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| author |  Fredrik Kuivinen <frekui@gmail.com> | 2011-08-18 20:34:39 +0200 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2011-08-18 13:54:58 -0700 |
| commit | 111ee18c31f9bac9436426399355facc79238566 (patch) | |
| tree | eb27c60f04c22ead24fabcdb762a8876be101bf1 | |
| parent | Update draft release notes to 1.7.7 (diff) | |
| download | tgif-111ee18c31f9bac9436426399355facc79238566.tar.xz | |
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>
| -rw-r--r-- | Makefile | 13 |
1 files changed, 9 insertions, 4 deletions
@@ -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 |