kc3-lang/automake/tests/lex3.test

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• Hash : b5c39684
  Author :
  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.
  
  See also partially-overlapping commit `v1.11-871-geb147a1' (from
  the 'testsuite-work' branch), which was motivated by similar
  spurious failures experienced when cross-compiling.
  
  Reported by Jim Meyering:
  <http://lists.gnu.org/archive/html/automake-patches/2011-10/msg00092.html>
  
  * tests/cond35.test: Provide a dummy `yywrap' function.
  * tests/lex3.test: Likewise.
  * tests/lexvpath.test: Likewise.
  * tests/silent-lex-generic.test: Likewise.
  * tests/silent-lex-gcc.test: Likewise.
  

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• tests/lex3.test

• #! /bin/sh
  # Copyright (C) 1999, 2001, 2002, 2003, 2004, 2010, 2011 Free Software
  # Foundation, Inc.
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2, or (at your option)
  # any later version.
  #
  # This program is distributed in the hope that it will be useful,
  # but WITHOUT ANY WARRANTY; without even the implied warranty of
  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  # GNU General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  # Basic semantic checks on Lex support.
  # Test associated with PR 19.
  # From Matthew D. Langston.
  
  required='gcc flex GNUmake'
  . ./defs || Exit 1
  
  # Ignore user CFLAGS.
  CFLAGS=
  export CFLAGS
  
  cat >> configure.in << 'END'
  AC_PROG_CC
  AM_PROG_LEX
  AC_OUTPUT
  END
  
  cat > Makefile.am << 'END'
  LDADD             = @LEXLIB@
  noinst_PROGRAMS   = foo
  foo_SOURCES       = foo.l
  END
  
  cat > foo.l << 'END'
  %%
  "GOOD"   return EOF;
  .
  %%
  int
  main ()
  {
    /* We don't use a 'while' loop here (like a real lexer would do)
       to avoid possible hangs. */
    if (yylex () == EOF)
      return 0;
    else
      return 1;
  }
  
  /* Avoid possible link errors. */
  int yywrap (void)
  {
    return 1;
  }
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE -a
  
  ./configure
  
  # Program should build and run.
  $MAKE
  echo GOOD | ./foo
  echo BAD | ./foo && Exit 1
  
  # The generated file `foo.c' must be shipped.
  $MAKE distdir
  test -f $distdir/foo.c
  
  # Sanity check on distribution.
  $MAKE distcheck
  
  # While we are at it, make sure that foo.c is erased by
  # maintainer-clean, and not by distclean.
  test -f foo.c
  $MAKE distclean
  test -f foo.c
  ./configure # we must re-create `Makefile'
  $MAKE maintainer-clean
  test ! -f foo.c
  
  :
  

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