kc3-lang/automake/tests/cond35.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/cond35.test

• #!/bin/sh
  # Copyright (C) 2004, 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/>.
  
  # Check rules output for parser defined conditionally.
  # Report from Roman Fietze.
  
  required='flex yacc gcc'
  . ./defs || Exit 1
  
  cat >>configure.in <<'EOF'
  AM_CONDITIONAL([CASE_A], test -z "$case_B")
  AC_PROG_CC
  AM_PROG_LEX
  AC_PROG_YACC
  AC_OUTPUT
  EOF
  
  cat >>Makefile.am <<'EOF'
  AM_YFLAGS               =       -d
  
  BUILT_SOURCES           =       tparse.h
  
  if CASE_A
  bin_PROGRAMS            =       ta
  ta_SOURCES              =       ta.c tparse.h tscan.l tparse.y
  ta_LDADD                =       $(LEXLIB)
  else
  bin_PROGRAMS            =       tb
  tb_SOURCES              =       tb.c tparse.h tscan.l tparse.y
  tb_LDADD                =       $(LEXLIB)
  endif
  
  
  test-ta:
  	test -f ta$(EXEEXT)
  test-tb:
  	test -f tb$(EXEEXT)
  EOF
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE --add-missing
  
  test `grep tparse.h: Makefile.in | wc -l` = 1
  
  cat > tscan.l << 'END'
  %%
  "END"   return EOF;
  %%
  /* Avoid possible link errors. */
  int yywrap (void)
  {
    return 1;
  }
  END
  
  cat > tparse.y << 'END'
  %{
  void yyerror (char *s) {}
  %}
  %token EOF
  %%
  foobar : 'f' 'o' 'o' 'b' 'a' 'r' EOF {};
  END
  
  cat >ta.c <<'END'
  int main()
  {
    return 0;
  }
  END
  
  cp ta.c tb.c
  
  ./configure
  $MAKE
  $MAKE test-ta
  
  ./configure case_B=yes
  $MAKE
  $MAKE test-tb
  

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