[PATCH v2 1/2] kbuild: revive "Entering directory" for Make >= 4.4.1

[PATCH v2 1/2] kbuild: revive "Entering directory" for Make >= 4.4.1

[Masahiro Yamada]

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@redhat.com>
Closes: https://lore.kernel.org/all/2427604.1686237298@warthog.procyon.org.uk/
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

Changes in v2:
  - Fix the code. V1 did not work.
  - Remove the version check to simplify the code

 Makefile | 36 ++++++++++++++++++++----------------
 1 file changed, 20 insertions(+), 16 deletions(-)

diff --git a/Makefile b/Makefile
index cc3fe09c4dec..916c1a7984b0 100644
--- a/Makefile
+++ b/Makefile
@@ -189,13 +189,6 @@ else
 abs_objtree := $(CURDIR)
 endif # ifneq ($(KBUILD_OUTPUT),)
 
-ifeq ($(abs_objtree),$(CURDIR))
-# Suppress "Entering directory ..." unless we are changing the work directory.
-MAKEFLAGS += --no-print-directory
-else
-need-sub-make := 1
-endif
-
 this-makefile := $(lastword $(MAKEFILE_LIST))
 abs_srctree := $(realpath $(dir $(this-makefile)))
 
@@ -214,6 +207,23 @@ endif
 export abs_srctree abs_objtree
 export sub_make_done := 1
 
+endif # sub_make_done
+
+ifeq ($(abs_objtree),$(CURDIR))
+# Suppress "Entering directory ..." if we are at the final work directory.
+no-print-directory := --no-print-directory
+else
+# Recursion to show "Entering directory ..."
+need-sub-make := 1
+endif
+
+ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
+# If --no-print-directory is unset, recurse once again to set it.
+# You may end up with recursing into __sub-make twice. This is due to the
+# behavior change for GNU Make 4.4.1.
+need-sub-make := 1
+endif
+
 ifeq ($(need-sub-make),1)
 
 PHONY += $(MAKECMDGOALS) __sub-make
@@ -223,18 +233,12 @@ $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
 
 # Invoke a second make in the output directory, passing relevant variables
 __sub-make:
-	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
+	$(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
+	-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
 
-endif # need-sub-make
-endif # sub_make_done
+else # need-sub-make
 
 # We process the rest of the Makefile if this is the final invocation of make
-ifeq ($(need-sub-make),)
-
-# Do not print "Entering directory ...",
-# but we want to display it when entering to the output directory
-# so that IDEs/editors are able to understand relative filenames.
-MAKEFLAGS += --no-print-directory
 
 ifeq ($(abs_srctree),$(abs_objtree))
         # building in the source tree
-- 
2.39.2

[PATCH v2 2/2] kbuild: respect GNU Make -w flag

[Masahiro Yamada]

Currently, -w (--print-directory) option is ignored, but it is better
to respect the user's choice.

This commit changes the behavior of "Entering directory ..." logging.

If -w (or --print-directory) is given via the command line or the
MAKEFLAGS environment variable, print "Entering directory ..." for every
sub make.

If --no-print-directory is given via the command line or the MAKEFLAGS
environment variable, suppress "Entering directory ..." completely.

If none of them is given, print "Entering directory ..." only when Kbuild
changes the working directory. (default)

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

Changes in v2:
  - new patch

 Makefile | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/Makefile b/Makefile
index 916c1a7984b0..3867cdc3de5d 100644
--- a/Makefile
+++ b/Makefile
@@ -38,6 +38,12 @@ __all:
 # descending is started. They are now explicitly listed as the
 # prepare rule.
 
+ifeq ($(filter 3.%,$(MAKE_VERSION)),)
+short-opts := $(firstword -$(MAKEFLAGS))
+else
+short-opts := $(filter-out --%,$(MAKEFLAGS))
+endif
+
 ifneq ($(sub_make_done),1)
 
 # Do not use make's built-in rules and variables
@@ -91,12 +97,6 @@ endif
 # commands
 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
 
-ifeq ($(filter 3.%,$(MAKE_VERSION)),)
-short-opts := $(firstword -$(MAKEFLAGS))
-else
-short-opts := $(filter-out --%,$(MAKEFLAGS))
-endif
-
 ifneq ($(findstring s,$(short-opts)),)
 quiet=silent_
 override KBUILD_VERBOSE :=
@@ -217,12 +217,16 @@ else
 need-sub-make := 1
 endif
 
+ifeq ($(findstring w, $(short-opts)),)
 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
 # If --no-print-directory is unset, recurse once again to set it.
 # You may end up with recursing into __sub-make twice. This is due to the
 # behavior change for GNU Make 4.4.1.
 need-sub-make := 1
 endif
+else
+no-print-directory :=
+endif
 
 ifeq ($(need-sub-make),1)
 
-- 
2.39.2

Re: [PATCH v2 1/2] kbuild: revive "Entering directory" for Make >= 4.4.1

[Nicolas Schier]

On Fri, Jun 16, 2023 at 11:57:50PM +0900, Masahiro Yamada 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@redhat.com>
> Closes: https://lore.kernel.org/all/2427604.1686237298@warthog.procyon.org.uk/
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
> 
> Changes in v2:
>   - Fix the code. V1 did not work.
>   - Remove the version check to simplify the code

