* [Buildroot] [PATCHv2] core/printvars: allow dumping a set of variables
@ 2015-11-04 21:42 Yann E. MORIN
2015-11-29 18:22 ` Thomas Petazzoni
0 siblings, 1 reply; 2+ messages in thread
From: Yann E. MORIN @ 2015-11-04 21:42 UTC (permalink / raw)
To: buildroot
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.
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
Changes v1 -> v2;
- accept make-patterns (Thomas)
---
Makefile | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
index 6d34ee2..222c818 100644
--- a/Makefile
+++ b/Makefile
@@ -832,9 +832,10 @@ ifeq ($(NEED_WRAPPER),y)
endif
# printvars prints all the variables currently defined in our Makefiles
+# or only the variables specified in $(VARS)
printvars:
@$(foreach V, \
- $(sort $(.VARIABLES)), \
+ $(sort $(if $(VARS),$(filter $(VARS),$(.VARIABLES)),$(.VARIABLES))), \
$(if $(filter-out environment% default automatic, \
$(origin $V)), \
$(info $V=$($V) ($(value $V)))))
--
1.9.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [Buildroot] [PATCHv2] core/printvars: allow dumping a set of variables
2015-11-04 21:42 [Buildroot] [PATCHv2] core/printvars: allow dumping a set of variables Yann E. MORIN
@ 2015-11-29 18:22 ` Thomas Petazzoni
0 siblings, 0 replies; 2+ messages in thread
From: Thomas Petazzoni @ 2015-11-29 18:22 UTC (permalink / raw)
To: buildroot
Dear Yann E. MORIN,
On Wed, 4 Nov 2015 22:42:39 +0100, Yann E. MORIN wrote:
> 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.
>
> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
>
> ---
> Changes v1 -> v2;
> - accept make-patterns (Thomas)
> ---
> Makefile | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
I've applied to next, after slightly improving the comment above the
printvars target. It is now:
# 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.
Thanks,
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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2015-11-04 21:42 [Buildroot] [PATCHv2] core/printvars: allow dumping a set of variables Yann E. MORIN
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