC] != 0 } {
+if { [check_compiler_available] } {
     ld_compile "$CC $CFLAGS $cflags -O0" $srcdir/$subdir/pr19161-1.c tmpdir/pr19161-1.o
     ld_compile "$CC $CFLAGS $cflags -O0" $srcdir/$subdir/pr19161-2.c tmpdir/pr19161-2.o
     run_dump_test "pr19161"
 }
 
 if { [is_elf_format] && [check_shared_lib_support] \
-     && ([is_remote host] || [which $CC] != 0) } {
+     && [check_compiler_available] } {
     run_cc_link_tests [list \
 	[list \
 	    "Build libpr20306.so" \
diff --git a/ld/testsuite/ld-i386/i386.exp b/ld/testsuite/ld-i386/i386.exp
index 9579df6..3a1fd8b 100644
--- a/ld/testsuite/ld-i386/i386.exp
+++ b/ld/testsuite/ld-i386/i386.exp
@@ -581,7 +581,7 @@ global PLT_CFLAGS
 # Must be Linux native with the C compiler
 if { [isnative]
      && [istarget "i?86-*-linux*"]
-     && [which $CC] != 0 } {
+     && [check_compiler_available] } {
     run_cc_link_tests [list \
 	[list \
 	    "Build plt-lib.so" \
@@ -1193,7 +1193,7 @@ global NOPIE_CFLAGS NOPIE_LDFLAGS
 if { [isnative]
      && [check_ifunc_available]
      && [istarget "i?86-*-*"]
-     && [which $CC] != 0 } {
+     && [check_compiler_available] } {
     run_cc_link_tests [list \
 	[list \
 	    "Build ifunc-1a.o ifunc-1b.o ifunc-1c.o ifunc-1d.o" \
@@ -1310,7 +1310,7 @@ if { [isnative]
 # Must be native with the C compiler.
 if { [isnative]
      && [istarget "i?86-*-*"]
-     && [which $CC] != 0 } {
+     && [check_compiler_available] } {
     run_cc_link_tests [list \
 	[list \
 	    "Build pr22001-1.so" \
diff --git a/ld/testsuite/ld-i386/no-plt.exp b/ld/testsuite/ld-i386/no-plt.exp
index 21040a1..6a75a04 100644
--- a/ld/testsuite/ld-i386/no-plt.exp
+++ b/ld/testsuite/ld-i386/no-plt.exp
@@ -35,7 +35,7 @@ if ![istarget "i?86-*-*"] {
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-i386/tls.exp b/ld/testsuite/ld-i386/tls.exp
index 79c6d9a..1587de6 100644
--- a/ld/testsuite/ld-i386/tls.exp
+++ b/ld/testsuite/ld-i386/tls.exp
@@ -32,7 +32,7 @@ if ![istarget "i?86-*-linux*"] {
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index e13b561..3fd616a 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -63,7 +63,7 @@ foreach t $test_list {
 
 # We need a working compiler.  (Strictly speaking this is
 # not true, we could use target specific assembler files).
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     verbose "IFUNC tests not run - no compiler available"
     return
 }
diff --git a/ld/testsuite/ld-mn10300/mn10300.exp b/ld/testsuite/ld-mn10300/mn10300.exp
index d7c6c45..b78ef55 100644
--- a/ld/testsuite/ld-mn10300/mn10300.exp
+++ b/ld/testsuite/ld-mn10300/mn10300.exp
@@ -134,7 +134,7 @@ proc i126256-test { } {
     set tmpdir tmpdir
     set testname "Seg fault whilst linking one shared library into another when relaxation is enabled."
 
