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