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/thirdparty/breakpad/third_party/protobuf/protobuf/m4/stl_hash.m4

http://github.com/tomahawk-player/tomahawk
m4 | 72 lines | 55 code | 2 blank | 15 comment | 0 complexity | e1d4dbf00eda137f0390a21e5c465e64 MD5 | raw file
 1# We check two things: where the include file is for
 2# unordered_map/hash_map (we prefer the first form), and what
 3# namespace unordered/hash_map lives in within that include file.  We
 4# include AC_TRY_COMPILE for all the combinations we've seen in the
 5# wild.  We define HASH_MAP_H to the location of the header file, and
 6# HASH_NAMESPACE to the namespace the class (unordered_map or
 7# hash_map) is in.  We define HAVE_UNORDERED_MAP if the class we found
 8# is named unordered_map, or leave it undefined if not.
 9
10# This also checks if unordered map exists.
11AC_DEFUN([AC_CXX_STL_HASH],
12  [
13   AC_MSG_CHECKING(the location of hash_map)
14   AC_LANG_SAVE
15   AC_LANG_CPLUSPLUS
16   ac_cv_cxx_hash_map=""
17   # First try unordered_map, but not on gcc's before 4.2 -- I've
18   # seen unexplainable unordered_map bugs with -O2 on older gcc's.
19   AC_TRY_COMPILE([#if defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 2))
20                   # error GCC too old for unordered_map
21                   #endif
22                   ],
23                   [/* no program body necessary */],
24                   [stl_hash_old_gcc=no],
25                   [stl_hash_old_gcc=yes])
26   for location in unordered_map tr1/unordered_map; do
27     for namespace in std std::tr1; do
28       if test -z "$ac_cv_cxx_hash_map" -a "$stl_hash_old_gcc" != yes; then
29         # Some older gcc's have a buggy tr1, so test a bit of code.
30         AC_TRY_COMPILE([#include <$location>],
31                        [const ${namespace}::unordered_map<int, int> t;
32                         return t.find(5) == t.end();],
33                        [ac_cv_cxx_hash_map="<$location>";
34                         ac_cv_cxx_hash_namespace="$namespace";
35                         ac_cv_cxx_hash_map_class="unordered_map";])
36       fi
37     done
38   done
39   # Now try hash_map
40   for location in ext/hash_map hash_map; do
41     for namespace in __gnu_cxx "" std stdext; do
42       if test -z "$ac_cv_cxx_hash_map"; then
43         AC_TRY_COMPILE([#include <$location>],
44                        [${namespace}::hash_map<int, int> t],
45                        [ac_cv_cxx_hash_map="<$location>";
46                         ac_cv_cxx_hash_namespace="$namespace";
47                         ac_cv_cxx_hash_map_class="hash_map";])
48       fi
49     done
50   done
51   ac_cv_cxx_hash_set=`echo "$ac_cv_cxx_hash_map" | sed s/map/set/`;
52   ac_cv_cxx_hash_set_class=`echo "$ac_cv_cxx_hash_map_class" | sed s/map/set/`;
53   if test -n "$ac_cv_cxx_hash_map"; then
54      AC_DEFINE(HAVE_HASH_MAP, 1, [define if the compiler has hash_map])
55      AC_DEFINE(HAVE_HASH_SET, 1, [define if the compiler has hash_set])
56      AC_DEFINE_UNQUOTED(HASH_MAP_H,$ac_cv_cxx_hash_map,
57                         [the location of <unordered_map> or <hash_map>])
58      AC_DEFINE_UNQUOTED(HASH_SET_H,$ac_cv_cxx_hash_set,
59                         [the location of <unordered_set> or <hash_set>])
60      AC_DEFINE_UNQUOTED(HASH_NAMESPACE,$ac_cv_cxx_hash_namespace,
61                         [the namespace of hash_map/hash_set])
62      AC_DEFINE_UNQUOTED(HASH_MAP_CLASS,$ac_cv_cxx_hash_map_class,
63                         [the name of <hash_map>])
64      AC_DEFINE_UNQUOTED(HASH_SET_CLASS,$ac_cv_cxx_hash_set_class,
65                         [the name of <hash_set>])
66      AC_MSG_RESULT([$ac_cv_cxx_hash_map])
67   else
68      AC_MSG_RESULT()
69      AC_MSG_WARN([could not find an STL hash_map])
70   fi
71])
72