kc3-lang/automake/t/link_cond.sh

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• 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.
  

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• t/link_cond.sh

• #! /bin/sh
  # Copyright (C) 2012-2017 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/>.
  
  # Test that automatic determination of the linker works well with
  # conditional use of languages in a single program.
  # This currently doesn't truly work, but we have an easy workaround
  # at least, that is tested here.
  # See automake bug#11089.
  
  required='cc c++'
  . test-init.sh
  
  cat >> configure.ac << 'END'
  AC_PROG_CC
  AC_PROG_CXX
  AM_CONDITIONAL([HAVE_CXX], [test $have_cxx = yes])
  AC_OUTPUT
  END
  
  cat > Makefile.am << 'END'
  bin_PROGRAMS = foo
  if HAVE_CXX
  foo_SOURCES = more.c++
  else
  foo_SOURCES = less.c
  endif
  ## FIXME: ideally, this workaround shouldn't be needed.
  if HAVE_CXX
  foo_LINK = $(CXXLINK)
  else
  foo_LINK = $(LINK)
  endif
  END
  
  $ACLOCAL
  $AUTOMAKE
  $AUTOCONF
  
  rm -f *.c++
  cat > less.c <<'END'
  /* Valid C but deliberately invalid C++ */
  main ()
  {
    int new = 0;
    return new;
  }
  END
  
  ./configure have_cxx=no
  run_make CXX=false
  
  # Sanity check.
  rm -f foo foo.exe
  run_make CC=false && fatal_ '"make CC=false" succeeded unexpectedly'
  
  $MAKE distclean
  
  rm -f *.c
  cat > more.c++ <<'END'
  /* Valid C++ but deliberately invalid C */
  using namespace std;
  int main (void)
  {
    return 0;
  }
  END
  
  ./configure have_cxx=yes
  run_make CC=false
  
  # Sanity check.
  rm -f foo foo.exe
  run_make CXX=false && fatal_ '"make CXX=false" succeeded unexpectedly'
  
  :
  

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