diff options
| author | Yann E. MORIN <yann.morin.1998@free.fr> | 2015-11-04 22:42:39 +0100 |
|---|---|---|
| committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2015-11-29 19:04:53 +0100 |
| commit | 376fda8f99cd0511c03be4b937e9684a565745da (patch) | |
| tree | 623bad56140721e293fad9338441eb4bf1207a6a /Makefile | |
| parent | f8b8251a921a7fa4e05b545e503cfc4e736d1d0d (diff) | |
core/printvars: allow dumping a set of variables
Dumping our 176164 variables can take quite some time (~12s here). What
takes the most time is sorting the variables (~9s), followed by the
parsing of our Makefiles (~3s), with the actual printing in the noise.
However, sometimes only one or a few variables are needed. For example,
one may want to retrieve the Linux build dir from a post-build hook (to
get the Linux' actual .config after our fixups and check for various
features).
Add the possibility to only dump the variables listed in $(VAR) which
must be passed as a make argument, like so:
$ make -s printvars VARS="LINUX_DIR TOPDIR O"
LINUX_DIR=/home/ymorin/dev/buildroot/O/build/linux-4.3 ($(BUILD_DIR)/$(LINUX_BASE_NAME))
O=/home/ymorin/dev/buildroot/O/. (/home/ymorin/dev/buildroot/O/.)
TOPDIR=/home/ymorin/dev/buildroot/buildroot (/home/ymorin/dev/buildroot/buildroot)
It is also possible to use make-appterns, like:
$ make -s printvars VARS="BUSYBOX_%"
This is much faster (the time is just about the time it takes to parse
our Makefiles, 3s here) and easier to parse.
[Thomas: improve comment above the printvars target.]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 7 |
1 files changed, 5 insertions, 2 deletions
@@ -823,10 +823,13 @@ ifeq ($(NEED_WRAPPER),y) $(Q)$(TOPDIR)/support/scripts/mkmakefile $(TOPDIR) $(O) endif -# printvars prints all the variables currently defined in our Makefiles +# printvars prints all the variables currently defined in our +# Makefiles. Alternatively, if a non-empty VARS variable is passed, +# only the variables matching the make pattern passed in VARS are +# displayed. printvars: @$(foreach V, \ - $(sort $(.VARIABLES)), \ + $(sort $(if $(VARS),$(filter $(VARS),$(.VARIABLES)),$(.VARIABLES))), \ $(if $(filter-out environment% default automatic, \ $(origin $V)), \ $(info $V=$($V) ($(value $V))))) |