44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
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dnl Check for presence of the Ragel State Machine generator.
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dnl
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dnl This macro checks for the presence of the ragel tool in the system,
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dnl and whether the ragel tool is absolutely needed for a complete
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dnl build.
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dnl
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dnl To check for the need for Ragel, you have to provide the relative
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dnl path of a source file generated through Ragel: if the file is
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dnl present in the source tree, a missing ragel command will not cause
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dnl the configure to abort.
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AC_DEFUN([_RAGEL_VARS], [
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AC_ARG_VAR([RAGEL], [Ragel generator command])
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AC_ARG_VAR([RAGELFLAGS], [Ragel generator flags])
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])
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AC_DEFUN([CHECK_RAGEL], [
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AC_REQUIRE([_RAGEL_VARS])
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AC_CHECK_PROG([RAGEL], [ragel], [ragel], [no])
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dnl We set RAGEL to false so that it would execute the "false"
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dnl command if needed.
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AS_IF([test x"$RAGEL" = x"no"], [RAGEL=false])
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dnl Only test the need if not found
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AS_IF([test x"$RAGEL" = x"false"], [
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AC_MSG_CHECKING([whether we need ragel to regenerate sources])
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AS_IF([test -a ${srcdir}/$1], [ragel_needed=no], [ragel_needed=yes])
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AC_MSG_RESULT([$ragel_needed])
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AS_IF([test x"$ragel_needed" = x"yes"],
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[AC_MSG_ERROR([dnl
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You need Ragel to build from GIT checkouts.
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You can find Ragel at http://www.complang.org/ragel/dnl
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])])
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])
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])
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AC_DEFUN([CHECK_RAGEL_AM], [
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CHECK_RAGEL([$1])
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AM_CONDITIONAL([HAVE_RAGEL], [test x"$RAGEL" != x"false"])
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])
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