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Bug 3993

Summary: altivec.h include in SDL_cpuinfo.h breaks compilation with -std=c++11
Product: SDL Reporter: bastien.bouclet
Component: *don't know*Assignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: PowerPC   
OS: Other   

Description bastien.bouclet 2017-12-05 18:27:39 UTC 
According to this GCC bug report, altivec.h requires building with the gnu extensions: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78263.

As an application developper, I don't want SDL to force me to enable the gnu extensions.

Reproduction steps:
$ cat test.cpp 
#include <SDL.h>

int main() {
	bool hello = false;
	return 0;
}

$ powerpc64-ps3-elf-g++ $(/usr/local/ps3dev/portlibs/ppu/bin/sdl2-config --cflags) -std=c++11 test.cpp 
test.cpp: In function 'int main()':
test.cpp:4:15: error: cannot convert 'bool' to '__vector(4) __bool int' in initialization
  bool hello = false;
               ^~~~~

I suggest removing the include of altivec.h from SDL_cpuinfo.h, leaving the decision to include it on PowerPC to the application.
Comment 1 Sam Lantinga 2017-12-13 00:27:06 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/58a69c196061

Including SDL_cpuinfo.h shouldn't cause a compiler error anymore, and if you really need to disable altivec you can define SDL_DISABLE_ALTIVEC_H before including SDL_cpuinfo.h