linux-kernel - [PATCH 16/17] selftests/nolibc: "sysroot" target installs a local copy of the sysroot

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Date:   Tue, 19 Jul 2022 23:44:48 +0200
From:   Willy Tarreau <w@....eu>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Pranith Kumar <bobby.prani@...il.com>,
        Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        David Laight <David.Laight@...LAB.COM>,
        Mark Brown <broonie@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH 16/17] selftests/nolibc: "sysroot" target installs a local copy of the sysroot

It's not convenient to rely on a sysroot built in another directory,
especially when running cross-compilation tests, where one has to
switch back and forth between directories.

Let's make it possible to install the sysroot directly in the test
directory. It's not big and even benefits from being copied by arch
so that it's easier to switch between archs if needed. The new
"sysroot" target does this, it just calls "headers_standalone" from
nolibc to install the sysroot right here.

Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/testing/selftests/nolibc/Makefile | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 7c1f5360f454..210f5369fdfc 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -67,9 +67,16 @@ LDFLAGS := -s
 
 all: nolibc-test
 
-nolibc-test: nolibc-test.c
+sysroot: sysroot/$(ARCH)/include
+
+sysroot/$(ARCH)/include:
+	$(QUIET_MKDIR)mkdir -p sysroot
+	$(Q)$(MAKE) -C ../../../include/nolibc ARCH=$(ARCH) OUTPUT=$(CURDIR)/sysroot/ headers_standalone
+	$(Q)mv sysroot/sysroot sysroot/$(ARCH)
+
+nolibc-test: nolibc-test.c sysroot/$(ARCH)/include
 	$(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ \
-	  -nostdlib -static -include ../../../include/nolibc/nolibc.h $^ -lgcc
+	  -nostdlib -static -Isysroot/$(ARCH)/include $< -lgcc
 
 initramfs: nolibc-test
 	$(QUIET_MKDIR)mkdir -p initramfs
@@ -93,6 +100,8 @@ rerun:
 	$(Q)grep -w FAIL "$(CURDIR)/run.out" && echo "See all results in $(CURDIR)/run.out" || echo "$$(grep -c ^[0-9].*OK $(CURDIR)/run.out) test(s) passed."
 
 clean:
+	$(call QUIET_CLEAN, sysroot)
+	$(Q)rm -rf sysroot
 	$(call QUIET_CLEAN, nolibc-test)
 	$(Q)rm -f nolibc-test
 	$(call QUIET_CLEAN, initramfs)
-- 
2.17.5