kc3-lang/automake/t/am-prog-cc-c-o.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/am-prog-cc-c-o.sh

• #! /bin/sh
  # Copyright (C) 2013-2017 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/>.
  
  # Check that uses of the obsolescent AM_PROG_CC_C_O macro doesn't
  # cause spurious warnings or errors.  Suggested by Eric Blake.
  
  # We need gcc for for two reasons:
  #  1. to ensure our C compiler grasps "-c -o" together.
  #  2. to be able to later fake a dumb compiler not grasping that
  #     (done with 'cc-no-c-o' script below, which required gcc).
  required=gcc
  . test-init.sh
  
  echo bin_PROGRAMS = foo > Makefile.am
  echo 'int main (void) { return 0; }' > foo.c
  
  cp configure.ac configure.bak
  
  cat > acinclude.m4 <<'END'
  AC_DEFUN([AM_TWEAKED_OUTPUT], [
  # For debugging.
  printf "CC = '%s'\\n" "$CC"
  # Make sure that $CC can be used after AM_PROG_CC_C_O.
  $CC --version || exit 1
  $CC -v || exit 1
  # $CC rewrite should only take place on time.
  case " $CC " in
    *" compile"*" compile"*) AC_MSG_ERROR([CC rewritten twice]);;
  esac
  AC_OUTPUT
  ])
  END
  
  # ---
  
  cat configure.bak - > configure.ac << 'END'
  dnl It's OK to call AM_PROG_CC_C_O after AC_PROG_CC.
  AC_PROG_CC
  AM_PROG_CC_C_O
  AM_TWEAKED_OUTPUT
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE --add-missing
  
  ./configure >stdout || { cat stdout; exit 1; }
  cat stdout
  if test "$AM_TESTSUITE_SIMULATING_NO_CC_C_O" != no; then
    $EGREP 'understands? -c and -o together.* no$' stdout
  else
    $EGREP 'understands? -c and -o together.* yes$' stdout
  fi
  
  # No repeated checks please.
  test $(grep -c ".*-c['\" ].*-o['\" ]" stdout) -eq 1
  
  $MAKE
  $MAKE maintainer-clean
  rm -rf autom4te*.cache
  
  # ---
  
  cat configure.bak - > configure.ac << 'END'
  dnl It's also OK to call AM_PROG_CC_C_O *before* AC_PROG_CC.
  AM_PROG_CC_C_O
  AC_PROG_CC
  AM_TWEAKED_OUTPUT
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE --add-missing
  
  ./configure >stdout || { cat stdout; exit 1; }
  cat stdout
  if test "$AM_TESTSUITE_SIMULATING_NO_CC_C_O" != no; then
    $EGREP 'understands? -c and -o together.* no$' stdout
  else
    $EGREP 'understands? -c and -o together.* yes$' stdout
  fi
  
  # Repeated checks are OK in this case, but should be cached.
  test $(grep ".*-c['\" ].*-o['\" ]" stdout \
          | $FGREP -v ' (cached) ' | wc -l) -eq 1
  
  $MAKE
  $MAKE maintainer-clean
  rm -rf autom4te*.cache
  
  # ---
  
  cat configure.bak - > configure.ac << 'END'
  dnl It's also OK to call AM_PROG_CC_C_O *without* AC_PROG_CC.
  AM_PROG_CC_C_O
  AM_TWEAKED_OUTPUT
  END
  
  $ACLOCAL
  $AUTOCONF
  $AUTOMAKE --add-missing
  
  # Make sure the compiler doesn't understand '-c -o'
  CC=$am_testaux_builddir/cc-no-c-o; export CC
  
  ./configure >stdout || { cat stdout; exit 1; }
  cat stdout
  $EGREP 'understands? -c and -o together.* no$' stdout
  # No repeated checks please.
  test $(grep -c ".*-c['\" ].*-o['\" ]" stdout) -eq 1
  $MAKE
  
  :
  

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