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Add fallback implementation for constexpr and alignof

This commit is contained in:
Behdad Esfahbod 2018-07-10 12:58:13 +02:00
parent 7cb47d0f3f
commit bca83618cd
1 changed files with 18 additions and 0 deletions
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18
src/hb-private.hh
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@ -84,6 +84,10 @@ extern "C" void hb_free_impl(void *ptr);
#define nullptr NULL #define nullptr NULL
#endif #endif
#ifndef constexpr
#define constexpr const
#endif
// Static assertions // Static assertions
#ifndef static_assert #ifndef static_assert
#define static_assert(e, msg) \ #define static_assert(e, msg) \
@ -98,6 +102,20 @@ extern "C" void hb_free_impl(void *ptr);
#define thread_local #define thread_local
#endif #endif
#ifndef alignof
#define alignof(x) _hb_alignof<x>::value;
template <typename T>
struct _hb_alignof
{
struct s
{
char c;
T t;
};
static constexpr unsigned int value = offsetof (s, t);
};
#endif // alignof
#endif // __cplusplus < 201103L #endif // __cplusplus < 201103L
#if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__) #if (defined(__GNUC__) || defined(__clang__)) && defined(__OPTIMIZE__)