t/am-prog-cc-c-o.sh

   1 #! /bin/sh
   2 # Copyright (C) 2013-2015 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 <http://www.gnu.org/licenses/>.
  16
  17 # Check that uses of the obsolescent AM_PROG_CC_C_O macro doesn't
  18 # cause spurious warnings or errors.  Suggested by Eric Blake.
  19
  20 # We need gcc for for two reasons:
  21 #  1. to ensure our C compiler grasps "-c -o" together.
  22 #  2. to be able to later fake a dumb compiler not grasping that
  23 #     (done with 'cc-no-c-o' script below, which required gcc).
  24 required=gcc
  25 . test-init.sh
  26
  27 echo bin_PROGRAMS = foo > Makefile.am
  28 echo 'int main (void) { return 0; }' > foo.c
  29
  30 cp configure.ac configure.bak
  31
  32 cat > acinclude.m4 <<'END'
  33 AC_DEFUN([AM_TWEAKED_OUTPUT], [
  34 # For debugging.
  35 printf "CC = '%s'\\n" "$CC"
  36 # Make sure that $CC can be used after AM_PROG_CC_C_O.
  37 $CC --version || exit 1
  38 $CC -v || exit 1
  39 # $CC rewrite should only take place on time.
  40 case " $CC " in
  41   *" compile"*" compile"*) AC_MSG_ERROR([CC rewritten twice]);;
  42 esac
  43 AC_OUTPUT
  44 ])
  45 END
  46
  47 # ---
  48
  49 cat configure.bak - > configure.ac << 'END'
  50 dnl It's OK to call AM_PROG_CC_C_O after AC_PROG_CC.
  51 AC_PROG_CC
  52 AM_PROG_CC_C_O
  53 AM_TWEAKED_OUTPUT
  54 END
  55
  56 $ACLOCAL
  57 $AUTOCONF
  58 $AUTOMAKE --add-missing
  59
  60 ./configure >stdout || { cat stdout; exit 1; }
  61 cat stdout
  62 if test "$AM_TESTSUITE_SIMULATING_NO_CC_C_O" != no; then
  63   $EGREP 'understands? -c and -o together.* no$' stdout
  64 else
  65   $EGREP 'understands? -c and -o together.* yes$' stdout
  66 fi
  67
  68 # No repeated checks please.
  69 test $(grep -c ".*-c['\" ].*-o['\" ]" stdout) -eq 1
  70
  71 $MAKE
  72 $MAKE maintainer-clean
  73 rm -rf autom4te*.cache
  74
  75 # ---
  76
  77 cat configure.bak - > configure.ac << 'END'
  78 dnl It's also OK to call AM_PROG_CC_C_O *before* AC_PROG_CC.
  79 AM_PROG_CC_C_O
  80 AC_PROG_CC
  81 AM_TWEAKED_OUTPUT
  82 END
  83
  84 $ACLOCAL
  85 $AUTOCONF
  86 $AUTOMAKE --add-missing
  87
  88 ./configure >stdout || { cat stdout; exit 1; }
  89 cat stdout
  90 if test "$AM_TESTSUITE_SIMULATING_NO_CC_C_O" != no; then
  91   $EGREP 'understands? -c and -o together.* no$' stdout
  92 else
  93   $EGREP 'understands? -c and -o together.* yes$' stdout
  94 fi
  95
  96 # Repeated checks are OK in this case, but should be cached.
  97 test $(grep ".*-c['\" ].*-o['\" ]" stdout \
  98         | $FGREP -v ' (cached) ' | wc -l) -eq 1
  99
 100 $MAKE
 101 $MAKE maintainer-clean
 102 rm -rf autom4te*.cache
 103
 104 # ---
 105
 106 cat configure.bak - > configure.ac << 'END'
 107 dnl It's also OK to call AM_PROG_CC_C_O *without* AC_PROG_CC.
 108 AM_PROG_CC_C_O
 109 AM_TWEAKED_OUTPUT
 110 END
 111
 112 $ACLOCAL
 113 $AUTOCONF
 114 $AUTOMAKE --add-missing
 115
 116 # Make sure the compiler doesn't understand '-c -o'
 117 CC=$am_testaux_builddir/cc-no-c-o; export CC
 118
 119 ./configure >stdout || { cat stdout; exit 1; }
 120 cat stdout
 121 $EGREP 'understands? -c and -o together.* no$' stdout
 122 # No repeated checks please.
 123 test $(grep -c ".*-c['\" ].*-o['\" ]" stdout) -eq 1
 124 $MAKE
 125
 126 :