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Add error if raylib.h is included in a C++98 program (#3093)

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The color macros don't work properly in C++98, because they require
aggregate initialzation, which is a C++11 feature. So, explicitly state
how to fix this issue, instead of letting the compiler give a more vague
error message like:

main.cpp:8:23: error: expected '(' for function-style cast or type construction
      ClearBackground(BLACK);
                      ^~~~~
/opt/homebrew/Cellar/raylib/4.5.0/include/raylib.h:179:35: note: expanded from macro 'BLACK'
 #define BLACK      CLITERAL(Color){ 0, 0, 0, 255 }         // Black

NOTE: Don't use this check with MSVC because by default, it reports
199711L  regardless of any C++ version passed on command line
Only passing `/Zc:__cplusplus` will make MSVC set this correctly

see: https://learn.microsoft.com/en-us/cpp/build/reference/zc-cplusplus
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Peter0x44 2023-06-01 08:47:52 +01:00 • committed by GitHub
parent e497603678
commit 2dec56e7b7
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8
src/raylib.h
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@ -133,12 +133,20 @@
// NOTE: MSVC C++ compiler does not support compound literals (C99 feature) // NOTE: MSVC C++ compiler does not support compound literals (C99 feature)
// Plain structures in C++ (without constructors) can be initialized with { } // Plain structures in C++ (without constructors) can be initialized with { }
// This is called aggregate initialization (C++11 feature)
#if defined(__cplusplus) #if defined(__cplusplus)
#define CLITERAL(type) type #define CLITERAL(type) type
#else #else
#define CLITERAL(type) (type) #define CLITERAL(type) (type)
#endif #endif
// Some compilers (mostly macos clang) default to C++98,
// where aggregate initialization can't be used
// So, give a more clear error stating how to fix this
#if !defined(_MSC_VER) && (defined(__cplusplus) && __cplusplus < 201103L)
#error "C++11 or later is required. Add -std=c++11"
#endif
// NOTE: We set some defines with some data types declared by raylib // NOTE: We set some defines with some data types declared by raylib
// Other modules (raymath, rlgl) also require some of those types, so, // Other modules (raymath, rlgl) also require some of those types, so,
// to be able to use those other modules as standalone (not depending on raylib) // to be able to use those other modules as standalone (not depending on raylib)