[PATCH] testsuite: fix out-of-tree make check with broken shell echo

make check copies testsuite/ to objtree and runs runtest there with
srcdir pointing at the source testsuite.

If /bin/sh echo does not support -ne, testing.sh builds the echo-ne
helper. This used ../scripts/echo.c, which exists for in-tree manual
tests but not in the copied out-of-tree testsuite, causing:

  cc1: fatal error: ../scripts/echo.c: No such file or directory

Use srcdir to find scripts/echo.c when available, and pass HOSTCC from
make check for building the host-side helper. Keep gcc as the fallback
for manual tests.

Signed-off-by: Karl Mehltretter <[email protected]>
---
 Makefile.custom      | 2 +-
 testsuite/testing.sh | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Makefile.custom b/Makefile.custom
index 6f679c4e1..12dfa1561 100644
--- a/Makefile.custom
+++ b/Makefile.custom
@@ -71,7 +71,7 @@ endif
 check test: busybox busybox.links
 	$(UNIT_CMD)
 	test -d $(objtree)/testsuite || cp -pPR $(srctree)/testsuite $(objtree)
-	bindir=$(objtree) srcdir=$(srctree)/testsuite \
+	bindir=$(objtree) srcdir=$(srctree)/testsuite HOSTCC="$(HOSTCC)" \
 	$(SHELL) -c "cd $(objtree)/testsuite && $(srctree)/testsuite/runtest $(if $(KBUILD_VERBOSE:0=),-v)"
 
 .PHONY: release
diff --git a/testsuite/testing.sh b/testsuite/testing.sh
index 95bb46dda..83d18017b 100644
--- a/testsuite/testing.sh
+++ b/testsuite/testing.sh
@@ -44,7 +44,11 @@ test x"$ECHO" != x"" || {
 		# Compile and use a replacement 'echo' which understands -e -n
 		ECHO="$PWD/echo-ne"
 		test -x "$ECHO" || {
-			gcc -Os -o "$ECHO" ../scripts/echo.c || exit 1
+			echo_src=../scripts/echo.c
+			if test x"$srcdir" != x"" && test -f "$srcdir/../scripts/echo.c"; then
+				echo_src="$srcdir/../scripts/echo.c"
+			fi
+			${HOSTCC:-gcc} -Os -o "$ECHO" "$echo_src" || exit 1
 		}
 	}
 	export ECHO
-- 
2.39.5 (Apple Git-154)