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Add BUILD_BROKEN_NINJA_USES_ENV_VARS

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See the Changes.md and the paired soong change for more information.

Test: Add BUILD_BROKEN_NINJA_USES_ENV_VARS := OLDPWD
      ALLOW_NINJA_ENV=false m nothing; check out/soong.log
Change-Id: I2167eac52166b513318bc48feb71c9d0b80e5fd4
This commit is contained in:
Dan Willemsen 2020-01-02 20:08:10 -08:00
parent 9d4a90ef4b
commit 2607625f8b
2 changed files with 22 additions and 2 deletions
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20
Changes.md
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@ -1,5 +1,23 @@
# Build System Changes for Android.mk Writers
## Rules executed within limited environment
With `ALLOW_NINJA_ENV=false` (soon to be the default), ninja, and all the
rules/actions executed within it will only have access to a limited number of
environment variables. Ninja does not track when environment variables change
in order to trigger rebuilds, so changing behavior based on arbitrary variables
is not safe with incremental builds.
Kati and Soong can safely use environment variables, so the expectation is that
you'd embed any environment variables that you need to use within the command
line generated by those tools. See the [export section](#export_keyword) below
for examples.
For a temporary workaround, you can set `ALLOW_NINJA_ENV=true` in your
environment to restore the previous behavior, or set
`BUILD_BROKEN_NINJA_USES_ENV_VAR := <var> <var2> ...` in your `BoardConfig.mk`
to allow specific variables to be passed through until you've fixed the rules.
## LOCAL_C_INCLUDES outside the source/output trees are an error {#BUILD_BROKEN_OUTSIDE_INCLUDE_DIRS}
Include directories are expected to be within the source tree (or in the output
@ -31,7 +49,7 @@ Since this usually isn't a valid path, you can almost always just remove the
offending line.
# `BOARD_HAL_STATIC_LIBRARIES` and `LOCAL_HAL_STATIC_LIBRARIES` are obsolete {#BOARD_HAL_STATIC_LIBRARIES}
## `BOARD_HAL_STATIC_LIBRARIES` and `LOCAL_HAL_STATIC_LIBRARIES` are obsolete {#BOARD_HAL_STATIC_LIBRARIES}
Define proper HIDL / Stable AIDL HAL instead.

4
core/board_config.mk
View file

@ -98,7 +98,8 @@ _build_broken_var_list += \
BUILD_BROKEN_USES_$(m))
_board_true_false_vars := $(_build_broken_var_list)
_board_strip_readonly_list += $(_build_broken_var_list)
_board_strip_readonly_list += $(_build_broken_var_list) \
BUILD_BROKEN_NINJA_USES_ENV_VARS
# Conditional to building on linux, as dex2oat currently does not work on darwin.
ifeq ($(HOST_OS),linux)
@ -109,6 +110,7 @@ endif
# Broken build defaults
# ###############################################################
$(foreach v,$(_build_broken_var_list),$(eval $(v) :=))
BUILD_BROKEN_NINJA_USES_ENV_VARS :=
# Boards may be defined under $(SRC_TARGET_DIR)/board/$(TARGET_DEVICE)
# or under vendor/*/$(TARGET_DEVICE). Search in both places, but