Tested-by: Nicolas Schier <n.schier@avm.de>

> 
>  Makefile | 36 ++++++++++++++++++++----------------
>  1 file changed, 20 insertions(+), 16 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index cc3fe09c4dec..916c1a7984b0 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -189,13 +189,6 @@ else
>  abs_objtree := $(CURDIR)
>  endif # ifneq ($(KBUILD_OUTPUT),)
>  
> -ifeq ($(abs_objtree),$(CURDIR))
> -# Suppress "Entering directory ..." unless we are changing the work directory.
> -MAKEFLAGS += --no-print-directory
> -else
> -need-sub-make := 1
> -endif
> -
>  this-makefile := $(lastword $(MAKEFILE_LIST))
>  abs_srctree := $(realpath $(dir $(this-makefile)))
>  
> @@ -214,6 +207,23 @@ endif
>  export abs_srctree abs_objtree
>  export sub_make_done := 1
>  
> +endif # sub_make_done
> +
> +ifeq ($(abs_objtree),$(CURDIR))
> +# Suppress "Entering directory ..." if we are at the final work directory.
> +no-print-directory := --no-print-directory
> +else
> +# Recursion to show "Entering directory ..."
> +need-sub-make := 1
> +endif
> +
> +ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
> +# If --no-print-directory is unset, recurse once again to set it.
> +# You may end up with recursing into __sub-make twice. This is due to the
> +# behavior change for GNU Make 4.4.1.
> +need-sub-make := 1
> +endif
> +
>  ifeq ($(need-sub-make),1)
>  
>  PHONY += $(MAKECMDGOALS) __sub-make
> @@ -223,18 +233,12 @@ $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
>  
>  # Invoke a second make in the output directory, passing relevant variables
>  __sub-make:
> -	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
> +	$(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
> +	-f $(abs_srctree)/Makefile $(MAKECMDGOALS)
>  
> -endif # need-sub-make
> -endif # sub_make_done
> +else # need-sub-make
>  
>  # We process the rest of the Makefile if this is the final invocation of make
> -ifeq ($(need-sub-make),)
> -
> -# Do not print "Entering directory ...",
> -# but we want to display it when entering to the output directory
> -# so that IDEs/editors are able to understand relative filenames.
> -MAKEFLAGS += --no-print-directory
>  
>  ifeq ($(abs_srctree),$(abs_objtree))
>          # building in the source tree
> -- 
> 2.39.2
> 

Re: [PATCH v2 2/2] kbuild: respect GNU Make -w flag

[Nicolas Schier]

On Fri, Jun 16, 2023 at 11:57:51PM +0900, Masahiro Yamada wrote:
> Currently, -w (--print-directory) option is ignored, but it is better
> to respect the user's choice.
> 
> This commit changes the behavior of "Entering directory ..." logging.
> 
> If -w (or --print-directory) is given via the command line or the
> MAKEFLAGS environment variable, print "Entering directory ..." for every
> sub make.
> 
> If --no-print-directory is given via the command line or the MAKEFLAGS
> environment variable, suppress "Entering directory ..." completely.
> 
> If none of them is given, print "Entering directory ..." only when Kbuild
> changes the working directory. (default)
> 
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---

Tested-by: Nicolas Schier <n.schier@avm.de>

> 
> Changes in v2:
>   - new patch
> 
>  Makefile | 16 ++++++++++------
>  1 file changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/Makefile b/Makefile
> index 916c1a7984b0..3867cdc3de5d 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -38,6 +38,12 @@ __all:
>  # descending is started. They are now explicitly listed as the
>  # prepare rule.
>  
> +ifeq ($(filter 3.%,$(MAKE_VERSION)),)
> +short-opts := $(firstword -$(MAKEFLAGS))
> +else
> +short-opts := $(filter-out --%,$(MAKEFLAGS))
> +endif
> +
>  ifneq ($(sub_make_done),1)
>  
>  # Do not use make's built-in rules and variables
> @@ -91,12 +97,6 @@ endif
>  # commands
>  # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS.
>  
> -ifeq ($(filter 3.%,$(MAKE_VERSION)),)
> -short-opts := $(firstword -$(MAKEFLAGS))
> -else
> -short-opts := $(filter-out --%,$(MAKEFLAGS))
> -endif
> -
>  ifneq ($(findstring s,$(short-opts)),)
>  quiet=silent_
>  override KBUILD_VERBOSE :=
> @@ -217,12 +217,16 @@ else
>  need-sub-make := 1
>  endif
>  
> +ifeq ($(findstring w, $(short-opts)),)
>  ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
>  # If --no-print-directory is unset, recurse once again to set it.
>  # You may end up with recursing into __sub-make twice. This is due to the
>  # behavior change for GNU Make 4.4.1.
>  need-sub-make := 1
>  endif
> +else
> +no-print-directory :=
> +endif
>  
>  ifeq ($(need-sub-make),1)
>  
> -- 
> 2.39.2
> 

Re: [PATCH v2 1/2] kbuild: revive "Entering directory" for Make >= 4.4.1

[Masahiro Yamada]

On Fri, Jun 16, 2023 at 11:57 PM Masahiro Yamada <masahiroy@kernel.org> 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@redhat.com>
> Closes: https://lore.kernel.org/all/2427604.1686237298@warthog.procyon.org.uk/
> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> ---
>
> 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