linux-kernel - [PATCH] kbuild: Use $(obj)/%.cc to fix host C++ module builds

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Message-Id: <20240624-kbuild-fix-xconfig-v1-1-7c06eae6d3aa@avm.de>
Date: Mon, 24 Jun 2024 13:12:14 +0200
From: Nicolas Schier <n.schier@....de>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Rolf Eike Beer <eb@...ix.com>
Subject: [PATCH] kbuild: Use $(obj)/%.cc to fix host C++ module builds

Use $(obj)/ instead of $(src)/ prefix when building C++ modules for
host, as explained in commit b1992c3772e6 ("kbuild: use $(src) instead
of $(srctree)/$(src) for source directory").  This fixes build failures
of 'xconfig':

    $ make O=build/ xconfig
    make[1]: Entering directory '/data/linux/kbuild-review/build'
      GEN     Makefile
    make[3]: *** No rule to make target '../scripts/kconfig/qconf-moc.cc', needed by 'scripts/kconfig/qconf-moc.o'.  Stop.

Fixes: b1992c3772e6 ("kbuild: use $(src) instead of $(srctree)/$(src) for source directory")
Reported-by: Rolf Eike Beer <eb@...ix.com>
Signed-off-by: Nicolas Schier <n.schier@....de>
---
 scripts/Makefile.host | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index d35f55e0d141..e85be7721a48 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -146,7 +146,7 @@ $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 # Create .o file from a single .cc (C++) file
 quiet_cmd_host-cxxobjs	= HOSTCXX $@
       cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
-$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
+$(host-cxxobjs): $(obj)/%.o: $(obj)/%.cc FORCE
 	$(call if_changed_dep,host-cxxobjs)
 
 # Create executable from a single Rust crate (which may consist of

---
base-commit: 224a21441b0925ce1e60afb27629773a522c946e
change-id: 20240624-kbuild-fix-xconfig-f0e95d0d5b27

Best regards,
-- 
Nicolas Schier