Prevent unary_function warning and other warnings #449

configure.ac

@@ -644,6 +644,17 @@ AX_BOOST_PROGRAM_OPTIONS
 AX_BOOST_THREAD
 AX_BOOST_CHRONO
 
+dnl Prevent use of std::unary_function, which was removed in C++17,
+dnl and will generate warnings with newer compilers for Boost
+dnl older than 1.80.
+dnl See: https://github.com/boostorg/container_hash/issues/22, https://github.com/boostorg/config/pull/430.
+
+dnl _HAS_AUTO_PTR_ETC check required only for boost 1.72 and older, for 1.73+ we can use BOOST_NO_CXX98_FUNCTION_BASE
+AX_CHECK_PREPROC_FLAG([-D_HAS_AUTO_PTR_ETC=0], [BOOST_CPPFLAGS="$BOOST_CPPFLAGS -D_HAS_AUTO_PTR_ETC=0"], [], [$CXXFLAG_WERROR],
+                      [AC_LANG_PROGRAM([[#include <boost/config.hpp>]])])
+AX_CHECK_PREPROC_FLAG([-DBOOST_NO_CXX98_FUNCTION_BASE], [BOOST_CPPFLAGS="$BOOST_CPPFLAGS -DBOOST_NO_CXX98_FUNCTION_BASE"], [], [$CXXFLAG_WERROR],
+                      [AC_LANG_PROGRAM([[#include <boost/config.hpp>]])])
+
 fi
 
 if test x$use_reduce_exports = xyes; then
@@ -947,11 +958,12 @@ echo
 echo "  target os     = $TARGET_OS"
 echo "  build os      = $BUILD_OS"
 echo
-echo "  CC            = $CC"
-echo "  CFLAGS        = $CFLAGS"
-echo "  CPPFLAGS      = $CPPFLAGS"
-echo "  CXX           = $CXX"
-echo "  CXXFLAGS      = $CXXFLAGS"
-echo "  LDFLAGS       = $LDFLAGS"
-echo "  ARFLAGS       = $ARFLAGS"
+echo "  CC             = $CC"
+echo "  CFLAGS         = $CFLAGS"
+echo "  CPPFLAGS       = $CPPFLAGS"
+echo "  CXX            = $CXX"
+echo "  CXXFLAGS       = $CXXFLAGS"
+echo "  BOOST_CPPFLAGS = $BOOST_CPPFLAGS"
+echo "  LDFLAGS        = $LDFLAGS"
+echo "  ARFLAGS        = $ARFLAGS"
 echo