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AX_REQUIRE_ONE_FUNC (FUNCTION..., [ACTION-IF-ANY-FOUND], [ACTION-IF-NONE-FOUND])
AX_REQUIRE_ONE_FUNC is a simple wrapper for AC_CHECK_FUNCS. It calls AC_CHECK_FUNCS on the list of functions named in the first argument, then invokes ACTION-IF-ANY-FOUND if at least one of the functions exists or ACTION-IF-NONE-FOUND if none of the functions exist.
Here’s an example:
AX_REQUIRE_ONE_FUNC([posix_memalign memalign valloc], ,
[AC_MSG_ERROR([unable to allocate page-aligned memory])])
Download the latest version of ax_require_one_func.m4 or browse the macro’s revision history.
Copyright © 2008 Scott Pakin pakin@uiuc.edu
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