diff options
Diffstat (limited to 'compiler_wrapper/ccache_flag.go')
-rw-r--r-- | compiler_wrapper/ccache_flag.go | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/compiler_wrapper/ccache_flag.go b/compiler_wrapper/ccache_flag.go new file mode 100644 index 00000000..13ee234d --- /dev/null +++ b/compiler_wrapper/ccache_flag.go @@ -0,0 +1,60 @@ +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 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") + } +} |