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MdePkg: avoid __builtin_unreachable() on GCC v4.4 

GCC v4.4 does not implement __builtin_unreachable(), so avoid using
it when building with this version or earlier.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-By: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Ard Biesheuvel 2016-07-14 14:10:14 +02:00
parent e78a2a49ee
commit 357cec385d
1 changed files with 2 additions and 1 deletions
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3
MdePkg/Include/Base.h
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@ -89,10 +89,11 @@ VERIFY_SIZE_OF (CHAR16, 2);
// warnings. // warnings.
// //
#ifndef UNREACHABLE #ifndef UNREACHABLE
#ifdef __GNUC__ #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 4)
/// ///
/// Signal compilers and analyzers that this call is not reachable. It is /// Signal compilers and analyzers that this call is not reachable. It is
/// up to the compiler to remove any code past that point. /// up to the compiler to remove any code past that point.
/// Not implemented by GCC 4.4 or earlier.
/// ///
#define UNREACHABLE() __builtin_unreachable () #define UNREACHABLE() __builtin_unreachable ()
#elif defined (__has_feature) #elif defined (__has_feature)