[PATCH] D14337: Define a portable macro for specifying packed struct

[David Li via llvm-commits]

davidxl created this revision.
davidxl added a reviewer: rnk.
davidxl added a subscriber: llvm-commits.

With the defined the macro, to specify a packed struct in LLVM, one should do

LLVM_PACKED (struct A {
                                             ...
                                          };)

http://reviews.llvm.org/D14337

Files:
  include/llvm/Support/Compiler.h

Index: include/llvm/Support/Compiler.h
===================================================================
--- include/llvm/Support/Compiler.h
+++ include/llvm/Support/Compiler.h
@@ -293,6 +293,15 @@
 # define LLVM_ALIGNAS(x) alignas(x)
 #endif
 
+/// \macro LLVM_PACKED
+/// \brief Used to specify a packed structure.
+///
+#ifdef _MSC_VER
+# define LLVM_PACKED(d) __pragma(pack(push, 1)) d __pragma(pack(pop))
+#else
+# define LLVM_PACKED(d) d __attribute__((packed))
+#endif
+
 /// \macro LLVM_PTR_SIZE
 /// \brief A constant integer equivalent to the value of sizeof(void*).
 /// Generally used in combination with LLVM_ALIGNAS or when doing computation in


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