1 dnl @synopsis AC_CXX_NAMESPACES
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3 dnl If the compiler can prevent names clashes using namespaces, define
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6 dnl @author Luc Maisonobe
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8 AC_DEFUN([AC_CXX_NAMESPACES],
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9 [AC_CACHE_CHECK(whether the compiler implements namespaces,
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10 ac_cv_cxx_namespaces,
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13 AC_TRY_COMPILE([namespace Outer { namespace Inner { int i = 0; }}],
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14 [using namespace Outer::Inner; return i;],
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15 ac_cv_cxx_namespaces=yes, ac_cv_cxx_namespaces=no)
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18 if test "$ac_cv_cxx_namespaces" = yes; then
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19 AC_DEFINE(HAVE_NAMESPACES,1,[define if the compiler implements namespaces])
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25 dnl @author Luc Maisonobe
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27 AC_DEFUN([AC_CXX_REQUIRE_STL],
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28 [AC_CACHE_CHECK(whether the compiler supports Standard Template Library,
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30 [AC_REQUIRE([AC_CXX_NAMESPACES])
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33 AC_TRY_COMPILE([#include <list>
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35 #ifdef HAVE_NAMESPACES
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36 using namespace std;
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37 #endif],[list<int> x; x.push_back(5);
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38 list<int>::iterator iter = x.begin(); if (iter != x.end()) ++iter; return 0;],
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39 ac_cv_cxx_have_stl=yes, ac_cv_cxx_have_stl=no)
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42 if test "x_$ac_cv_cxx_have_stl" != x_yes; then
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43 AC_MSG_ERROR([C++ Standard Template Libary unsupported])
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47 dnl Determine whether we have gcc of a particular version or later,
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48 dnl based on major, minor, patchlevel versions and date.
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49 dnl AC_HAVE_GCC_VERSION(MAJOR_VERSION, MINOR_VERSION, PATCH_LEVEL,
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50 dnl SNAPSHOT_DATE [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
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51 AC_DEFUN(AC_HAVE_GCC_VERSION,
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52 [AC_CACHE_CHECK([gcc is at least version $1.$2.$3.$4],
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53 ac_cv_gcc_version_$1_$2_$3_$4,
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55 if test x$GCC = x ; then ac_cv_gcc_version_$1_$2_$3_$4=no
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57 ac_gcc_date=`$CC -v 2>&1 | grep '^gcc version ' | sed 's/ (.*//; s/.* //'`
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58 if test 0$ac_gcc_date -eq 0 ; then ac_gcc_date=0 ; fi
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59 AC_EGREP_CPP(yes, [#define HAVE_GCC_VERSION(MAJOR, MINOR, MICRO, DATE) \
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60 (__GNUC__ > (MAJOR) \
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61 || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ > (MINOR)) \
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62 || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ == (MINOR) \
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63 && __GNUC_PATCHLEVEL__ > (MICRO)) \
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64 || (__GNUC__ == (MAJOR) && __GNUC_MINOR__ == (MINOR) \
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65 && __GNUC_PATCHLEVEL__ == (MICRO) && ${ac_gcc_date}L >= (DATE)))
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66 #if HAVE_GCC_VERSION($1,$2,$3,$4)
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69 AC_DEFINE_UNQUOTED(HAVE_GCC_VERSION_$1_$2_$3_$4, 1,
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70 [Define to 1 if we have gcc $1.$2.$3 ($4)])
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71 ac_cv_gcc_version_$1_$2_$3_$4=yes ; $5,
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72 ac_cv_gcc_version_$1_$2_$3_$4=no ; $6)
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