I was wondering if you had problems compiling QEMU on Mac OS X recently. On my
system, the channel-socket.c file causes this error:
io/channel-socket.c: In function 'qio_channel_socket_writev':
io/channel-socket.c:497:18: error: variable-sized object may not be initialized
char control[CMSG_SPACE(sizeof(int) * SOCKET_MAX_FDS)] = { 0 };
As a test I made this simple program:
#include <sys/socket.h>
#include <stdio.h>
int main (int argc, char * const argv[]) {
printf("GCC version = %d.%d.%d\n", __GNUC__, __GNUC_MINOR__,
__GNUC_PATCHLEVEL__);
char control[CMSG_SPACE(sizeof(int) * 16)] = { 0 };
control[0] = 'a'; // just to eliminate a warning
return 0;
}
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?
