diff options
Diffstat (limited to 'm4/sanity.m4')
| -rw-r--r-- | m4/sanity.m4 | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/m4/sanity.m4 b/m4/sanity.m4 new file mode 100644 index 0000000..5cb5f27 --- /dev/null +++ b/m4/sanity.m4 @@ -0,0 +1,42 @@ +# +# Check to make sure that the build environment is sane. +# + +AC_DEFUN(AM_SANITY_CHECK, +[AC_MSG_CHECKING([whether build environment is sane]) +# Just in case +sleep 1 +echo timestamp > conftest.file +# Do `set' in a subshell so we don't clobber the current shell's +# arguments. Must try -L first in case configure is actually a +# symlink; some systems play weird games with the mod time of symlinks +# (eg FreeBSD returns the mod time of the symlink's containing +# directory). +if ( + set X `ls -Lt $srcdir/configure conftest.file 2> /dev/null` + if test "[$]*" = "X"; then + # -L didn't work. + set X `ls -t $srcdir/configure conftest.file` + fi + if test "[$]*" != "X $srcdir/configure conftest.file" \ + && test "[$]*" != "X conftest.file $srcdir/configure"; then + + # If neither matched, then we have a broken ls. This can happen + # if, for instance, CONFIG_SHELL is bash and it inherits a + # broken ls alias from the environment. This has actually + # happened. Such a system could not be considered "sane". + AC_MSG_ERROR([ls -t appears to fail. Make sure there is not a broken +alias in your environment]) + fi + + test "[$]2" = conftest.file + ) +then + # Ok. + : +else + AC_MSG_ERROR([newly created file is older than distributed files! +Check your system clock]) +fi +rm -f conftest* +AC_MSG_RESULT([yes])]) |