activemq-cpp/m4/check_visibility.m4

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dnl
dnl check_visibility.m4 - checks support for visibility family of CXX flags
dnl
dnl This macro determines whether or not the CXX flags -fvisibility and 
dnl -fvisibility-inlines-hidden are allowed with the compiler.  
dnl
dnl If so, the result is "yes" and HAVE_VISIBILITY_OPTIONS is defined.  Else, the
dnl result is "no". 
dnl

AC_DEFUN([CHECK_VISIBILITY], [
    AC_MSG_CHECKING([whether -fvisibility flags work])
           
    OLDCXXFLAGS="$CXXFLAGS"
    CXXFLAGS="$CXXFLAGS -Werror -fvisibility=hidden -fvisibility-inlines-hidden"
    
    AC_TRY_COMPILE([],
      [
      ],
      [
        AC_MSG_RESULT(yes)
        AC_DEFINE([HAVE_VISIBILITY_OPTIONS],[], [define if you have -fvisibility options])
      ],
      [
        AC_MSG_RESULT(no)
      ])
      
    CXXFLAGS="$OLDCXXFLAGS"
])