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d2a8c29880
- This currently just moves over all of the behavior from LLVM. Eventually all of the configure checks that are directly needed by the LLVM build setup should probably go away, and the project should manage their own configuration checks if necessary. - This is the 1st half of this work, the actual Makefile.common hasn't moved over yet. I've tried to stage this in such a way that incremental builds will properly reconfigure for most active developers (the Makefiles don't handle reconfiguring in a perfectly reliable way, and I haven't found an easy way to make them do so). llvm-svn: 142456
22 lines
710 B
Plaintext
22 lines
710 B
Plaintext
#
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# Check for anonymous mmap macros. This is modified from
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# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_slist.html
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#
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AC_DEFUN([AC_HEADER_MMAP_ANONYMOUS],
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[AC_CACHE_CHECK(for MAP_ANONYMOUS vs. MAP_ANON,
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ac_cv_header_mmap_anon,
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[ AC_LANG_PUSH([C])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
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[[#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>]],
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[[mmap (0, 1, PROT_READ, MAP_ANONYMOUS, -1, 0); return (0);]])],
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ac_cv_header_mmap_anon=yes,
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ac_cv_header_mmap_anon=no)
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AC_LANG_POP([C])
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])
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if test "$ac_cv_header_mmap_anon" = yes; then
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AC_DEFINE([HAVE_MMAP_ANONYMOUS],[1],[Define if mmap() uses MAP_ANONYMOUS to map anonymous pages, or undefine if it uses MAP_ANON])
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fi
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])
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