Handle older Linux without AT_HWCAP2

Summary: Some systems lack this constant. Reviewed By: Gownta Differential Revision: D63746373 fbshipit-source-id: 47e6e054d5fce39e53a05ce171fb242a21c14257
DenisYaroshevskiy · Oct 3, 2024 · 0794fb9 · 0794fb9
1 parent 4629171
commit 0794fb9
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/folly/system/AuxVector.h b/folly/system/AuxVector.h
@@ -56,7 +56,9 @@ class ElfHwCaps {
   FOLLY_ALWAYS_INLINE ElfHwCaps() {
 #if defined(__linux__) && !FOLLY_MOBILE
     hwcap_ = getauxval(AT_HWCAP);
+#if defined(AT_HWCAP2)
     hwcap2_ = getauxval(AT_HWCAP2);
+#endif
 #endif
   }