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// 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 _, present := builder.env.getenv("CCACHE_DISABLE"); present {
// 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, present := builder.env.getenv("SANDBOX_WRITE"); present {
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")
}
}
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