kc3-lang/automake/t/lex-header.sh

• Show log

  Commit

• Hash : 3562e384
  Author :
  Date : 2017-09-16T13:03:36
  

  Prefer https: URLs
  
  In Gnulib, Emacs, etc. we are changing ftp: and http: URLs to use
  https:, to discourage man-in-the-middle attacks when downloading
  software. The attached patch propagates these changes upstream to
  Automake.  This patch does not affect files that Automake is
  downstream of, which I'll patch separately.
  
  Althouth the resources are not secret, plain HTTP is vulnerable to
  malicious routers that tamper with responses from GNU servers,
  and this sort of thing is all too common when people in some other
  countries browse US-based websites. See, for example:
  
  Aceto G, Botta A, Pescapé A, Awan MF, Ahmad T, Qaisar
  S. Analyzing internet censorship in Pakistan. RTSI
  2016. https://dx.doi.org/10.1109/RTSI.2016.7740626
  
  HTTPS is not a complete solution here, but it can be a significant
  help. The GNU project regularly serves up code to users, so we should
  take some care here.
  

Download

• t/lex-header.sh

• #! /bin/sh
  # Copyright (C) 2011-2017 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 <https://www.gnu.org/licenses/>.
  
  # Automake lex support can work with flex '--header-file' option (see
  # bugs #8844 and #9933).
  
  required='cc flex'
  . test-init.sh
  
  # Here, we need to use the use flex option '--header-file', but some
  # older flex versions don't support is (see automake bug#11524 and
  # bug#12836).  Skip this test if such an old flex version is detected.
  $LEX --help | grep '.*--header-file' \
    || skip_ "flex doesn't support the '--header-file' option"
  
  cat >> configure.ac << 'END'
  AC_PROG_CC
  AC_PROG_LEX
  AC_OUTPUT
  END
  
  cat > Makefile.am << 'END'
  bin_PROGRAMS = foo
  foo_SOURCES = lexer.l main.c mylex.h
  foo_LFLAGS = --header-file=mylex.h
  BUILT_SOURCES = mylex.h
  # Recover from removal of header.
  mylex.h: foo-lexer.c
  	test -f $@ || rm -f foo-lexer.c
  	test -f $@ || $(MAKE) $(AM_MAKEFLAGS) foo-lexer.c
  END
  
  cat > lexer.l << 'END'
  %option noyywrap
  %{
  #define YY_NO_UNISTD_H 1
  %}
  %%
  "GOOD"   return EOF;
  .
  %%
  END
  
  cat > main.c <<'END'
  #define YY_NO_UNISTD_H 1
  #include "mylex.h"
  int main (void)
  {
    /* 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;
  }
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE -a
  
  ./configure
  
  # Program should build and run.
  $MAKE
  if ! cross_compiling; then
    echo GOOD | ./foo
    echo BAD | ./foo && exit 1
    : For shells with busted 'set -e'.
  fi
  
  # Recovering from header removal.
  rm -f mylex.h
  $MAKE
  test -f mylex.h
  
  # Sanity check on distribution.
  yl_distcheck
  
  :
  

Download