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gcc rs6000 target without glibc
- From: lothar <lothar dot felten at gmx dot net>
- To: bug-gcc at gcc dot gnu dot org, geoffk at geoffk dot org, dje at watson dot ibm dot com
- Date: Wed, 30 Mar 2005 22:22:26 +0200
- Subject: gcc rs6000 target without glibc
Hello,
Michael Meissner redirected me to this list, I contacted him because his
emailaddress was in rs6000/linux.h. I don't know who currently maintains
this file
I ran into trouble when trying to build a cross compiler for the RS6000
(target=ppc-linux).
In gcc-3.4.0/gcc/config/rs6000/linux.h there is in line 100:
[--code--]
#include <signal.h>
/* During the 2.5 kernel series the kernel ucontext was changed, but
the new layout is compatible with the old one, so we just define
and use the old one here for simplicity and compatibility. */
struct kernel_old_ucontext {
unsigned long uc_flags;
struct ucontext *uc_link;
stack_t uc_stack;
struct sigcontext_struct uc_mcontext;
sigset_t uc_sigmask;
};
[--code--]
since there are several signal.h files (glibc, linux-headers) I tried to
figure out wichone was needed, I tried to use asm/signal.h which, after
a few changes to rs6000/linux.h is ok. It shouldn't be any signal.h from
the glibc, because I configured with the option --without-headers.
size_t wasn't defined (no glibc), so I added this on too. Maybe this
should be defined somewhere else...
How I configured:
../gcc-3.4.0/configure --prefix=/home/cross/workspace/cross/out/
--target=ppc-linux --enable-languages=c --disable-nls --disable-shared
--disable-threads --without-headers --with-newlib
How my rs6000/linux.h looks now:
[--code--]
#ifdef IN_LIBGCC2
#include <linux/types.h> /*defines size_t for asm/signal.h*/
#include <asm/signal.h>
#include <asm/siginfo.h> /*defines struct siginfo */
#ifndef sigcontext_struct
/* Kernel headers before 2.1.1 define a struct sigcontext_struct, but
* we need sigcontext. */
# define sigcontext_struct sigcontext
#include <asm/sigcontext.h>
#endif
#include <asm/ucontext.h>
/* During the 2.5 kernel series the kernel ucontext was changed, but
the new layout is compatible with the old one, so we just define
and use the old one here for simplicity and compatibility. */
struct kernel_old_ucontext {
unsigned long uc_flags;
struct ucontext* uc_link;
stack_t uc_stack;
struct sigcontext_struct uc_mcontext;
sigset_t uc_sigmask;
};
[--code--]
Maybe someone can take a look at it, I don't know too much about gcc.
Lothar