Re: emacs-25 307e76c 4/6: Add dynamic module module support

[Andreas Schwab <schwab@linux-m68k.org>]

Teodor Zlatanov <tzz@lifelogs.com> writes:

> +### Dynamic modules support
> +LIBMODULES=
> +HAVE_MODULES=no
> +MODULES_OBJ=
> +MODULES_SUFFIX=
> +if test "${with_modules}" != "no"; then
> +  if test "$opsys" = "gnu-linux"; then
> +    LIBMODULES="-ldl"
> +    MODULES_SUFFIX=".so"
> +    HAVE_MODULES=yes
> +  elif test "$opsys" = "cygwin"; then
> +    # XXX: not tested
> +    LIBMODULES="-lcygwin"
> +    MODULES_SUFFIX=".dll"
> +    HAVE_MODULES=yes
> +  elif test "$opsys" = "darwin"; then
> +    MODULES_SUFFIX=".so"
> +    HAVE_MODULES=yes
> +  elif test "$opsys" = "mingw32"; then
> +    MODULES_SUFFIX=".dll"
> +    HAVE_MODULES=yes
> +  else
> +    # BSD system have dlopen in the libc
> +    AC_CHECK_FUNC(dlopen, [MODULES_SUFFIX=".so"]
> +                          [HAVE_MODULES=yes], [])
> +  fi
> +
> +  if test "${HAVE_MODULES}" = no; then
> +    AC_MSG_ERROR([Dynamic modules are not supported on your system])
> +  fi
> +fi
> +
> +if test "${HAVE_MODULES}" = yes; then
> +   MODULES_OBJ="dynlib.o module.o"
> +   AC_DEFINE(HAVE_MODULES, 1, [Define to 1 if dynamic modules are enabled])
> +   AC_DEFINE_UNQUOTED(MODULES_SUFFIX, "$MODULES_SUFFIX", [System extension for dynamic libraries])
> +fi
> +AC_SUBST(MODULES_OBJ)
> +AC_SUBST(LIBMODULES)
> +AX_GCC_VAR_ATTRIBUTE(cleanup)
> +AC_CHECK_FUNCS(dladdr)

dladdr requires -ldl, but this check doesn't use LIBMODULES, which means
dladdr is never found here.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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