| // Copyright 2019 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| package main |
| |
| func processCCacheFlag(sysroot string, builder *commandBuilder) { |
| // We should be able to share the objects across compilers as |
| // the pre-processed output will differ. This allows boards |
| // that share compiler flags (like x86 boards) to share caches. |
| const ccacheDir = "/var/cache/distfiles/ccache" |
| |
| useCCache := true |
| builder.transformArgs(func(arg builderArg) string { |
| if arg.value == "-noccache" { |
| useCCache = false |
| return "" |
| } |
| return arg.value |
| }) |
| |
| if builder.cfg.useCCache && useCCache { |
| // We need to get ccache to make relative paths from within the |
| // sysroot. This lets us share cached files across boards (if |
| // all other things are equal of course like CFLAGS) as well as |
| // across versions. A quick test is something like: |
| // $ export CFLAGS='-O2 -g -pipe' CXXFLAGS='-O2 -g -pipe' |
| // $ BOARD=x86-alex |
| // $ cros_workon-$BOARD stop cros-disks |
| // $ emerge-$BOARD cros-disks |
| // $ cros_workon-$BOARD start cros-disks |
| // $ emerge-$BOARD cros-disks |
| // $ BOARD=amd64-generic |
| // $ cros_workon-$BOARD stop cros-disks |
| // $ emerge-$BOARD cros-disks |
| // $ cros_workon-$BOARD start cros-disks |
| // $ emerge-$BOARD cros-disks |
| // All of those will get cache hits (ignoring the first one |
| // which will seed the cache) due to this setting. |
| builder.updateEnv("CCACHE_BASEDIR=" + sysroot) |
| if builder.env.getenv("CCACHE_DISABLE") != "" { |
| // Portage likes to set this for us when it has FEATURES=-ccache. |
| // The other vars we need to setup manually because of tools like |
| // scons that scrubs the env before we get executed. |
| builder.updateEnv("CCACHE_DISABLE=") |
| } |
| // If RESTRICT=sandbox is enabled, then sandbox won't be setup, |
| // and the env vars won't be available for appending. |
| if sandboxRewrite := builder.env.getenv("SANDBOX_WRITE"); sandboxRewrite != "" { |
| builder.updateEnv("SANDBOX_WRITE=" + sandboxRewrite + ":" + ccacheDir) |
| } |
| |
| // Make sure we keep the cached files group writable. |
| builder.updateEnv("CCACHE_DIR="+ccacheDir, "CCACHE_UMASK=002") |
| |
| // ccache may generate false positive warnings. |
| // Workaround bug https://crbug.com/649740 |
| if builder.target.compilerType == clangType { |
| builder.updateEnv("CCACHE_CPP2=yes") |
| } |
| |
| builder.wrapPath("/usr/bin/ccache") |
| } |
| } |