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Commit 1f93043c authored by Andrew Boie's avatar Andrew Boie
Browse files

select.mk: Tune ccache options 



With these adjustments, cached object files can now be shared across
multiple Android trees on a single workstation:

* Compiler binary modification time no longer causes cache misses,
  as a hash of the compiler binary is taken rather than looking
  at the mtime and size
* Header file modification time no longer causes cache misses,
  the headers are now always hashed
* Macros such as __DATE__ and __TIME__ no longer cause cache misses
* All paths in preprocessed source (due to use of -g) are now relative

These options require ccache 3.1 or later to be used; ccache 2.4 will
ignore these.

Change-Id: I7839637e9dacf7240bd9b7bfaa6406b1db423560
Signed-off-by: default avatarAndrew Boie <andrew.p.boie@intel.com>
parent 20e713d1

core/combo/select.mk

+17 −0
Original line number Diff line number Diff line
@@ -60,6 +60,23 @@ $(combo_target)STATIC_LIB_SUFFIX := .a 
include $(BUILD_COMBOS)/$(combo_target)$(combo_os_arch).mk



ifneq ($(USE_CCACHE),)

  # The default check uses size and modification time, causing false misses

  # since the mtime depends when the repo was checked out

  export CCACHE_COMPILERCHECK := content



  # See man page, optimizations to get more cache hits

  # implies that __DATE__ and __TIME__ are not critical for functionality.

  # Ignore include file modification time since it will depend on when

  # the repo was checked out

  export CCACHE_SLOPPINESS := time_macros,include_file_mtime,file_macro



  # Turn all preprocessor absolute paths into relative paths.

  # Fixes absolute paths in preprocessed source due to use of -g.

  # We don't really use system headers much so the rootdir is

  # fine; ensures these paths are relative for all Android trees

  # on a workstation.

  export CCACHE_BASEDIR := /



  CCACHE_HOST_TAG := $(HOST_PREBUILT_TAG)

  # If we are cross-compiling Windows binaries on Linux

  # then use the linux ccache binary instead.