[PATCH v1 19/35] Assume __has_builtin(__builtin_unreachable)

[Alejandro Colomar]

We already assume that GCC is at least GCC 5,
and we also assume that Clang is at least Clang 4.

Clang added support for this builtin in Clang 2.7:

llvm.git bf20638966e2 (2009-09-21; "Implement __builtin_unreachable(), a GCC 4.5 extension.")

	$ git describe --contains bf20638966e2
	llvmorg-2.7.0~11211

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 soft-fp/soft-fp.h  | 4 ----
 timezone/private.h | 9 ---------
 2 files changed, 13 deletions(-)

diff --git a/soft-fp/soft-fp.h b/soft-fp/soft-fp.h
index 3b8d7e2265..a949962a63 100644
--- a/soft-fp/soft-fp.h
+++ b/soft-fp/soft-fp.h
@@ -49,11 +49,7 @@
 
 /* For unreachable default cases in switch statements over bitwise OR
    of FP_CLS_* values.  */
-#if (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5))
 # define _FP_UNREACHABLE	__builtin_unreachable ()
-#else
-# define _FP_UNREACHABLE	abort ()
-#endif
 
 #if ((__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6))	\
      || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
diff --git a/timezone/private.h b/timezone/private.h
index 4f430dba2c..838cfa76f1 100644
--- a/timezone/private.h
+++ b/timezone/private.h
@@ -904,16 +904,7 @@ time_t timeoff(struct tm *, long);
 # undef unreachable
 # define unreachable() abort()
 #elif !defined unreachable
-# ifdef __has_builtin
-#  if __has_builtin(__builtin_unreachable)
-#   define unreachable() __builtin_unreachable()
-#  endif
-# elif 4 < __GNUC__ + (5 <= __GNUC_MINOR__)
 #  define unreachable() __builtin_unreachable()
-# endif
-# ifndef unreachable
-#  define unreachable() ((void) 0)
-# endif
 #endif
 
 /*
-- 
2.51.0