tools: ynl: Allow cross-compiling ynl and associated tools

The ynl tool and libraries may be built standalone or through the
drivers/net/hw selftest machinery. This may target a different arch, so
we need to take the CROSS_COMPILE variable into account for LLVM and
gcc.

Let's include the tools/scripts/Makefile.include that deals with the
CC/AR resolution.

Fixup the ynltool CFLAGS handling to use +=, so that we don't override
the ones set in Makefile.include.

Makefile.include also sets the Q variable for verbose mode, so we can
drop it from the ynltool Makefile. This will allow properly selection
the verbosity of ynltool builds with the V=1 make flag.

Reviewed-by: Matthieu Baerts (Netdev Foundation) <matttbe@kernel.org>
Signed-off-by: Maxime Chevallier (Netdev Foundation) <maxime.chevallier@bootlin.com>
Link: https://patch.msgid.link/20260907161438.755125-2-maxime.chevallier@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/Makefile

@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
+include ../../scripts/Makefile.include
 include ../../scripts/Makefile.arch
 
 INSTALL	?= install

tools/net/ynl/generated/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
-CC=gcc
+include ../../../scripts/Makefile.include
+
 CFLAGS += -std=gnu11 -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow \
 	-I../lib/ -idirafter $(UAPI_PATH)
 ifeq ("$(DEBUG)","1")

tools/net/ynl/lib/Makefile

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
-CC=gcc
+include ../../../scripts/Makefile.include
+
 CFLAGS += -std=gnu11 -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow
 ifeq ("$(DEBUG)","1")
   CFLAGS += -g -fsanitize=address -fsanitize=leak -static-libasan

tools/net/ynl/tests/Makefile

@@ -2,8 +2,8 @@
 # Makefile for YNL tests
 
 include ../Makefile.deps
+include ../../../scripts/Makefile.include
 
-CC=gcc
 CFLAGS += -std=gnu11 -O2 -W -Wall -Wextra -Wno-unused-parameter -Wshadow \
 	-I../lib/ -I../generated/ -I../../../testing/selftests/ \
 	-idirafter $(UAPI_PATH)

tools/net/ynl/ynltool/Makefile

@@ -1,12 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0-only
 
 include ../Makefile.deps
+include ../../../scripts/Makefile.include
 
 INSTALL	?= install
 prefix  ?= /usr
 
-CC := gcc
-CFLAGS := -Wall -Wextra -Werror -O2
+CFLAGS += -Wall -Wextra -Werror -O2
 ifeq ("$(DEBUG)","1")
   CFLAGS += -g -fsanitize=address -fsanitize=leak -static-libasan
 endif
@@ -27,8 +27,6 @@ include $(wildcard *.d)
 
 all: $(YNLTOOL)
 
-Q = @
-
 $(YNLTOOL): ../libynl.a $(OBJS)
 	$(Q)echo -e "\tLINK $@"
 	$(Q)$(CC) $(CFLAGS) -o $@ $(OBJS) ../libynl.a -lm