Hi Sam,
On 10 Jun 2010, at 01:51, Sam Steingold wrote:
> how can I get the value of export_dynamic_flag_spec substituted by configure?
> I have this in my configure.in:
>
> AC_LIBTOOL_DLOPEN_SELF dnl do I even need this?!
> AC_PROG_LIBTOOL
> EXPORT_DYNAMIC_FLAG_SPEC=$export_dynamic_flag_spec
> AC_SUBST(EXPORT_DYNAMIC_FLAG_SPEC)dnl
>
> and this in my foo.sh.in file:
>
> EXPORT_DYNAMIC_FLAG_SPEC='@EXPORT_DYNAMIC_FLAG_SPEC@'
>
> alas, instead of
>
> EXPORT_DYNAMIC_FLAG_SPEC='-Wl,--export-dynamic'
>
> foo.sh contains this:
>
> EXPORT_DYNAMIC_FLAG_SPEC='${wl}--export-dynamic'
>
> which is obviously wrong.
No, it's quite deliberate. That way when we link with the compiler driver
we can say:
wl=-Wl,
eval $CC .... $export_dynamic_flag_spec ...
and when we want to link by calling the linker directly we can say:
wl=
eval $LD ... $export_dynamic_flag_spec ...
> So, how do I get the full correct value of export_dynamic_flag_spec?
Choose or extract an appropriate value for $wl from libtool, something along
the lines of:
eval `libtool --tag=CC --config|grep '^wl='`
Generally when a libtool variable name ends with '_spec', that means it
relies on being evaluated with an appropriate environment before use.
Cheers,
--
Gary V. Vaughan (g...@gnu.org)
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