-    if {![is_remote host] && [which $CC] == 0} then {
+    if { ![check_compiler_available] } then {
 	return
     }
 
diff --git a/ld/testsuite/ld-pe/pe-compile.exp b/ld/testsuite/ld-pe/pe-compile.exp
index e6154c5..84098f6 100644
--- a/ld/testsuite/ld-pe/pe-compile.exp
+++ b/ld/testsuite/ld-pe/pe-compile.exp
@@ -26,7 +26,7 @@ if {![is_pecoff_format]} {
 }
 
 # No compiler, no test.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested "PE version scripts"
     untested "aligned common tests"
     # Add more "untested" directives here when adding more tests below.
diff --git a/ld/testsuite/ld-pe/pe-run.exp b/ld/testsuite/ld-pe/pe-run.exp
index 1f06b7a..ae91b61 100644
--- a/ld/testsuite/ld-pe/pe-run.exp
+++ b/ld/testsuite/ld-pe/pe-run.exp
@@ -54,7 +54,7 @@ if {![is_pecoff_format]} {
 }
 
 # No compiler, no test.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested "Direct linking to dll test"
     return
 }
diff --git a/ld/testsuite/ld-pe/pe-run2.exp b/ld/testsuite/ld-pe/pe-run2.exp
index af45915..4ae239f 100644
--- a/ld/testsuite/ld-pe/pe-run2.exp
+++ b/ld/testsuite/ld-pe/pe-run2.exp
@@ -56,7 +56,7 @@ if {![is_pecoff_format]} {
 }
 
 # No compiler, no test.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested "Direct linking to dll fastcall/stdcall test"
     return
 }
diff --git a/ld/testsuite/ld-pie/pie.exp b/ld/testsuite/ld-pie/pie.exp
index 778a944..39c7205 100644
--- a/ld/testsuite/ld-pie/pie.exp
+++ b/ld/testsuite/ld-pie/pie.exp
@@ -26,7 +26,7 @@ if { ![istarget *-*-linux*]
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-plugin/lto.exp b/ld/testsuite/ld-plugin/lto.exp
index d097f06..3449a07 100644
--- a/ld/testsuite/ld-plugin/lto.exp
+++ b/ld/testsuite/ld-plugin/lto.exp
@@ -19,7 +19,7 @@
 # MA 02110-1301, USA.
 
 # Check to see if the C and C++ compilers work
-if { [which $CC] == 0 || [which $CXX] == 0 } {
+if { ![check_compiler_available] || [which $CXX] == 0 } {
     return
 }
 
diff --git a/ld/testsuite/ld-plugin/plugin.exp b/ld/testsuite/ld-plugin/plugin.exp
index 8b0ea9c..ee193e9 100644
--- a/ld/testsuite/ld-plugin/plugin.exp
+++ b/ld/testsuite/ld-plugin/plugin.exp
@@ -26,7 +26,7 @@ if ![check_plugin_api_available] {
 # And a compiler to be available.
 set can_compile 1
 set failure_kind "unresolved"
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
   # Don't fail immediately, 
   set can_compile 0
   set failure_kind "unsupported"
diff --git a/ld/testsuite/ld-scripts/crossref.exp b/ld/testsuite/ld-scripts/crossref.exp
index 9aa216e..35573cd 100644
--- a/ld/testsuite/ld-scripts/crossref.exp
+++ b/ld/testsuite/ld-scripts/crossref.exp
@@ -27,7 +27,7 @@ set test5 "NOCROSSREFS_TO 2"
 set test6 "NOCROSSREFS_TO 3"
 set test7 "NOCROSSREFS_TO 4"
 
-if { ![is_remote host] && [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested $test1
     untested $test2
     untested $test3
diff --git a/ld/testsuite/ld-sh/sh.exp b/ld/testsuite/ld-sh/sh.exp
index 09263bb..1fca64d 100644
--- a/ld/testsuite/ld-sh/sh.exp
+++ b/ld/testsuite/ld-sh/sh.exp
@@ -129,7 +129,7 @@ set testlink "SH relaxing"
 set testjsr "SH confirm relaxing"
 set testrun "SH relaxing execution"
 
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested $testlink
     untested $testjsr
     untested $testrun
diff --git a/ld/testsuite/ld-shared/shared.exp b/ld/testsuite/ld-shared/shared.exp
index 0e3d75e..ed17b93 100644
--- a/ld/testsuite/ld-shared/shared.exp
+++ b/ld/testsuite/ld-shared/shared.exp
@@ -26,7 +26,7 @@
 # bootstrap test.
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-size/size.exp b/ld/testsuite/ld-size/size.exp
index 804ae11..c3493d2 100644
--- a/ld/testsuite/ld-size/size.exp
+++ b/ld/testsuite/ld-size/size.exp
@@ -48,7 +48,7 @@ foreach t $test_list {
 }
 
