Give NamedRegionTimer an Enabled flag, allowing all its clients to

[oota-llvm.git] / include / llvm / Support / Compiler.h

diff --git a/include/llvm/Support/Compiler.h b/include/llvm/Support/Compiler.h
index 8861a2095409d1de678c463da6ab47d45d5d5658..b2ce76d285ef76489f88247fe5bd1c6b68894a93 100644 (file)
--- a/include/llvm/Support/Compiler.h
+++ b/include/llvm/Support/Compiler.h
@@ -15,12 +15,21 @@
 #ifndef LLVM_SUPPORT_COMPILER_H
 #define LLVM_SUPPORT_COMPILER_H
 
-// The VISIBILITY_HIDDEN macro, used for marking classes with the GCC-specific
-// visibility("hidden") attribute.
+/// LLVM_LIBRARY_VISIBILITY - If a class marked with this attribute is linked
+/// into a shared library, then the class should be private to the library and
+/// not accessible from outside it.  Can also be used to mark variables and
+/// functions, making them private to any shared library they are linked into.
+
+/// LLVM_GLOBAL_VISIBILITY - If a class marked with this attribute is linked
+/// into a shared library, then the class will be accessible from outside the
+/// the library.  Can also be used to mark variables and functions, making them
+/// accessible from outside any shared library they are linked into.
 #if (__GNUC__ >= 4) && !defined(__MINGW32__) && !defined(__CYGWIN__)
-#define VISIBILITY_HIDDEN __attribute__ ((visibility("hidden")))
+#define LLVM_LIBRARY_VISIBILITY __attribute__ ((visibility("hidden")))
+#define LLVM_GLOBAL_VISIBILITY __attribute__ ((visibility("default")))
 #else
-#define VISIBILITY_HIDDEN
+#define LLVM_LIBRARY_VISIBILITY
+#define LLVM_GLOBAL_VISIBILITY
 #endif
 
 #if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
@@ -29,6 +38,12 @@
 #define ATTRIBUTE_USED
 #endif
 
+#if (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
+#define ATTRIBUTE_UNUSED __attribute__((__unused__))
+#else
+#define ATTRIBUTE_UNUSED
+#endif
+
 #ifdef __GNUC__ // aka 'ATTRIBUTE_CONST' but following LLVM Conventions.
 #define ATTRIBUTE_READNONE __attribute__((__const__))
 #else
@@ -72,7 +87,9 @@
 
 // ALWAYS_INLINE - On compilers where we have a directive to do so, mark a
 // method "always inline" because it is performance sensitive.
-#if (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+// GCC 3.4 supported this but is buggy in various cases and produces
+// unimplemented errors, just use it in GCC 4.0 and later.
+#if __GNUC__ > 3
 #define ALWAYS_INLINE __attribute__((always_inline))
 #else
 // TODO: No idea how to do this with MSVC.