>>> "Akim" == Akim Demaille <akim@xxxxxxxxxxxxx> writes:
Hi!
Some time ago I sent this message for which I had no answer.
> I have this package at hand, say FooBar, which installs a prefixed
> form of config.h. Its own macros are, of course, named FB_*, which is
> m4_pattern_forbidden. But then I have to explicitly m4_pattern_allow
> all my FB_PACKAGE_VERSION etc.
> I suggest that the AC_DEFINE family explicitly allow its $1.
> Thanks.
I suggest that Automake provide the same feature for AM_CONDITIONAL:
| AC_DEFUN([AM_CONDITIONAL],
| [AC_PREREQ(2.52)dnl
| ifelse([$1], [TRUE], [AC_FATAL([$0: invalid condition: $1])],
| [$1], [FALSE], [AC_FATAL([$0: invalid condition: $1])])dnl
| AC_SUBST([$1_TRUE])
| AC_SUBST([$1_FALSE])
| if $2; then
| $1_TRUE=
| $1_FALSE='#'
| else
| $1_TRUE='#'
| $1_FALSE=
| fi
| AC_CONFIG_COMMANDS_PRE(
| [if test -z "${$1_TRUE}" && test -z "${$1_FALSE}"; then
| AC_MSG_ERROR([[conditional "$1" was never defined.
| Usually this means the macro was only invoked conditionally.]])
| fi])])
Sadly enough $1 does appear here... only in the (last) error message.
But still, if I AM_CONDITIONAL([FB_BAZ_USED], ...), I will be warned
by autoconf from terrible m4_pattern_* things.
Of course in the present case one would like to flag this precise
occurrence of $1. Maybe something like m4_patsubst([$1],
[^\(.\)\(.*\)$], [\1@&t@\2]) (untested) should be it. Or
m4_patsubst(quote($1)...) instead (usual dirty issues with M4 not
providing means to safely evaluate...).
Actually it might be useful to introduce m4_pattern_protect in
m4sugar, defined as above, as it is quite useful to disarm a specific
occurrence of a nasty token.
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