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Makefile: add option to disable automatic dependency generation 

Now that the COMPUTE_HEADER_DEPENDENCIES feature is turned on
automatically for compilers that support it (see v1.7.8-rc0~142^2~1,
2011-08-18), there is no easy way to force it off.  For example,
setting COMPUTE_HEADER_DEPENDENCIES to the empty string in config.mak
just tells the makefile to treat it as undefined and run a test
command to see if the -MMD option is supported.

So allow setting COMPUTE_HEADER_DEPENDENCIES=no to explicitly force
the feature off.  The new semantics:

 - "yes" means to explicitly enable the feature
 - "no" means to disable it
 - "auto" means to autodetect

The default is still "auto".  Any value other than these three will
cause the build to error out with a descriptive message so typos and
stale settings in config.mak don't result in mysterious behavior.

	Makefile:1278: *** please set COMPUTE_HEADER_DEPENDENCIES to
	yes, no, or auto (not "1").  Stop.

So now when someone using a compiler without -MMD support reports
trouble building git, you can reproduce it by running "make
COMPUTE_HEADER_DEPENDENCIES=no".

Suggested-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Improved-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Tested-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Nieder 2011-11-18 03:58:21 -06:00 committed by Junio C Hamano
parent 4c00c852b3
commit 024c843d47
1 changed files with 24 additions and 7 deletions
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31
Makefile
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@ -250,6 +250,12 @@ all::
# DEFAULT_EDITOR='$GIT_FALLBACK_EDITOR',
# DEFAULT_EDITOR='"C:\Program Files\Vim\gvim.exe" --nofork'
#
# Define COMPUTE_HEADER_DEPENDENCIES to "yes" if you want dependencies on
# header files to be automatically computed, to avoid rebuilding objects when
# an unrelated header file changes. Define it to "no" to use the hard-coded
# dependency rules. The default is "auto", which means to use computed header
# dependencies if your compiler is detected to support it.
#
# Define CHECK_HEADER_DEPENDENCIES to check for problems in the hard-coded
# dependency rules.
#
@ -1246,21 +1252,32 @@ endif
endif
ifdef CHECK_HEADER_DEPENDENCIES
COMPUTE_HEADER_DEPENDENCIES =
COMPUTE_HEADER_DEPENDENCIES = no
USE_COMPUTED_HEADER_DEPENDENCIES =
else
endif
ifndef COMPUTE_HEADER_DEPENDENCIES
COMPUTE_HEADER_DEPENDENCIES = auto
endif
ifeq ($(COMPUTE_HEADER_DEPENDENCIES),auto)
dep_check = $(shell $(CC) $(ALL_CFLAGS) \
-c -MF /dev/null -MMD -MP -x c /dev/null -o /dev/null 2>&1; \
echo $$?)
ifeq ($(dep_check),0)
COMPUTE_HEADER_DEPENDENCIES=YesPlease
endif
override COMPUTE_HEADER_DEPENDENCIES = yes
else
override COMPUTE_HEADER_DEPENDENCIES = no
endif
endif
ifdef COMPUTE_HEADER_DEPENDENCIES
ifeq ($(COMPUTE_HEADER_DEPENDENCIES),yes)
USE_COMPUTED_HEADER_DEPENDENCIES = YesPlease
else
ifneq ($(COMPUTE_HEADER_DEPENDENCIES),no)
$(error please set COMPUTE_HEADER_DEPENDENCIES to yes, no, or auto \
(not "$(COMPUTE_HEADER_DEPENDENCIES)"))
endif
endif
ifdef SANE_TOOL_PATH
@ -1907,7 +1924,7 @@ OBJECTS := $(GIT_OBJS) $(XDIFF_OBJS) $(VCSSVN_OBJS)
dep_files := $(foreach f,$(OBJECTS),$(dir $f).depend/$(notdir $f).d)
dep_dirs := $(addsuffix .depend,$(sort $(dir $(OBJECTS))))
ifdef COMPUTE_HEADER_DEPENDENCIES
ifeq ($(COMPUTE_HEADER_DEPENDENCIES),yes)
$(dep_dirs):
@mkdir -p $@
@ -1920,7 +1937,7 @@ Please unset CHECK_HEADER_DEPENDENCIES and try again)
endif
endif
ifndef COMPUTE_HEADER_DEPENDENCIES
ifneq ($(COMPUTE_HEADER_DEPENDENCIES),yes)
ifndef CHECK_HEADER_DEPENDENCIES
dep_dirs =
missing_dep_dirs =