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
GNU Make 4.4.1.
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
MAKEFLAGS += --no-print-directory
all: ; :
[before 8f9e7722ff0f]
$ make -C /tmp
make: Entering directory '/tmp'
:
make: Leaving directory '/tmp'
[after 8f9e7722ff0f]
$ make -C /tmp
:
This commit restores the previous behavior for GNU Make >= 4.4.1.
Reported-by: David Howells <dhowells@xxxxxxxxxx>
Closes: https://lore.kernel.org/all/2427604.1686237298@xxxxxxxxxxxxxxxxxxxxxx/
Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
---
Makefile | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)
diff --git a/Makefile b/Makefile
index cc3fe09c4dec..9868186deb66 100644
--- a/Makefile
+++ b/Makefile
@@ -191,7 +191,7 @@ endif # ifneq ($(KBUILD_OUTPUT),)
ifeq ($(abs_objtree),$(CURDIR))
# Suppress "Entering directory ..." unless we are changing the work directory.
-MAKEFLAGS += --no-print-directory
+no-print-directory := --no-print-directory
else
need-sub-make := 1
endif
@@ -203,6 +203,15 @@ ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
$(error source directory cannot contain spaces or colons)
endif
+ifneq ($(filter jobserver-fifo,$(.FEATURES)),) # test $(MAKE_VERSION) >= 4.4
+ifeq ($(filter 4.4,$(MAKE_VERSION)),)
+# With GNU Make >= 4.4.1, a change in MAKEFLAGS takes effect as soon as it is
+# set. Run __sub-make all the time so that we can pass --no-print-directory
+# via the command line.
+need-sub-make := 1
+endif
+endif
+
ifneq ($(filter 3.%,$(MAKE_VERSION)),)
# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
# We need to invoke sub-make to avoid implicit rules in the top Makefile.
@@ -223,7 +232,8 @@ $(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 $(MAKECMDGOALS)
endif # need-sub-make
endif # sub_make_done
@@ -234,6 +244,8 @@ ifeq ($(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.
+# This line is needed to allow Make < 4.4.1 to skip __sub-make.
+# The newer Make versions runs __sub-make before seeing this line.
MAKEFLAGS += --no-print-directory
ifeq ($(abs_srctree),$(abs_objtree))
--
2.39.2
