| 1 | #
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| 2 | # Check to make sure that the build environment is sane.
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| 3 | #
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| 4 |
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| 5 | # Copyright (C) 1996, 1997, 2000, 2001, 2003 Free Software Foundation, Inc.
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| 6 |
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| 7 | # This program is free software; you can redistribute it and/or modify
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| 8 | # it under the terms of the GNU General Public License as published by
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| 9 | # the Free Software Foundation; either version 2, or (at your option)
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| 10 | # any later version.
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| 11 |
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| 12 | # This program is distributed in the hope that it will be useful,
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | # GNU General Public License for more details.
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| 16 |
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| 17 | # You should have received a copy of the GNU General Public License
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| 18 | # along with this program; if not, write to the Free Software
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| 19 | # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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| 20 | # 02111-1307, USA.
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| 21 |
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| 22 | # serial 3
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| 23 |
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| 24 | # AM_SANITY_CHECK
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| 25 | # ---------------
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| 26 | AC_DEFUN([AM_SANITY_CHECK],
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| 27 | [AC_MSG_CHECKING([whether build environment is sane])
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| 28 | # Just in case
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| 29 | sleep 1
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| 30 | echo timestamp > conftest.file
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| 31 | # Do `set' in a subshell so we don't clobber the current shell's
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| 32 | # arguments. Must try -L first in case configure is actually a
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| 33 | # symlink; some systems play weird games with the mod time of symlinks
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| 34 | # (eg FreeBSD returns the mod time of the symlink's containing
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| 35 | # directory).
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| 36 | if (
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| 37 | set X `ls -Lt $srcdir/configure conftest.file 2> /dev/null`
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| 38 | if test "$[*]" = "X"; then
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| 39 | # -L didn't work.
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| 40 | set X `ls -t $srcdir/configure conftest.file`
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| 41 | fi
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| 42 | rm -f conftest.file
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| 43 | if test "$[*]" != "X $srcdir/configure conftest.file" \
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| 44 | && test "$[*]" != "X conftest.file $srcdir/configure"; then
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| 45 |
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| 46 | # If neither matched, then we have a broken ls. This can happen
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| 47 | # if, for instance, CONFIG_SHELL is bash and it inherits a
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| 48 | # broken ls alias from the environment. This has actually
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| 49 | # happened. Such a system could not be considered "sane".
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| 50 | AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken
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| 51 | alias in your environment])
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| 52 | fi
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| 53 |
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| 54 | test "$[2]" = conftest.file
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| 55 | )
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| 56 | then
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| 57 | # Ok.
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| 58 | :
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| 59 | else
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| 60 | AC_MSG_ERROR([newly created file is older than distributed files!
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| 61 | Check your system clock])
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| 62 | fi
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| 63 | AC_MSG_RESULT(yes)])
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