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Try detecting clang::fallthrough using __has_cpp_attribute

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and use it to silence one of the warnings in #96.
This commit is contained in:
Victor Zverovich 2015-02-07 06:51:47 -08:00
parent 83f5085551
commit d7fea1ba0c
1 changed files with 13 additions and 1 deletions
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14
format.h
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@ -76,6 +76,12 @@
# define FMT_HAS_BUILTIN(x) 0 # define FMT_HAS_BUILTIN(x) 0
#endif #endif
#ifdef __has_cpp_attribute
# define FMT_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
#else
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#ifndef FMT_USE_VARIADIC_TEMPLATES #ifndef FMT_USE_VARIADIC_TEMPLATES
// Variadic templates are available in GCC since version 4.4 // Variadic templates are available in GCC since version 4.4
// (http://gcc.gnu.org/projects/cxx0x.html) and in Visual C++ // (http://gcc.gnu.org/projects/cxx0x.html) and in Visual C++
@ -109,6 +115,12 @@
# define FMT_NOEXCEPT(expr) # define FMT_NOEXCEPT(expr)
#endif #endif
#if FMT_HAS_CPP_ATTRIBUTE(clang::fallthrough)
# define FMT_FALLTHROUGH [[clang::fallthrough]]
#else
# define FMT_FALLTHROUGH
#endif
// A macro to disallow the copy constructor and operator= functions // A macro to disallow the copy constructor and operator= functions
// This should be used in the private: declarations for a class // This should be used in the private: declarations for a class
#define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \ #define FMT_DISALLOW_COPY_AND_ASSIGN(TypeName) \
@ -864,7 +876,7 @@ class ArgVisitor {
switch (arg.type) { switch (arg.type) {
default: default:
assert(false); assert(false);
// Fall through. FMT_FALLTHROUGH;
case Arg::INT: case Arg::INT:
return FMT_DISPATCH(visit_int(arg.int_value)); return FMT_DISPATCH(visit_int(arg.int_value));
case Arg::UINT: case Arg::UINT: