[PATCH v2] tools build: Provide consistent build options for fixdep

[Alexander Gordeev <agordeev@linux.ibm.com>]

The fixdep binary is being compiled and linked in one step. While
the host linker flags are passed to the compiler the host compiler
flags are missed.

That leads to build errors at least on x86_64, arm64 and s390 as
result of the compiler vs linker flags inconsistency. For example,
during RPM package build redhat-hardened-ld script is provided to
gcc, while redhat-hardened-cc1 script is missed.

Provide both KBUILD_HOSTCFLAGS and KBUILD_HOSTLDFLAGS to avoid that.

Closes: https://lore.kernel.org/lkml/99ae0d34-ed76-4ca0-a9fd-c337da33c9f9@leemhuis.info/
Fixes: ea974028a049 ("tools build: Avoid circular .fixdep-in.o.cmd issues")
Tested-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
---

This patch is against kernel-next next-20240815 tag

v2:
- missing tags added
- commit message adjusted

---
 tools/build/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/build/Makefile b/tools/build/Makefile
index fea3cf647f5b..18ad131f6ea7 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -44,4 +44,4 @@ ifneq ($(wildcard $(TMP_O)),)
 endif
 
 $(OUTPUT)fixdep: $(srctree)/tools/build/fixdep.c
-	$(QUIET_CC)$(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ $<
+	$(QUIET_CC)$(HOSTCC) $(KBUILD_HOSTCFLAGS) $(KBUILD_HOSTLDFLAGS) -o $@ $<
-- 
2.43.0