t/link_cond.sh

   1 #! /bin/sh
   2 # Copyright (C) 2012-2017 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 # Test that automatic determination of the linker works well with
  18 # conditional use of languages in a single program.
  19 # This currently doesn't truly work, but we have an easy workaround
  20 # at least, that is tested here.
  21 # See automake bug#11089.
  22
  23 required='cc c++'
  24 . test-init.sh
  25
  26 cat >> configure.ac << 'END'
  27 AC_PROG_CC
  28 AC_PROG_CXX
  29 AM_CONDITIONAL([HAVE_CXX], [test $have_cxx = yes])
  30 AC_OUTPUT
  31 END
  32
  33 cat > Makefile.am << 'END'
  34 bin_PROGRAMS = foo
  35 if HAVE_CXX
  36 foo_SOURCES = more.c++
  37 else
  38 foo_SOURCES = less.c
  39 endif
  40 ## FIXME: ideally, this workaround shouldn't be needed.
  41 if HAVE_CXX
  42 foo_LINK = $(CXXLINK)
  43 else
  44 foo_LINK = $(LINK)
  45 endif
  46 END
  47
  48 $ACLOCAL
  49 $AUTOMAKE
  50 $AUTOCONF
  51
  52 rm -f *.c++
  53 cat > less.c <<'END'
  54 /* Valid C but deliberately invalid C++ */
  55 main ()
  56 {
  57   int new = 0;
  58   return new;
  59 }
  60 END
  61
  62 ./configure have_cxx=no
  63 run_make CXX=false
  64
  65 # Sanity check.
  66 rm -f foo foo.exe
  67 run_make CC=false && fatal_ '"make CC=false" succeeded unexpectedly'
  68
  69 $MAKE distclean
  70
  71 rm -f *.c
  72 cat > more.c++ <<'END'
  73 /* Valid C++ but deliberately invalid C */
  74 using namespace std;
  75 int main (void)
  76 {
  77   return 0;
  78 }
  79 END
  80
  81 ./configure have_cxx=yes
  82 run_make CC=false
  83
  84 # Sanity check.
  85 rm -f foo foo.exe
  86 run_make CXX=false && fatal_ '"make CXX=false" succeeded unexpectedly'
  87
  88 :