Re: [PATCH] Use common linker script for all i386-pc systems

[Christian Franke]

Vladimir 'phcoder' Serbinenko wrote:
> Hello.
>
> On Sun, May 17, 2009 at 7:33 AM, Pavel Roskin <...> wrote:
>   
> > This allows us to remove checks for the linker symbols for the beginning
> > and the end of the .bss section.  Instead, we use the names from the
> > linker script.  Another benefit is a better unification of the build
> > system.
> >
> >     
>
>   

Good idea. Patch works on Cygwin. Does it work on Linux, FreeBSD, ... ?

The variable TARGET_IMG_LDFLAGS_AC can also be removed, see attached patch.

The linker script is actually identical to the script from my first 
Cygwin patch. It can be further simplified if desired.

> > @@ -0,0 +1,53 @@
> > +/* Linker script to create grub .img files on Cygwin.  */
> >     
> This comment is out of sync
>   
> >  VARIABLE(grub_end_addr)
> > -       .long   END_SYMBOL
> > +       .long   __bss_end__
> >     
> This variable isn't used at all. In my Apple's CC patch I just remove it
>
>   

'grub_start_addr' and '.globl start, _start' are also not used.


--
Christian Franke

diff --git a/configure.ac b/configure.ac
index a048828..e799a79 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,15 +212,13 @@ AC_MSG_CHECKING([for option to link raw image])
 if test -f "${srcdir}/conf/${target_cpu}-${platform}.lds"; then
   TARGET_IMG_LDSCRIPT='$(top_srcdir)'"/conf/${target_cpu}-${platform}.lds"
   TARGET_IMG_LDFLAGS="-Wl,-T${TARGET_IMG_LDSCRIPT}"
-  TARGET_IMG_LDFLAGS_AC="-Wl,-T${srcdir}/conf/${target_cpu}-${platform}.lds"
 else
   TARGET_IMG_LDSCRIPT=
   TARGET_IMG_LDFLAGS='-Wl,-N'
-  TARGET_IMG_LDFLAGS_AC='-Wl,-N'
 fi
 AC_SUBST(TARGET_IMG_LDSCRIPT)
 AC_SUBST(TARGET_IMG_LDFLAGS)
-AC_MSG_RESULT([$TARGET_IMG_LDFLAGS_AC])
+AC_MSG_RESULT([$TARGET_IMG_LDFLAGS])
 
 # For platforms where ELF is not the default link format.
 AC_MSG_CHECKING([for command to convert module to ELF format])
@@ -379,11 +377,6 @@ grub_PROG_OBJCOPY_ABSOLUTE
 grub_PROG_LD_BUILD_ID_NONE
 grub_ASM_USCORE
 if test "x$target_cpu" = xi386; then
-  if test ! -z "$TARGET_IMG_LDSCRIPT"; then
-    # Check symbols provided by linker script.
-    CFLAGS="$TARGET_CFLAGS -nostdlib $TARGET_IMG_LDFLAGS_AC 
-Wl,-Ttext,8000,--defsym,___main=0x8100"
-  fi
-  CFLAGS="$TARGET_CFLAGS"
   grub_I386_ASM_PREFIX_REQUIREMENT
   grub_I386_ASM_ADDR32
   grub_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK