| # Copyright 2012 The Android Open Source Project |
| # |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| { |
| # Get ready for the ugly... |
| # |
| # - We have to nest our variables dictionaries multiple levels deep, so that |
| # this and other gyp files can rely on previously-set variable values in |
| # their 'variables': { 'conditions': [] } clauses. |
| # |
| # Example 1: |
| # Within this file, we use the value of variable 'skia_os' to set the |
| # value of variable 'os_posix', so 'skia_os' must be defined within a |
| # "more inner" (enclosed) scope than 'os_posix'. |
| # |
| # Example 2: |
| # http://src.chromium.org/viewvc/chrome/trunk/src/third_party/libjpeg/libjpeg.gyp?revision=102306 , |
| # which we currently import into our build, uses the value of 'os_posix' |
| # within the 'conditions' list in its 'variables' dict. |
| # In order for that to work, it needs the value of 'os_posix' to have been |
| # set within a "more inner" (enclosed) scope than its own 'variables' dict. |
| # |
| # - On the other hand, key/value pairs of a given 'variable' dict are only |
| # inherited by: |
| # 1. directly enclosing 'variable' dicts, and |
| # 2. "sibling" 'variable' dicts (which, I guess, are combined into a single |
| # 'variable' dict during gyp processing) |
| # and NOT inherited by "uncles" (siblings of directly enclosing 'variable' |
| # dicts), so we have to re-define every variable at every enclosure level |
| # within our ridiculous matryoshka doll of 'variable' dicts. That's why |
| # we have variable definitions like this: 'skia_os%': '<(skia_os)', |
| # |
| # See http://src.chromium.org/viewvc/chrome/trunk/src/build/common.gypi?revision=127004 , |
| # which deals with these same constraints in a similar manner. |
| # |
| 'variables': { # level 1 |
| 'variables': { # level 2 |
| |
| # Variables needed by conditions list within the level-2 variables dict. |
| 'variables': { # level 3 |
| # We use 'skia_os' instead of 'OS' throughout our gyp files, to allow |
| # for cross-compilation (e.g. building for either MacOS or iOS on Mac). |
| # We set it automatically based on 'OS' (the host OS), but allow the |
| # user to override it via GYP_DEFINES if they like. |
| 'skia_os%': '<(OS)', |
| }, |
| |
| # Re-define all variables defined within the level-3 'variables' dict, |
| # so that siblings of the level-2 'variables' dict can see them. |
| 'skia_os%': '<(skia_os)', |
| |
| 'conditions': [ |
| ['skia_os == "win"', { |
| 'os_posix%': 0, |
| }, { |
| 'os_posix%': 1, |
| }], |
| ], |
| |
| 'skia_scalar%': 'float', |
| 'skia_mesa%': 0, |
| # Do not turn on 'skia_angle' - it is currently experimental |
| 'skia_angle%': 0, |
| 'skia_target_arch%': 'x86', |
| }, |
| |
| # Re-define all variables defined within the level-2 'variables' dict, |
| # so that siblings of the level-1 'variables' dict can see them. |
| 'skia_os%': '<(skia_os)', |
| 'os_posix%': '<(os_posix)', |
| 'skia_scalar%': '<(skia_scalar)', |
| 'skia_mesa%': '<(skia_mesa)', |
| 'skia_angle%': '<(skia_angle)', |
| 'skia_target_arch%': '<(skia_target_arch)', |
| }, |
| } |
| # Local Variables: |
| # tab-width:2 |
| # indent-tabs-mode:nil |
| # End: |
| # vim: set expandtab tabstop=2 shiftwidth=2: |