Re: [Bug-apl] Cygwin64 Build Errors

[Juergen Sauermann]

Hi, in principle yes. I already had that check in configure.ac in  SVN 185: # check if compiler knows -rdynamic # AC_MSG_CHECKING([whether $CXX accepts -rdynamic]) apl_save_CXXFLAGS=$CXXFLAGS CXXFLAGS="-rdynamic" AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [CAN_rdynamic=yes], [CAN_rdynamic=no]) CXXFLAGS=$apl_save_CXXFLAGS if test "x$CAN_rdynamic" = "xyes"; then AC_SUBST([CXX_RDYNAMIC], ["-rdynamic"]) fi AC_MSG_RESULT([$CAN_rdynamic]) But somehow that check didn't work (the check succeeded but the subsequent make failed, I believe for clang). But maybe I was simply missing -Werror -Wall in the CXXFLAGS of ./configure. We can give it another try, but someone needs to check it on his machine because on mine. it always works. I believe the proper check should be something like: # check if compiler knows -rdynamic # AC_MSG_CHECKING([whether $CXX accepts -rdynamic]) apl_save_CXXFLAGS=$CXXFLAGS CXXFLAGS="-rdynamic -Werror -Wall" AC_COMPILE_IFELSE([AC_LANG_PROGRAM()], [CAN_rdynamic=yes], [CAN_rdynamic=no]) CXXFLAGS=$apl_save_CXXFLAGS if test "x$CAN_rdynamic" = "xyes"; then AC_SUBST([CXX_RDYNAMIC], ["-rdynamic"]) fi AC_MSG_RESULT([$CAN_rdynamic]) /// Jürgen On 08/16/2015 03:29 PM, Elias Mårtenson wrote: Isn't a test as simple as simply trying to compile an empty program using -rdynamic and set -Werrors. If it passes, -rdynamic works. Otherwise don't use it. Regards, Elias On 16 August 2015 at 16:27, Mike Duvos <m...@wolf359.net> wrote: Hi Jürgen, -rdynamic passes -export-dynamic to an ELF linker.  Windows isn't ELF, so the flag is meaningless under Cygwin. If you just change the makefile to never use -rdynamic if it detects Cygwin/Windows, all other things being equal, that should fix it for Cygwin, without breaking it on any other platforms. Regards, Mike