t/lex-header.sh

   1 #! /bin/sh
   2 # Copyright (C) 2011-2017 Free Software Foundation, Inc.
   3 #
   4 # This program is free software; you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation; either version 2, or (at your option)
   7 # any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  16
  17 # Automake lex support can work with flex '--header-file' option (see
  18 # bugs #8844 and #9933).
  19
  20 required='cc flex'
  21 . test-init.sh
  22
  23 # Here, we need to use the use flex option '--header-file', but some
  24 # older flex versions don't support is (see automake bug#11524 and
  25 # bug#12836).  Skip this test if such an old flex version is detected.
  26 $LEX --help | grep '.*--header-file' \
  27   || skip_ "flex doesn't support the '--header-file' option"
  28
  29 cat >> configure.ac << 'END'
  30 AC_PROG_CC
  31 AC_PROG_LEX
  32 AC_OUTPUT
  33 END
  34
  35 cat > Makefile.am << 'END'
  36 bin_PROGRAMS = foo
  37 foo_SOURCES = lexer.l main.c mylex.h
  38 foo_LFLAGS = --header-file=mylex.h
  39 BUILT_SOURCES = mylex.h
  40 # Recover from removal of header.
  41 mylex.h: foo-lexer.c
  42         test -f $@ || rm -f foo-lexer.c
  43         test -f $@ || $(MAKE) $(AM_MAKEFLAGS) foo-lexer.c
  44 END
  45
  46 cat > lexer.l << 'END'
  47 %option noyywrap
  48 %{
  49 #define YY_NO_UNISTD_H 1
  50 %}
  51 %%
  52 "GOOD"   return EOF;
  53 .
  54 %%
  55 END
  56
  57 cat > main.c <<'END'
  58 #define YY_NO_UNISTD_H 1
  59 #include "mylex.h"
  60 int main (void)
  61 {
  62   /* We don't use a 'while' loop here (like a real lexer would do)
  63      to avoid possible hangs. */
  64   if (yylex () == EOF)
  65     return 0;
  66   else
  67     return 1;
  68 }
  69 END
  70
  71 $ACLOCAL
  72 $AUTOCONF
  73 $AUTOMAKE -a
  74
  75 ./configure
  76
  77 # Program should build and run.
  78 $MAKE
  79 if ! cross_compiling; then
  80   echo GOOD | ./foo
  81   echo BAD | ./foo && exit 1
  82   : For shells with busted 'set -e'.
  83 fi
  84
  85 # Recovering from header removal.
  86 rm -f mylex.h
  87 $MAKE
  88 test -f mylex.h
  89
  90 # Sanity check on distribution.
  91 yl_distcheck
  92
  93 :