kc3-lang/automake/tests/lexvpath.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/lexvpath.test

• #! /bin/sh
  # Copyright (C) 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/>.
  
  # This test checks that dependent files are updated before including
  # in the distribution.  `lexer.c' depends on `lexer.l'.  The latter is
  # updated so that `lexer.c' should be rebuild.  Then we are running
  # `make' and `make distdir' and check whether the version of `lexer.c'
  # to be distributed is up to date.
  
  # Please keep this in sync with sister test `yaccvapth.test'.
  
  required='gcc flex'
  . ./defs || Exit 1
  
  cat > lexoutroot.in << 'END'
  LEX_OUTPUT_ROOT='@LEX_OUTPUT_ROOT@'
  END
  
  cat >> configure.in << 'END'
  AC_CONFIG_FILES([lexoutroot])
  AC_PROG_CC
  AC_PROG_LEX
  AC_OUTPUT
  END
  
  cat > Makefile.am << 'END'
  bin_PROGRAMS = foo
  foo_SOURCES = lexer.l foo.c
  LDADD = $(LEXLIB)
  END
  
  # Original lexer, with a "foobar" comment
  cat > lexer.l << 'END'
  %%
  "END" return EOF;
  .
  %%
  /*foobar*/
  END
  
  cat > foo.c << 'END'
  int main () { return 0; }
  /* Avoid possible link errors. */
  int yywrap (void)
  {
    return 1;
  }
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE -a
  
  mkdir sub
  
  # We must run configure early, to find out whay $LEX_OUTPUT_ROOT is.
  cd sub
  ../configure
  . ./lexoutroot
  test -n "$LEX_OUTPUT_ROOT" # sanity check
  cd ..
  
  flex lexer.l
  mv "$LEX_OUTPUT_ROOT".c lexer.c
  
  cd sub
  
  # Ensure that lexer.l will be newer than lexer.c.
  $sleep
  
  # New lexer, with `fubar' comment.
  cat > ../lexer.l << 'END'
  %%
  "END" return EOF;
  .
  %%
  /*fubar*/
  END
  
  $MAKE
  $MAKE distdir
  $FGREP '/*fubar*/' $distdir/lexer.c
  
  #
  # Now check to make sure that `make dist' will rebuilt the parser.
  #
  
  # Ensure that lexer.l will be newer than lexer.c.
  $sleep
  
  # New lexer, with `maude' comment.
  cat > ../lexer.l << 'END'
  %%
  "END" return EOF;
  .
  %%
  /*maude*/
  END
  
  $MAKE distdir
  $FGREP '/*maude*/' $distdir/lexer.c
  
  :
  

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