Re: [PATCH] Use linker script to remove unnecessary sections

[Christian Franke <Christian.Franke@t-online.de>]

Bean wrote:
> ...
> diff -u -p -r1.7 aclocal.m4
> --- aclocal.m4	25 Nov 2007 02:01:30 -0000	1.7
> +++ aclocal.m4	14 Dec 2007 11:51:14 -0000
> @@ -57,7 +57,7 @@ else
>  fi
>  grub_cv_prog_objcopy_absolute=yes
>  for link_addr in 2000 8000 7C00; do
> -  if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} ${LDFLAGS} -nostdlib -Wl,-N
> -Wl,-Ttext -Wl,$link_addr conftest.o -o conftest.exec]); then :
> +  if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib -Wl,-N -Wl,-T
> "-Wl,${srcdir}/ldscript" -Wl,-Ttext -Wl,$link_addr conftest.o -o
> conftest.exec]); then :
>   

Selecting the builtin "-N" script first has no effect if a custom script 
is specified later. Therefore, "-Wl,-N" is IMO no longer necessary.


Pavel Roskin wrote:
> ...
> We may want to use architecture specific ld scripts, but that can be 
> corrected in further patches.

See "[PATCH] Build on Cygwin" for a working example on how to select a 
platform specific linker script in configure.ac. This can be easily 
extended, e.g. test more specific scripts first:

  for f in \
    ${target_cpu}-${platform}-${target_os} \
    ${target_cpu}-${platform} \
    ${target_cpu}; do
    if test -f "${srcdir}/conf/$f-img-ld.sc"; then ...


Christian