Make CROSSTOOL.default_target_cpu optional
It's deprecated, and not used, there's no reason for it to be required.
RELNOTES: None.
@@ -520,7 +520,7 @@ message CrosstoolRelease {
// Deprecated. Used to be the default CPU if not otherwise specified, but it's
// not used for that purpose (or anything else) anymore. Please also don't add
// new uses of this field.
- required string default_target_cpu = 3;
+ optional string default_target_cpu = 3;
// The default toolchain to use for each given cpu.
repeated DefaultCpuToolchain default_toolchain = 4;
