[Buildroot] [PATCH 1/2] package/infras: do not conditionally set empty variables
Yann E. MORIN
yann.morin.1998 at free.fr
Tue Nov 9 17:01:44 UTC 2021
Setting an unset variable to an empty value is useless in make; an unset
variable just expands to an empty string anyway. So what we do currently
has no side effect:
variable set and not empty -> variable not modified
variable set and empty -> variable not modified
variable unset -> set to an empty string
However, additional variables do have an impact on the parsing time of
the Makefiles, and the more variables, the more collisions in the hash
table used internally by make, which slows down the parsing.
By dropping those conditionally-set-empty variables, we gain about 3%:
Run Before After
1 5.572 5.325
2 5.434 5.354
3 5.490 5.320
4 5.525 5.330
5 5.476 5.330
6 5.511 5.434
7 5.498 5.388
8 5.524 5.371
9 5.479 5.346
10 5.637 5.324
Mean: 5.515 5.352
Yeah, 0.163s does not look like much, and this does not make
autocompletion any more usable. Still, that 3% gain is not to be
ashamed of either.
Note that there are 3 others case where we do set empty variables, but
those are unconditional and serve other purposes:
- pkg-virtual: this is done on purpose to avoid a bug when the
environment may have TOOLCHAIN_VERSION or _SOURCE set, and we really
want those to be empty, so the assignment is not conditional;
- pkg-python: the reason for setting those to empty is dubious at
best; it's been there since the inception of the python infra, back
in 2013; still, the case is different than this patch addresses;
- pkg-toolchain-external: this is the case for a toolchain already
installed, so indeed we want to set _SOURCE and _VERSION to empty.
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout at mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
---
package/pkg-autotools.mk | 4 ----
package/pkg-cmake.mk | 4 ----
package/pkg-generic.mk | 27 ---------------------------
package/pkg-kconfig.mk | 3 ---
package/pkg-meson.mk | 4 ----
package/pkg-python.mk | 4 ----
package/pkg-qmake.mk | 4 ----
package/pkg-waf.mk | 5 -----
8 files changed, 55 deletions(-)
diff --git a/package/pkg-autotools.mk b/package/pkg-autotools.mk
index daa688dab6..717ff81593 100644
--- a/package/pkg-autotools.mk
+++ b/package/pkg-autotools.mk
@@ -160,10 +160,6 @@ ifeq ($(4),host)
$(2)_AUTORECONF_OPTS ?= $$($(3)_AUTORECONF_OPTS)
endif
-$(2)_CONF_ENV ?=
-$(2)_CONF_OPTS ?=
-$(2)_MAKE_ENV ?=
-$(2)_MAKE_OPTS ?=
$(2)_INSTALL_OPTS ?= install
$(2)_INSTALL_STAGING_OPTS ?= DESTDIR=$$(STAGING_DIR) install
$(2)_INSTALL_TARGET_OPTS ?= DESTDIR=$$(TARGET_DIR) install
diff --git a/package/pkg-cmake.mk b/package/pkg-cmake.mk
index 4ee100a0c6..3b1db35fb6 100644
--- a/package/pkg-cmake.mk
+++ b/package/pkg-cmake.mk
@@ -51,11 +51,7 @@ endif
define inner-cmake-package
-$(2)_CONF_ENV ?=
-$(2)_CONF_OPTS ?=
$(2)_MAKE ?= $$(MAKE)
-$(2)_MAKE_ENV ?=
-$(2)_MAKE_OPTS ?=
$(2)_INSTALL_OPTS ?= install
$(2)_INSTALL_STAGING_OPTS ?= DESTDIR=$$(STAGING_DIR) install/fast
$(2)_INSTALL_TARGET_OPTS ?= DESTDIR=$$(TARGET_DIR) install/fast
diff --git a/package/pkg-generic.mk b/package/pkg-generic.mk
index ded5176428..ab48240283 100644
