Re: Dynamically calling shared objects from statically build executable allowed
On Monday, 10 February 2020 at 19:39:04 UTC, Ernesto Castellotti wrote: On Monday, 10 February 2020 at 19:00:36 UTC, