github.com/jlmucb/cloudproxy@v0.0.0-20170830161738-b5aa0b619bc4/src/third_party/gflags/m4/namespaces.m4 (about)

     1  # Checks whether the compiler implements namespaces
     2  AC_DEFUN([AC_CXX_NAMESPACES],
     3   [AC_CACHE_CHECK(whether the compiler implements namespaces,
     4                   ac_cv_cxx_namespaces,
     5                   [AC_LANG_SAVE
     6                    AC_LANG_CPLUSPLUS
     7                    AC_TRY_COMPILE([namespace Outer {
     8                                      namespace Inner { int i = 0; }}],
     9                                   [using namespace Outer::Inner; return i;],
    10                                   ac_cv_cxx_namespaces=yes,
    11                                   ac_cv_cxx_namespaces=no)
    12                    AC_LANG_RESTORE])
    13    if test "$ac_cv_cxx_namespaces" = yes; then
    14      AC_DEFINE(HAVE_NAMESPACES, 1, [define if the compiler implements namespaces])
    15    fi])