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Intuit if we should use anonymous structs

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Rather than making the user #define something explicitly, we can guess
based on the compiler type and C standard.
This commit is contained in:
Carsten Hartenfels
2019-11-24 16:00:06 -05:00
parent b9aa14d25e
commit d89c01b39f
1 changed files with 33 additions and 7 deletions
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40
include/cglm/types-struct.h
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@@ -10,9 +10,35 @@
#include "types.h"
/*
* Anonymous structs are available since C11, but we'd like to be compatible
* with C99 and C89 too. So let's figure out if we should be using them or not.
* It's simply a convenience feature, you can e.g. build the library with
* anonymous structs and your application without them and they'll still be
* compatible, cglm doesn't use the anonymous structs internally.
*/
#ifndef CGLM_USE_ANONYMOUS_STRUCT
/* If the user doesn't explicitly specify if they want anonymous structs or
* not, then we'll try to intuit an appropriate choice. */
# if defined(CGLM_NO_ANONYMOUS_STRUCT)
/* The user has defined CGLM_NO_ANONYMOUS_STRUCT. This used to be the
* only #define governing the use of anonymous structs, so for backward
* compatibility, we still honor that choice and disable them. */
# define CGLM_USE_ANONYMOUS_STRUCT 0
# elif __STDC_VERSION__ >= 20112L || defined(_MSVC_VER)
/* We're compiling for C11 or this is the MSVC compiler. In either
* case, anonymous structs are available, so use them. */
# define CGLM_USE_ANONYMOUS_STRUCT 1
# else
/* Otherwise, we're presumably building for C99 or C89 and can't rely
* on anonymous structs being available. Turn them off. */
# define CGLM_USE_ANONYMOUS_STRUCT 0
# endif
#endif
typedef union vec2s {
vec2 raw;
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float x;
float y;
@@ -22,7 +48,7 @@ typedef union vec2s {
typedef union vec3s {
vec3 raw;
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float x;
float y;
@@ -33,7 +59,7 @@ typedef union vec3s {
typedef union ivec3s {
ivec3 raw;
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
int x;
int y;
@@ -44,7 +70,7 @@ typedef union ivec3s {
typedef union CGLM_ALIGN_IF(16) vec4s {
vec4 raw;
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float x;
float y;
@@ -56,7 +82,7 @@ typedef union CGLM_ALIGN_IF(16) vec4s {
typedef union CGLM_ALIGN_IF(16) versors {
vec4 raw;
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float x;
float y;
@@ -74,7 +100,7 @@ typedef union CGLM_ALIGN_IF(16) versors {
typedef union mat3s {
mat3 raw;
vec3s col[3];
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float m00, m01, m02;
float m10, m11, m12;
@@ -86,7 +112,7 @@ typedef union mat3s {
typedef union CGLM_ALIGN_MAT mat4s {
mat4 raw;
vec4s col[4];
#ifndef CGLM_NO_ANONYMOUS_STRUCT
#if CGLM_USE_ANONYMOUS_STRUCT
struct {
float m00, m01, m02, m03;
float m10, m11, m12, m13;