Fix ARM delay function (#20901)

2021-02-06 05:43:51 +01:00
parent 6054052248
commit 77966135e8
11 changed files with 279 additions and 94 deletions
--- a/Marlin/src/core/macros.h
+++ b/Marlin/src/core/macros.h
@ -61,6 +61,8 @@
 #define _O2          __attribute__((optimize("O2")))
 #define _O3          __attribute__((optimize("O3")))

+#define IS_CONSTEXPR(...) __builtin_constant_p(__VA_ARGS__) // Only valid solution with C++14. Should use std::is_constant_evaluated() in C++20 instead
+
 #ifndef UNUSED
  #define UNUSED(x) ((void)(x))
 #endif