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docs: mention traditional awk limitation

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* doc/autoconf.texi (Limitations of Usual Tools) <awk>: Mention
that traditional awk lacks ENVIRON.  Add reference to awk manual.
(Particular Programs) <AC_PROG_AWK>: Add reference to awk section.
Reported by Ralf Wildenhues.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2010-09-07 15:51:47 -06:00
parent 4416ea8d25
commit 10adce65fe
2 changed files with 16 additions and 2 deletions
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8
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@ -1,3 +1,11 @@
2010-09-08 Eric Blake <eblake@redhat.com>
docs: mention traditional awk limitation
* doc/autoconf.texi (Limitations of Usual Tools) <awk>: Mention
that traditional awk lacks ENVIRON. Add reference to awk manual.
(Particular Programs) <AC_PROG_AWK>: Add reference to awk section.
Reported by Ralf Wildenhues.
2010-09-07 Eric Blake <eblake@redhat.com>
docs: mention bash vs. POSIXLY_CORRECT

10
doc/autoconf.texi
View File

@ -3915,6 +3915,9 @@ order, and set output variable @code{AWK} to the first one that is found.
It tries @code{gawk} first because that is reported to be the
best implementation. The result can be overridden by setting the
variable @code{AWK} or the cache variable @code{ac_cv_prog_AWK}.
Using this macro is sufficient to avoid the pitfalls of traditional
@command{awk} (@pxref{awk, , Limitations of Usual Tools}).
@end defmac
@defmac AC_PROG_GREP
@ -17732,6 +17735,7 @@ include some limitations you should be aware of.
@c This table includes things like `@command{expr} (|)', so we can't
@c use @table @command.
@table @asis
@anchor{awk}
@item @command{awk}
@c ----------------
@prindex @command{awk}
@ -17828,7 +17832,8 @@ Solaris @command{/bin/awk}, have many limitations and do not
conform to Posix. Nowadays @code{AC_PROG_AWK} (@pxref{Particular
Programs}) finds you an Awk that doesn't have these problems, but if
for some reason you prefer not to use @code{AC_PROG_AWK} you may need to
address them.
address them. For more detailed descriptions, see @ref{Language
History, , @command{awk} language history, gawk, GNU Awk User's Guide}.
Traditional Awk does not support multidimensional arrays or user-defined
functions.
@ -17845,7 +17850,8 @@ Traditional Awk does not support the expressions
@code{@var{a}?@var{b}:@var{c}}, @code{!@var{a}}, @code{@var{a}^@var{b}},
or @code{@var{a}^=@var{b}}.
Traditional Awk does not support the predefined @code{CONVFMT} variable.
Traditional Awk does not support the predefined @code{CONVFMT} or
@code{ENVIRON} variables.
Traditional Awk supports only the predefined functions @code{exp}, @code{index},
@code{int}, @code{length}, @code{log}, @code{split}, @code{sprintf},