 # We need a working compiler.
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     verbose "Native size relocation tests not run - no compiler available"
     return
 }
diff --git a/ld/testsuite/ld-srec/srec.exp b/ld/testsuite/ld-srec/srec.exp
index afb1729..944e0a7 100644
--- a/ld/testsuite/ld-srec/srec.exp
+++ b/ld/testsuite/ld-srec/srec.exp
@@ -342,7 +342,7 @@ set sizeof_headers [string match "*SIZEOF_HEADERS*" $exec_output]
 # directly to the S-record format, and require that the two files
 # contain the same data.
 
-if { ![is_remote host] && [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     untested $test1
     untested $test2
     return
diff --git a/ld/testsuite/ld-undefined/undefined.exp b/ld/testsuite/ld-undefined/undefined.exp
index 83433f3..8a8e865 100644
--- a/ld/testsuite/ld-undefined/undefined.exp
+++ b/ld/testsuite/ld-undefined/undefined.exp
@@ -24,7 +24,7 @@ set testund "undefined"
 set testfn "undefined function"
 set testline "undefined line"
 
-if { ![is_remote host] && [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     verbose "Could not find C compiler!" 1
     untested $testund
     untested $testfn
diff --git a/ld/testsuite/ld-unique/unique.exp b/ld/testsuite/ld-unique/unique.exp
index 2cda133..eb21108 100644
--- a/ld/testsuite/ld-unique/unique.exp
+++ b/ld/testsuite/ld-unique/unique.exp
@@ -44,7 +44,7 @@ foreach t $test_list {
 
 # We need a working compiler.  (Strictly speaking this is
 # not true, we could use target specific assembler files).
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     verbose "UNIQUE compiled tests not run - no compiler available"
     return
 }
diff --git a/ld/testsuite/ld-x86-64/mpx.exp b/ld/testsuite/ld-x86-64/mpx.exp
index 6474084..4e63039 100644
--- a/ld/testsuite/ld-x86-64/mpx.exp
+++ b/ld/testsuite/ld-x86-64/mpx.exp
@@ -32,7 +32,7 @@ if ![istarget "x86_64-*-linux*"] {
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-x86-64/no-plt.exp b/ld/testsuite/ld-x86-64/no-plt.exp
index 77c90b1..7409345 100644
--- a/ld/testsuite/ld-x86-64/no-plt.exp
+++ b/ld/testsuite/ld-x86-64/no-plt.exp
@@ -35,7 +35,7 @@ if ![istarget "x86_64-*-*"] {
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-x86-64/tls.exp b/ld/testsuite/ld-x86-64/tls.exp
index b3b8a83..0b9f5c5 100644
--- a/ld/testsuite/ld-x86-64/tls.exp
+++ b/ld/testsuite/ld-x86-64/tls.exp
@@ -32,7 +32,7 @@ if ![istarget "x86_64-*-linux*"] {
 }
 
 # Check to see if the C compiler works
-if { [which $CC] == 0 } {
+if { ![check_compiler_available] } {
     return
 }
 
diff --git a/ld/testsuite/ld-x86-64/x86-64.exp b/ld/testsuite/ld-x86-64/x86-64.exp
index 98aa4b0..23f2020 100644
--- a/ld/testsuite/ld-x86-64/x86-64.exp
+++ b/ld/testsuite/ld-x86-64/x86-64.exp
@@ -731,7 +731,7 @@ global PLT_CFLAGS
 global NOPIE_CFLAGS NOPIE_LDFLAGS
 
