AC_REQUIRE hell

[Akim Demaille]

Hi!

There must be something not going too well in the AC_REQUIRES of ltld. In the attached configure.ac, some macros are issued out of order, which results in, for instance, shrext_cmds being used before its definition:

$ grep -E 'shrext|If you need' configure
eval libltdl_cv_shlibext=$shrext_cmds

      shrext_cmds=".dll"
shrext_cmds=".so"
  shrext_cmds=".dll"
  shrext_cmds='`test .$module = .yes && echo .so || echo .dylib`'
    shrext_cmds='.so'
    shrext_cmds='.sl'
    shrext_cmds='.sl'
  shrext_cmds=".dll"

shrext_cmds \
shrext_cmds=$lt_shrext_cmds

# If you need to create a library, use libtool. <---- First line in the macro shrext_cmds='`$ECHO "$shrext_cmds" | $SED "$delay_single_quote_subst"`'

I have a simple work around: instead of

AC_DEFUN([URBI_LTDL], [my macro])

I have

AC_DEFUN([URBI_LTDL], [m4_fatal([should never be used])])
m4_define([URBI_LTDL], [my macro])



Cheers!

The first line is to have aclocal notice that the macro is defined in an m4/ file, and the second is to avoid that URBI_LTDL define an AC_REQUIRE boundary. I don't remember the details, but it seems suspicious to me that code using shrext_cmds is emitted before the contents of my macro. Either somewhere there are m4_define that should be AC_DEFUN to define the AC_REQUIRE barriers (an error in Libtool), or when a macro OUTER invokes a macro INNER which requires REQUIRED then REQUIRED is output before OUTER, which seems wrong to me (an error in Autoconf).

configure.ac
Description: Binary data

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