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Makefile: Use computed header dependencies if the compiler supports it 

Previously you had to manually define COMPUTE_HEADER_DEPENDENCIES to
enable this feature. It seemed a bit sad that such a useful feature
had to be enabled manually.

To avoid the small overhead we don't do the auto-detection if
COMPUTE_HEADER_DEPENDENCIES is already set.

Signed-off-by: Fredrik Kuivinen <frekui@gmail.com>
Acked-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Fredrik Kuivinen 2011-08-18 20:34:39 +02:00 committed by Junio C Hamano
parent f85a051d13
commit 111ee18c31
1 changed files with 9 additions and 4 deletions
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13
Makefile
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@ -250,10 +250,6 @@ all::
# DEFAULT_EDITOR='$GIT_FALLBACK_EDITOR',
# DEFAULT_EDITOR='"C:\Program Files\Vim\gvim.exe" --nofork'
#
# Define COMPUTE_HEADER_DEPENDENCIES if your compiler supports the -MMD option
# and you want to avoid rebuilding objects when an unrelated header file
# changes.
#
# Define CHECK_HEADER_DEPENDENCIES to check for problems in the hard-coded
# dependency rules.
#
@ -1236,6 +1232,15 @@ endif
ifdef CHECK_HEADER_DEPENDENCIES
COMPUTE_HEADER_DEPENDENCIES =
USE_COMPUTED_HEADER_DEPENDENCIES =
else
ifndef COMPUTE_HEADER_DEPENDENCIES
dep_check = $(shell sh -c \
'$(CC) -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
endif
endif
ifdef COMPUTE_HEADER_DEPENDENCIES