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# mmap-anon.m4 serial 4
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dnl Copyright (C) 2005, 2007 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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AC_DEFUN([gl_FUNC_MMAP_ANON],
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dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
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AC_REQUIRE([AC_PROG_CPP])
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AC_REQUIRE([AC_PROG_EGREP])
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dnl Persuade glibc <sys/mman.h> to define MAP_ANONYMOUS.
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AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
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# Try to allow MAP_ANONYMOUS.
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gl_have_mmap_anonymous=no
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if test $ac_cv_func_mmap_fixed_mapped = yes; then
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AC_MSG_CHECKING([for MAP_ANONYMOUS])
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AC_EGREP_CPP([I cant identify this map.], [
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I cant identify this map.
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[gl_have_mmap_anonymous=yes])
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if test $gl_have_mmap_anonymous != yes; then
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AC_EGREP_CPP([I cant identify this map.], [
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I cant identify this map.
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[AC_DEFINE(MAP_ANONYMOUS, MAP_ANON,
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[Define to a substitute value for mmap()'s MAP_ANONYMOUS flag.])
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gl_have_mmap_anonymous=yes])
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AC_MSG_RESULT($gl_have_mmap_anonymous)
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if test $gl_have_mmap_anonymous = yes; then
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AC_DEFINE(HAVE_MAP_ANONYMOUS, 1,
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[Define to 1 if mmap()'s MAP_ANONYMOUS flag is available after including
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config.h and <sys/mman.h>.])