REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1004

Being a compiler builtin, the type of __builtin_return_address is
already known to the compiler so no prototype is needed. Clang also
errors out when redeclaring certain builtins like this[1], though
currently only for ones with custom type checking. At the moment,
__builtin_return_address does not use custom type checking and so does
not trigger this error, however, the CHERI fork of LLVM, which will form
the basis of the toolchain for Arm's experimental Morello platform, does
use custom type checking for it, and so gives an error. Thus, simply
delete the unnecessary line.

[1] llvm/llvm-project@41af97137572ad6d4dafc872e7ecf6bbb08d4984

Cc: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Jessica Clarke <jrtc27@jrtc27.com>
---
Changes in v2:
 * Shortened [1] reference to fit column limit. The bug report has the
   full URL already, and this will still link correctly on GitHub.

 MdePkg/Include/Base.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h
index 85a091b9d5..8e4271f6ea 100644
--- a/MdePkg/Include/Base.h
+++ b/MdePkg/Include/Base.h
@@ -1273,7 +1273,6 @@ typedef UINTN RETURN_STATUS;
   **/
   #define RETURN_ADDRESS(L)     ((L == 0) ? _ReturnAddress() : (VOID *) 0)
 #elif defined (__GNUC__) || defined (__clang__)
-  void * __builtin_return_address (unsigned int level);
   /**
     Get the return address of the calling function.
 
--
2.20.1


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Reviewed-by: Liming Gao <liming.gao@intel.com>

-----Original Message-----
From: Jessica Clarke <jrtc27@jrtc27.com> 
Sent: 2020年7月27日 9:59
To: devel@edk2.groups.io
Cc: Jessica Clarke <jrtc27@jrtc27.com>; Gao, Liming <liming.gao@intel.com>; leif@nuviainc.com; Kinney, Michael D <michael.d.kinney@intel.com>
Subject: [PATCH v2] MdePkg Base.h: Delete prototype for __builtin_return_address

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1004

Being a compiler builtin, the type of __builtin_return_address is already known to the compiler so no prototype is needed. Clang also errors out when redeclaring certain builtins like this[1], though currently only for ones with custom type checking. At the moment, __builtin_return_address does not use custom type checking and so does not trigger this error, however, the CHERI fork of LLVM, which will form the basis of the toolchain for Arm's experimental Morello platform, does use custom type checking for it, and so gives an error. Thus, simply delete the unnecessary line.

[1] llvm/llvm-project@41af97137572ad6d4dafc872e7ecf6bbb08d4984

Cc: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Jessica Clarke <jrtc27@jrtc27.com>
---
Changes in v2:
 * Shortened [1] reference to fit column limit. The bug report has the
   full URL already, and this will still link correctly on GitHub.

 MdePkg/Include/Base.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h index 85a091b9d5..8e4271f6ea 100644
--- a/MdePkg/Include/Base.h
+++ b/MdePkg/Include/Base.h
@@ -1273,7 +1273,6 @@ typedef UINTN RETURN_STATUS;
   **/
   #define RETURN_ADDRESS(L)     ((L == 0) ? _ReturnAddress() : (VOID *) 0)
 #elif defined (__GNUC__) || defined (__clang__)
-  void * __builtin_return_address (unsigned int level);
   /**
     Get the return address of the calling function.
 
--
2.20.1


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