[v2,05/11] Kbuild: don't add obj tree in additional includes
diff mbox

Message ID 20160615154553.3177021-6-arnd@arndb.de
State New
Headers show

Commit Message

Arnd Bergmann June 15, 2016, 3:45 p.m. UTC
When building with separate object directories and driver specific
Makefiles that add additional header include paths, Kbuild adjusts
the gcc flags so that we include both the directory in the source
tree and in the object tree.

However, due to another bug I fixed earlier, this did not actually
include the correct directory in the object tree, so we know that
we only really need the source tree here. Also, including the
object tree sometimes causes warnings about nonexisting directories
when the include path only exists in the source.

This changes the logic to only emit the -I argument for the srctree,
not for objects. We still need both $(srctree)/$(src) and $(obj)
though, so I'm adding them manually.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 scripts/Kbuild.include | 2 +-
 scripts/Makefile.lib   | 7 ++++---
 2 files changed, 5 insertions(+), 4 deletions(-)

Comments

Michal Marek July 18, 2016, 8:14 p.m. UTC | #1
On Wed, Jun 15, 2016 at 05:45:47PM +0200, Arnd Bergmann wrote:
> When building with separate object directories and driver specific
> Makefiles that add additional header include paths, Kbuild adjusts
> the gcc flags so that we include both the directory in the source
> tree and in the object tree.
> 
> However, due to another bug I fixed earlier, this did not actually
> include the correct directory in the object tree, so we know that
> we only really need the source tree here. Also, including the
> object tree sometimes causes warnings about nonexisting directories
> when the include path only exists in the source.
> 
> This changes the logic to only emit the -I argument for the srctree,
> not for objects. We still need both $(srctree)/$(src) and $(obj)
> though, so I'm adding them manually.
> 
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Hi Arnd,

I applied the series up to this patch to kbuild.git#kbuild. The rest
seem to be related but not dependent patches, so I'll leave it up to the
respective maintainers to pick them up. Is that OK with you?

Thanks,
Michal
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Patch
diff mbox

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index f8b45eb47ed3..15b196fc2f49 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -202,7 +202,7 @@  hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
 # Prefix -I with $(srctree) if it is not an absolute path.
 # skip if -I has no parameter
 addtree = $(if $(patsubst -I%,%,$(1)), \
-$(if $(filter-out -I/% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1))) $(1))
+$(if $(filter-out -I/% -I./% -I../%,$(1)),$(patsubst -I%,-I$(srctree)/%,$(1)),$(1)))
 
 # Find all -I options and call addtree
 flags = $(foreach o,$($(1)),$(if $(filter -I%,$(o)),$(call addtree,$(o)),$(o)))
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 76494e15417b..0a07f9014944 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -155,9 +155,10 @@  else
 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 #   and locates generated .h files
 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
-__c_flags	= $(call addtree,-I$(obj)) $(call flags,_c_flags)
-__a_flags	=                          $(call flags,_a_flags)
-__cpp_flags     =                          $(call flags,_cpp_flags)
+__c_flags	= $(if $(obj),-I$(srctree)/$(src) -I$(obj)) \
+		  $(call flags,_c_flags)
+__a_flags	= $(call flags,_a_flags)
+__cpp_flags     = $(call flags,_cpp_flags)
 endif
 
 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \