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8e633294c2
AC_CONFIG_HEADERS. This should prevent LLVM from needlessly re-compiling on a re-configure. llvm-svn: 16510
23 lines
789 B
Plaintext
23 lines
789 B
Plaintext
#
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# Check for bidirectional iterator extension. This is modified from
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# http://www.gnu.org/software/ac-archive/htmldoc/ac_cxx_have_ext_hash_set.html
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#
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AC_DEFUN([AC_CXX_HAVE_BI_ITERATOR],
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[AC_CACHE_CHECK(whether the compiler has the bidirectional iterator,
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ac_cv_cxx_have_bi_iterator,
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[AC_REQUIRE([AC_CXX_NAMESPACES])
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AC_LANG_PUSH([C++])
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iterator>
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#ifdef HAVE_NAMESPACES
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using namespace std;
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#endif]], [[bidirectional_iterator<int,int> t; return 0;]])],[ac_cv_cxx_have_bi_iterator=yes],[ac_cv_cxx_have_bi_iterator=no])
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AC_LANG_POP([C++])
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])
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if test "$ac_cv_cxx_have_bi_iterator" = yes
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then
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AC_DEFINE(HAVE_BI_ITERATOR,1,[Have bi-directional iterator])
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else
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AC_DEFINE(HAVE_BI_ITERATOR,0,[Does not have bi-directional iterator])
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fi
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])
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