Re: [Qemu-devel] CMSG_SPACE() causing compile time error on Mac OS X

[Programmingkid]

On Jan 17, 2016, at 6:22 PM, Paolo Bonzini wrote:

> 
> 
> On 17/01/2016 23:23, Programmingkid wrote:
>> When compiling under Xcode, the program does compile and run. It prints "GCC 
>> version = 4.2.1".
>> 
>> When I try to compile it under gcc 4.2.1 using just the terminal, I see this 
>> error message:
>> main.cpp: In function ‘int main(int, char* const*)’:
>> main.cpp:6: error: size of array ‘control’ is not an integral 
>> constant-expression
>> 
>> Why there is a difference between XCode and the terminal I have no idea. 
>> 
>> When compiling it under gcc 4.9.2, it compiles and runs without problem. 
>> 
>> I have set the configure option for cc to gcc-4.9 with this "-cc=gcc-4.9". 
>> So the error message makes me believe that the wrong compiler is being used. 
>> 
>> This is the full configure command options I used:
>> ./configure --cxx=gcc-4.9 --cc=gcc-4.9 --objcc=gcc-4.9 --disable-gtk 
>> --disable-sdl --target-list=ppc-softmmu,i386-softmmu
>> 
>> Any insight as to what could be wrong? 
> 
> What's the definition of the CMSG_SPACE macro under OS X?
> 
> Paolo

#define CMSG_SPACE(l)           (__DARWIN_ALIGN32(sizeof(struct cmsghdr)) + 
__DARWIN_ALIGN32(l))

Hope this helps.