[PATCH] Rework -fno-omit-frame-pointer support on i386

[Nix]

On 9 Jan 2017, Adhemerval Zanella stated:

>  ifeq ($(subdir),misc)
>  sysdep_routines += ioperm iopl vm86
> -CFLAGS-epoll_pwait.o += $(uses-6-syscall-arguments)
> -CFLAGS-epoll_pwait.os += $(uses-6-syscall-arguments)
> -CFLAGS-mmap.o += $(uses-6-syscall-arguments)
> -CFLAGS-mmap.os += $(uses-6-syscall-arguments)
> -CFLAGS-mmap64.o += $(uses-6-syscall-arguments)
> -CFLAGS-mmap64.os += $(uses-6-syscall-arguments)
> -CFLAGS-pselect.o += $(uses-6-syscall-arguments)
> -CFLAGS-pselect.os += $(uses-6-syscall-arguments)
> -CFLAGS-rtld-mmap.os += $(uses-6-syscall-arguments)
> -endif

Nice!

> diff --git a/sysdeps/unix/sysv/linux/i386/configure.ac b/sysdeps/unix/sysv/linux/i386/configure.ac
> index 1a11da6..06ccb7b 100644
> --- a/sysdeps/unix/sysv/linux/i386/configure.ac
> +++ b/sysdeps/unix/sysv/linux/i386/configure.ac
> @@ -3,5 +3,24 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
>  
>  arch_minimum_kernel=2.6.32
>  
> +# Check if CFLAGS sets -fno-omit-frame-pointer
> +AC_CACHE_CHECK(for if compiler flags sets -fno-omit-frame-pointer,

Perhaps "for -fno-omit-frame-pointer in CFLAGS" might read better.

-- 
NULL && (void)