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raymath.h: Use C99 inline semantics

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RAYMATH_EXTERN_INLINE was renamed to RAYMATH_HEADER_ONLY, which user code
may define if they want to use it as header-only library. If multiple
files in the same project define RAYMATH_HEADER_ONLY, they might each
have duplicate out-of-line definitions of the same functions.

By default, raymath.h exposes inline definitions, which instructs the
compiler _not_ to generate out-of-line definitons, if out-of-line
definitions are required, those of the file defined with
RAYLIB_IMPLEMENTATION are used instead. There may be only one such file.

In C++ mode, the compiler will select only one out-of-line definition
automatically, so no need to define a RAYLIB_IMPLEMENTATION.

Unfortunately, we have to remove raymath function declaration from
raylib.h as those declarations would lead to duplicate out-of-line
definitions which would yield linker errors. This problem didn't
exist with GNU89 or C++, because there multiple defintions are ok,
but in C99 they aren't.
This commit is contained in:
Ahmad Fatoum 2018-02-22 02:05:00 +01:00
parent ed6962edd3
commit f52d2de582
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GPG key ID: C3EAC3DE9321D59B
4 changed files with 30 additions and 141 deletions
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7
src/core.c
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@ -98,13 +98,12 @@
#define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext.
#endif
#define RAYMATH_IMPLEMENTATION // Define external out-of-line implementation of raymath here
#include "raymath.h" // Required for: Vector3 and Matrix functions
#include "rlgl.h" // raylib OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
#include "utils.h" // Required for: fopen() Android mapping
#define RAYMATH_IMPLEMENTATION // Use raymath as a header-only library (includes implementation)
#define RAYMATH_EXTERN_INLINE // Compile raymath functions as static inline (remember, it's a compiler hint)
#include "raymath.h" // Required for: Vector3 and Matrix functions
#if defined(SUPPORT_GESTURES_SYSTEM)
#define GESTURES_IMPLEMENTATION
#include "gestures.h" // Gestures detection functionality