On Fri, Jun 16, 2023 at 11:57 PM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> With commit 9da0763bdd82 ("kbuild: Use relative path when building in
> a subdir of the source tree"), compiler messages in out-of-tree builds
> include relative paths, which are relative to the build directory, not
> the directory where make was started.
>
> To help IDEs/editors find the source files, Kbuild lets GNU Make print
> "Entering directory ..." when it changes the working directory. It has
> been working fine for a long time, but David reported it is broken with
> the latest GNU Make.
>
> The behavior was changed by GNU Make commit 8f9e7722ff0f ("[SV 63537]
> Fix setting -w in makefiles"). Previously, setting --no-print-directory
> to MAKEFLAGS only affected child makes, but it is now interpreted in
> the current make as soon as it is set.
>
> [test code]
>
> $ cat /tmp/Makefile
> ifneq ($(SUBMAKE),1)
> MAKEFLAGS += --no-print-directory
> all: ; $(MAKE) SUBMAKE=1
> else
> all: ; :
> endif
>
> [before 8f9e7722ff0f]
>
> $ make -C /tmp
> make: Entering directory '/tmp'
> make SUBMAKE=1
> :
> make: Leaving directory '/tmp'
>
> [after 8f9e7722ff0f]
>
> $ make -C /tmp
> make SUBMAKE=1
> :
>
> Previously, the effect of --no-print-directory was delayed until Kbuild
> started the directory descending, but it is no longer true with GNU Make
> 4.4.1.
>
> This commit adds one more recursion to cater to GNU Make >= 4.4.1.
>
> When Kbuild needs to change the working directory, __submake will be
> executed twice.
>
> __submake without --no-print-directory --> show "Entering directory ..."
> __submake with --no-print-directory --> parse the rest of Makefile
>
> We end up with one more recursion than needed for GNU Make < 4.4.1, but
> I do not want to complicate the version check.
>
> Reported-by: David Howells <dhowells@xxxxxxxxxx>
> Closes: https://lore.kernel.org/all/2427604.1686237298@xxxxxxxxxxxxxxxxxxxxxx/
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
> ---
>
> Changes in v2:
> - Fix the code. V1 did not work.
> - Remove the version check to simplify the code
This patch broke 'make rpm-pkg' (and 'make snap-pkg' as well).
I will send v3.
--
Best Regards
Masahiro Yamada
