Re: [PATCH 3/8] use weak symbols for the POSIX functions that will be used by C threads

[Rich Felker <dalias@libc.org>]

On Sat, Aug 30, 2014 at 08:46:49PM +0200, Jens Gustedt wrote:
> diff --git a/src/mman/mprotect.c b/src/mman/mprotect.c
> index f488486..535787b 100644
> --- a/src/mman/mprotect.c
> +++ b/src/mman/mprotect.c
> @@ -2,10 +2,12 @@
>  #include "libc.h"
>  #include "syscall.h"
>  
> -int mprotect(void *addr, size_t len, int prot)
> +int __mprotect(void *addr, size_t len, int prot)
>  {
>  	size_t start, end;
>  	start = (size_t)addr & -PAGE_SIZE;
>  	end = (size_t)((char *)addr + len + PAGE_SIZE-1) & -PAGE_SIZE;
>  	return syscall(SYS_mprotect, start, end-start, prot);
>  }
> +
> +weak_alias(__mprotect, mprotect);

I'll go ahead and eliminate this one from pthread_create.c like I had
mentioned so we can omit it. Doing so should be a size reduction too,
both locally (syscall is generally cheaper than function call) and for
static linking (since mprotect.o won't get pulled in).

Rich