testsuite: Fix mistransformed gcov

In commit r13-2619-g34b9a03353d3fd, [transform] was applied to all
invocations of gcov, for both out-of-tree and in-tree testing.
For in-tree cross builds, this means gcov was called as
"/path/to/gccobj/gcc/target-tuple-gcov" gcov-pr94029.c which is
incorrect, as it's there "/path/to/gccobj/gcc/gcov" until it's
installed.  This caused a testsuite failure, like:

Running /x/gcc/gcc/testsuite/gcc.misc-tests/gcov.exp ...
FAIL: gcc.misc-tests/gcov-pr94029.c gcov failed: spawn failed

To avoid cumbersome conditionals, use a dedicated new helper function.

gcc/testsuite:
	* lib/gcc-dg.exp (gcc-transform-out-of-tree): New proc.
	* g++.dg/gcov/gcov.exp, gcc.misc-tests/gcov.exp: Call
	gcc-transform-out-of-tree instead of transform.

3 files changed, 17 insertions, 4 deletions

diff --git a/gcc/testsuite/g++.dg/gcov/gcov.exp b/gcc/testsuite/g++.dg/gcov/gcov.exp
index 04e7a01..def827d 100644
--- a/gcc/testsuite/g++.dg/gcov/gcov.exp
+++ b/gcc/testsuite/g++.dg/gcov/gcov.exp
@@ -24,9 +24,9 @@ global GXX_UNDER_TEST
 
 # Find gcov in the same directory as $GXX_UNDER_TEST.
 if { ![is_remote host] && [string match "*/*" [lindex $GXX_UNDER_TEST 0]] } {
-    set GCOV [file dirname [lindex $GXX_UNDER_TEST 0]]/[transform gcov]
+    set GCOV [file dirname [lindex $GXX_UNDER_TEST 0]]/[gcc-transform-out-of-tree gcov]
 } else {
-    set GCOV [transform gcov]
+    set GCOV [gcc-transform-out-of-tree gcov]
 }
 
 # Initialize harness.
diff --git a/gcc/testsuite/gcc.misc-tests/gcov.exp b/gcc/testsuite/gcc.misc-tests/gcov.exp
index b8e9661..bc8e2c9 100644
--- a/gcc/testsuite/gcc.misc-tests/gcov.exp
+++ b/gcc/testsuite/gcc.misc-tests/gcov.exp
@@ -24,9 +24,9 @@ global GCC_UNDER_TEST
 
 # For now find gcov in the same directory as $GCC_UNDER_TEST.
 if { ![is_remote host] && [string match "*/*" [lindex $GCC_UNDER_TEST 0]] } {
-    set GCOV [file dirname [lindex $GCC_UNDER_TEST 0]]/[transform gcov]
+    set GCOV [file dirname [lindex $GCC_UNDER_TEST 0]]/[gcc-transform-out-of-tree gcov]
 } else {
-    set GCOV [transform gcov]
+    set GCOV [gcc-transform-out-of-tree gcov]
 }
 
 # Initialize harness.
diff --git a/gcc/testsuite/lib/gcc-dg.exp b/gcc/testsuite/lib/gcc-dg.exp
index 23ec038..0129b11 100644
--- a/gcc/testsuite/lib/gcc-dg.exp
+++ b/gcc/testsuite/lib/gcc-dg.exp
@@ -1429,5 +1429,18 @@ proc scan-symbol-not { args } {
     }
 }
 
+# Transform a tool-name to its canonical-target-name by "transform"
+# (which may return the original name for native targets) but only if
+# testing out-of-tree.  When in-tree, the tool is expected to be found
+# by its original name, typically with some build-directory prefix
+# prepended by the caller.
+proc gcc-transform-out-of-tree { args } {
+    global TESTING_IN_BUILD_TREE
+    if { [info exists TESTING_IN_BUILD_TREE] } {
+	return $args;
+    }
+    return [transform $args]
+}
+
 set additional_prunes ""
 set dg_runtest_extra_prunes ""