44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
dnl ######################################################################
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dnl NTP_VPATH_HACK
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dnl
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dnl Compiling ntpd doesn't require YACC or Bison unless ntp_parser.y is
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dnl modified, because the output ntp_parser.[ch] are committed. This
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dnl raises an issue with Automake-generated Makefiles on non-GNU make
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dnl used from a build tree outside the source tree.
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dnl
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dnl With GNU make, ylwrap updates $srcdir/ntp_parser.[ch] directly.
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dnl Under Sun or BSD make, ylwrap needs those files to be in the build
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dnl tree.
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dnl
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dnl With VPATH_HACK enabled, ntpd/Makefile.am includes code to symlink
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dnl from ntp_parser.[ch] in the build tree to the corresponding files
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dnl in $srcdir, and to check for ylwrap replacing the .h with a normal
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dnl file, and in that case copy the updated .h to $srcdir and restore
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dnl the symlink.
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dnl
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dnl if we are building outside the srcdir and either
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dnl force_ntp_vpath_hack is yes
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dnl or
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dnl we're not using GNU make
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dnl then we want VPATH_HACK to be true for .am tests
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dnl
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AC_DEFUN([NTP_VPATH_HACK], [
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AC_MSG_CHECKING([to see if we need ylwrap VPATH hack])
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ntp_vpath_hack="no"
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case "$srcdir::${force_ntp_vpath_hack-no}" in
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.::*)
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;; # VPATH_HACK path is for VPATH builds only.
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*::yes)
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ntp_vpath_hack="yes"
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;;
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*::*)
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case "`${MAKE-make} -v -f /dev/null 2>/dev/null | grep 'GNU Make'`" in
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'')
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ntp_vpath_hack="yes"
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esac
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esac
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AC_MSG_RESULT([$ntp_vpath_hack])
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AM_CONDITIONAL([VPATH_HACK], [test x$ntp_vpath_hack = xyes])
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])
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dnl ======================================================================
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