Disable cpuinfo in other build systems than Bazel unless they explcit…

…ly opt in by defining this RUY_HAVE_CPUINFO token. That requires first porting the cpuinfo BUILD.

PiperOrigin-RevId: 314794292

ruy/BUILD

@@ -332,12 +332,22 @@ cc_library(
                     # ruy_copts contains -Wundef, but cpuinfo's header warns with that.
                     "-Wno-undef",
                 ],
-            }),
+            }) + select({
+        # This select must match the similar select in `deps`.
+        # We intentionally define this token in the BUILD
+        # file so that ports to other build-systems do not
+        # use cpuinfo by default - they need to port the
+        # cpuinfo BUILD first, then can define this token.
+        ":ppc": [],
+        ":fuchsia": [],
+        "//conditions:default": ["-DRUY_HAVE_CPUINFO"],
+    }),
     deps = [
         ":platform",
         ":check_macros",
         ":cpu_cache_params",
     ] + select({
+        # This select must match the similar select in `copts`
         ":ppc": [],
         ":fuchsia": [],
         "//conditions:default": ["@cpuinfo//:cpuinfo_with_unstripped_include_path"],

ruy/cpuinfo.cc

@@ -8,9 +8,7 @@
 #include "ruy/cpu_cache_params.h"
 #include "ruy/platform.h"
 
-#define RUY_HAVE_CPUINFO (!(RUY_PLATFORM_PPC || RUY_PLATFORM_FUCHSIA))
-
-#if RUY_HAVE_CPUINFO
+#ifdef RUY_HAVE_CPUINFO
 #include "include/cpuinfo.h"
 #endif
 
@@ -24,7 +22,7 @@ void MakeDummyCacheParams(CpuCacheParams* result) {
 }
 }  // end namespace
 
-#if RUY_HAVE_CPUINFO
+#ifdef RUY_HAVE_CPUINFO
 
 CpuInfo::~CpuInfo() {
   if (init_status_ == InitStatus::kInitialized) {
@@ -115,7 +113,7 @@ bool CpuInfo::AvxVnni() {
   return EnsureInitialized() && cpuinfo_has_x86_avx512vnni();
 }
 
-#else  // not RUY_HAVE_CPUINFO
+#else  // not defined RUY_HAVE_CPUINFO
 
 CpuInfo::~CpuInfo() {}
 bool CpuInfo::EnsureInitialized() {