 # Must be native with the C compiler
-if { [isnative] && [which $CC] != 0 } {
+if { [isnative] && [check_compiler_available] } {
     run_cc_link_tests {
 	{"Helper X32 DSO from x86-64 object" "" "-m64 -fPIC -g"
 	 {simple.c} {} "libsimple.a"}
diff --git a/ld/testsuite/lib/ld-lib.exp b/ld/testsuite/lib/ld-lib.exp
index dc55dc8..0ff51c9 100644
--- a/ld/testsuite/lib/ld-lib.exp
+++ b/ld/testsuite/lib/ld-lib.exp
@@ -688,6 +688,11 @@ proc run_ld_link_exec_tests { ldtests args } {
 	set objfiles {}
 	set failed 0
 
+	if { ![check_compiler_available] } {
+	    unsupported $testname
+	    continue
+	}
+
 #	verbose -log "Testname is $testname"
 #	verbose -log "ld_options is $ld_options"
 #	verbose -log "as_options is $as_options"
@@ -840,6 +845,11 @@ proc run_cc_link_tests { ldtests } {
 	set check_ld(terminal) 0
 	set check_ld(source) ""
 
+	if { ![check_compiler_available] } {
+	    unsupported $testname
+	    continue
+	}
+
 	#verbose -log "testname  is $testname"
 	#verbose -log "ldflags   is $ldflags"
 	#verbose -log "cflags    is $cflags"
@@ -1140,6 +1150,49 @@ proc check_sysroot_available { } {
     return $ld_sysroot_available_saved
 }
 
+# Return true if we can build a program with the compiler.
+# On some targets, CC might be defined, but libraries and startup
+# code might be missing or require special options that the ld test
+# harness doesn't know about.
+
+proc check_compiler_available { } {
+    global compiler_available_saved
+    global CC
+
+    if {![info exists compiler_available_saved]} {
+        if { [which $CC] == 0 } {
+	    set compiler_available_saved 0
+	    return 0
+	}
+
+	set flags ""
+	if [board_info [target_info name] exists cflags] {
+	    append flags " [board_info [target_info name] cflags]"
+	}
+	if [board_info [target_info name] exists ldflags] {
+	    append flags " [board_info [target_info name] ldflags]"
+	}
+
+	set basename "tmpdir/compiler[pid]"
+	set src ${basename}.c
+	set output ${basename}.out
+	set f [open $src "w"]
+	puts $f "int main (void)"
+	puts $f "{"
+	puts $f "  return 0; "
+	puts $f "}"
+	close $f
+	if [is_remote host] {
+	    set src [remote_download host $src]
+	}
+	set compiler_available_saved [run_host_cmd_yesno "$CC" "$flags $src -o $output"]
+	remote_file host delete $src
+	remote_file host delete $output
+	file delete $src
+    }
+    return $compiler_available_saved
+}
+
 # Returns 1 if plugin is enabled in gcc.  Returns 0 otherwise.
 proc check_gcc_plugin_enabled { } {
     global CC
@@ -1327,7 +1380,7 @@ proc check_ifunc_available { } {
     global CC
 
     if {![info exists ifunc_available_saved]} {
-        if { [which $CC] == 0 } {
+        if { ![check_compiler_available] } {
 	    set ifunc_available_saved 0
 	    return 0
 	}
@@ -1376,7 +1429,7 @@ proc check_ifunc_attribute_available { } {
     global CC
 
     if {![info exists ifunc_attribute_available_saved]} {
-        if { [which $CC] == 0 } {
+        if { ![check_compiler_available] } {
 	    set ifunc_attribute_available_saved 0
 	    return 0
 	}
@@ -1423,7 +1476,7 @@ proc check_libdl_available { } {
     global CC
 
     if {![info exists libdl_available_saved]} {
-        if { [which $CC] == 0 } {
+        if { ![check_compiler_available] } {
 	    set libdl_available_saved 0
 	    return 0
 	}
@@ -1459,7 +1512,7 @@ proc check_gnu2_tls_available { } {
     global GNU2_CFLAGS
 
     if {![info exists gnu2_tls_available_saved]} {
-        if { [which $CC] == 0 || "$GNU2_CFLAGS" == "" } {
+        if { ![check_compiler_available] || "$GNU2_CFLAGS" == "" } {
 	    set gnu2_tls_available_saved 0
 	    return 0
 	}