t/perf/cond.sh

   1 #!/bin/sh
   2 # Copyright (C) 2003-2018 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 # Check that many conditions do not lead to combinatorial explosion.
  18 # (This is related to PR/352.)
  19
  20 . test-init.sh
  21
  22 echo AC_PROG_CC >>configure.ac
  23
  24 cat >Makefile.am <<EOF
  25 bin_PROGRAMS = a
  26 a02_LDADD =
  27 a03_SOURCES =
  28 EOF
  29
  30 # On this test, Automake 1.7.x would compute all 2**24 = 16777216
  31 # possible combinations of conditionals (it would do this five times,
  32 # to define a01_DEPENDENCIES, a02_DEPENDENCIES, a03_OBJECTS,
  33 # a04_OBJECTS, and to rewrite bin_PROGRAM), eating all memory, swap,
  34 # or cpu time it can found.
  35
  36 for i in \
  37   01 02 03 04 05 06 07 08 09 10 \
  38   11 12 13 14 15 16 17 18 19 20 \
  39   21 22 23 24
  40 do
  41   unindent >>Makefile.am <<EOF
  42     if C$i
  43     bin_PROGRAMS += a$i
  44     a01_LDADD = foo${i}.o
  45     a02_LDADD += bar${i}.o
  46     a03_SOURCES += baz${i}.c
  47     a04_SOURCES = quux${i}.c
  48     endif C$i
  49 EOF
  50   echo "AM_CONDITIONAL([C$i], [:])" >>configure.ac
  51 done
  52
  53 $ACLOCAL
  54 $AUTOMAKE
  55
  56 :