diff options
Diffstat (limited to 'lib/m4sugar/m4sugar.m4')
| -rw-r--r-- | lib/m4sugar/m4sugar.m4 | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/m4sugar/m4sugar.m4 b/lib/m4sugar/m4sugar.m4 index 6a191345..b42fc1a6 100644 --- a/lib/m4sugar/m4sugar.m4 +++ b/lib/m4sugar/m4sugar.m4 @@ -2412,6 +2412,27 @@ m4_define([m4_normalize], [m4_strip(m4_flatten([$1]))]) +# m4_validate_w(STRING) +# --------------------- +# Expands into m4_normalize(m4_expand([STRING])), but if that is not +# the same as just m4_normalize([STRING]), issue a warning. +# +# This is used in several Autoconf macros that take a +# whitespace-separated list of symbols as an argument. Ideally that +# list would not be expanded before use, but several packages used +# `dnl' to put comments inside those lists, so they must be expanded +# for compatibility's sake. +m4_define([m4_validate_w], +[_m4_validate_w(m4_normalize([$1]), m4_normalize(m4_expand([$1])))]) + +m4_define([_m4_validate_w], +[m4_if([$1], [$2], [], + [m4_warn([obsolete], [whitespace-separated list contains macros; +in a future version of Autoconf they will not be expanded]dnl +m4_if(m4_bregexp([$1], [\bdn[l]\b]), -1, [], [ +note: `dn@&t@l' is a macro]))])dnl +[$2]]) + # m4_join(SEP, ARG1, ARG2...) # --------------------------- |