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Explain why the configure script tries to use -rdynamic.

This commit is contained in:
Kalle Olavi Niemitalo 2006-09-17 17:28:57 +03:00 committed by Kalle Olavi Niemitalo
parent 9c94a896b7
commit 9a695bfb0c

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@ -228,6 +228,32 @@ EL_CHECK_CODE([variadic macros], HAVE_VARIADIC_MACROS,
[a("foo");a("%s","bar");a("%s%s","baz","quux");])
dnl Check for -rdynamic
dnl
dnl gcc -rdynamic calls ld -export-dynamic, which adds all symbols of
dnl the executable to its dynamic symbol table. ELinks uses this for
dnl two purposes:
dnl
dnl 1. If ELinks detects a bug, it can try to display a backtrace by
dnl calling backtrace_symbols_fd() in the GNU libc. The glibc-2.3.6
dnl manual states users of GNU ld must pass -rdynamic to make the
dnl symbols available to the program.
dnl
dnl 2. It would eventually be nice to dynamically load shared
dnl libraries as plugins (bug 73). The plugins must be able to
dnl call ELinks functions. This can be implemented either by
dnl registering all callable functions in ELinks-specific data
dnl structures, or by letting the dynamic linker handle them.
dnl The latter way requires something equivalent to -rdynamic.
dnl
dnl Because backtraces are not needed for correct operation, and bug
dnl 73 is not yet being fixed, the configure script and makefiles
dnl should not complain to the user if they find that -rdynamic does
dnl not work. Besides, it was reported at elinks-users on 2006-09-12
dnl that gcc-3.4.2 with "ld: Software Generation Utilities - Solaris
dnl Link Editors: 5.8-1.284" on Sun Solaris 8 Sparc does not support
dnl -rdynamic but does something equivalent automatically. (This was
dnl tested with "nm -D elinks | grep redraw_from_window".)
dnl
dnl FIXME: This check doesn't work. Something to do with the compiler
dnl happily ignoring it and stderr not being checked for error messages.
AC_MSG_CHECKING([for -rdynamic])