kc3-lang/automake

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    Commit

  • Hash : ca0ba5df
    Author : Stefano Lattarini
    Date : 2011-10-24T23:18:34 

    tests: fix spurious failures due to missing 'yywrap()' function

The AC_PROG_LEX Autoconf macro does not diagnose a failure to find
the "lex library" expected to provide a `yywrap' function (function
which is required to link most lex-generated programs).  On the
contrary, when all the link attempts (i.e., with `-ll' and `-lfl')
fail, configure declares that no lex library is needed, and simply
proceeds with the configuration process -- only for the build to
possibly fail later, at make time.

This behaviour is intended; the Autoconf manual reads:
 ``You are encouraged to use Flex in your sources, since it is
   both more pleasant to use than plain Lex and the C source it
   produces is portable.  In order to ensure portability, however,
   you must either provide a function `yywrap' or, if you don't use
   it (e.g., your scanner has no `#include'-like feature), simply
   include a `%noyywrap' statement in the scanner's source.''

This AC_PROG_LEX behaviour is causing some spurious failures of
the Automake testsuite in environments which lack a proper library
providing `yywrap' (this happens for example on Fedora-based
systems).   The proper workaround is to simply provide a fall-back
implementation of `yywrap' in our lexers.

* tests/cond35.test: Provide a dummy `yywrap' function.
* tests/lex3.test: Likewise.
* tests/silent-lex-generic.test: Likewise.
* tests/silent-lex-gcc.test: Likewise.
* tests/silent-many-generic.test: Likewise.
* tests/silent-many-gcc.test: Likewise.

Reported by Jim Meyering:
<http://lists.gnu.org/archive/html/automake-patches/2011-10/msg00092.html>

Cherry-picked (with some edits) from commits `v1.11-1085-gb5c3968'
(master) and `v1.11-871-geb147a1' (testsuite-work).

  • README

  • This is Automake, a Makefile generator.  It was inspired by the 4.4BSD
make and include files, but aims to be portable and to conform to the
GNU Coding Standards for Makefile variables and targets.

Automake is a Perl script.  The input files are called Makefile.am.
The output files are called Makefile.in; they are intended for use
with Autoconf.  Automake requires certain things to be done in your
configure.ac.

Variable assignment lines in Makefile.am pull in defaults from various
little *.am files.

To use Automake, replace your Makefile.in files with Makefile.am
files.  Read the documentation to see what to do.

This package also includes the "aclocal" program.  aclocal is a
program to generate an `aclocal.m4' based on the contents of
`configure.ac'.  It is useful as an extensible, maintainable mechanism
for augmenting autoconf.  It is intended that other package authors
will write m4 macros which can be automatically used by aclocal.

Automake has a test suite.  Use

	make check

to run it.  Capture its output in case of failing tests.  For more
information, please see the file tests/README.

Automake has a page on the web.  See:

	http://sources.redhat.com/automake/

The mailing list automake@gnu.org is for discussion of Automake and
its interactions with other configuration/portability tools like
Autoconf or Libtool.  Write to automake-request@gnu.org if you want to
join.

Mail suggestions and bug reports to bug-automake@gnu.org, patches
to automake-patches@gnu.org.

New releases are announced to autotools-announce@gnu.org.  Write to
autotools-announce-request@gnu.org if you want to receive them.

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