--- a/package/pkg-generic.mk
+++ b/package/pkg-generic.mk
@@ -538,8 +538,6 @@ $(2)_DIR = $$(BUILD_DIR)/$$($(2)_BASENAME)
ifndef $(2)_SUBDIR
ifdef $(3)_SUBDIR
$(2)_SUBDIR = $$($(3)_SUBDIR)
- else
- $(2)_SUBDIR ?=
endif
endif
@@ -836,31 +834,6 @@ $(2)_EXTRACT_CMDS ?= \
$$(TAR_OPTIONS) -)
# pre/post-steps hooks
-$(2)_PRE_DOWNLOAD_HOOKS ?=
-$(2)_POST_DOWNLOAD_HOOKS ?=
-$(2)_PRE_EXTRACT_HOOKS ?=
-$(2)_POST_EXTRACT_HOOKS ?=
-$(2)_PRE_RSYNC_HOOKS ?=
-$(2)_POST_RSYNC_HOOKS ?=
-$(2)_PRE_PATCH_HOOKS ?=
-$(2)_POST_PATCH_HOOKS ?=
-$(2)_PRE_CONFIGURE_HOOKS ?=
-$(2)_POST_CONFIGURE_HOOKS ?=
-$(2)_PRE_BUILD_HOOKS ?=
-$(2)_POST_BUILD_HOOKS ?=
-$(2)_PRE_INSTALL_HOOKS ?=
-$(2)_POST_INSTALL_HOOKS ?=
-$(2)_PRE_INSTALL_STAGING_HOOKS ?=
-$(2)_POST_INSTALL_STAGING_HOOKS ?=
-$(2)_PRE_INSTALL_TARGET_HOOKS ?=
-$(2)_POST_INSTALL_TARGET_HOOKS ?=
-$(2)_PRE_INSTALL_IMAGES_HOOKS ?=
-$(2)_POST_INSTALL_IMAGES_HOOKS ?=
-$(2)_PRE_LEGAL_INFO_HOOKS ?=
-$(2)_POST_LEGAL_INFO_HOOKS ?=
-$(2)_TARGET_FINALIZE_HOOKS ?=
-$(2)_ROOTFS_PRE_CMD_HOOKS ?=
-
$(2)_POST_PREPARE_HOOKS += FIXUP_PYTHON_SYSCONFIGDATA
ifeq ($$($(2)_TYPE),target)
diff --git a/package/pkg-kconfig.mk b/package/pkg-kconfig.mk
index 23a291fccf..32dcfea0bc 100644
--- a/package/pkg-kconfig.mk
+++ b/package/pkg-kconfig.mk
@@ -81,9 +81,6 @@ define inner-kconfig-package
# Default values
$(2)_MAKE ?= $$(MAKE)
$(2)_KCONFIG_EDITORS ?= menuconfig
-$(2)_KCONFIG_OPTS ?=
-$(2)_KCONFIG_FIXUP_CMDS ?=
-$(2)_KCONFIG_FRAGMENT_FILES ?=
$(2)_KCONFIG_DOTCONFIG ?= .config
$(2)_KCONFIG_SUPPORTS_DEFCONFIG ?= YES
diff --git a/package/pkg-meson.mk b/package/pkg-meson.mk
index 16a90d157b..ec535174b6 100644
--- a/package/pkg-meson.mk
+++ b/package/pkg-meson.mk
@@ -45,10 +45,6 @@ NINJA_OPTS = $(if $(VERBOSE),-v) -j$(PARALLEL_JOBS)
define inner-meson-package
-$(2)_CONF_ENV ?=
-$(2)_CONF_OPTS ?=
-$(2)_NINJA_ENV ?=
-
#
# Configure step. Only define it if not already defined by the package
# .mk file. And take care of the differences between host and target
diff --git a/package/pkg-python.mk b/package/pkg-python.mk
index e6b81bdfd3..ce0fc97283 100644
--- a/package/pkg-python.mk
+++ b/package/pkg-python.mk
@@ -108,10 +108,6 @@ HOST_PKG_PYTHON_SETUPTOOLS_INSTALL_OPTS = \
define inner-python-package
-$(2)_ENV ?=
-$(2)_BUILD_OPTS ?=
-$(2)_INSTALL_OPTS ?=
-
ifndef $(2)_SETUP_TYPE
ifdef $(3)_SETUP_TYPE
$(2)_SETUP_TYPE = $$($(3)_SETUP_TYPE)
diff --git a/package/pkg-qmake.mk b/package/pkg-qmake.mk
index deb033c1d6..4dcaf6dd62 100644
--- a/package/pkg-qmake.mk
+++ b/package/pkg-qmake.mk
@@ -40,10 +40,6 @@ endef
define inner-qmake-package
-$(2)_CONF_ENV ?=
-$(2)_CONF_OPTS ?=
-$(2)_MAKE_ENV ?=
-$(2)_MAKE_OPTS ?=
$(2)_INSTALL_STAGING_OPTS ?= install
$(2)_INSTALL_TARGET_OPTS ?= $$($(2)_INSTALL_STAGING_OPTS)
diff --git a/package/pkg-waf.mk b/package/pkg-waf.mk
index 038d89454e..a593476a69 100644
--- a/package/pkg-waf.mk
+++ b/package/pkg-waf.mk
@@ -49,11 +49,6 @@ else
$(2)_WAF ?= ./waf
endif
-$(2)_BUILD_OPTS ?=
-$(2)_INSTALL_STAGING_OPTS ?=
-$(2)_INSTALL_TARGET_OPTS ?=
-$(2)_WAF_OPTS ?=
-
#
# Configure step. Only define it if not already defined by the package
# .mk file.
--
2.25.1
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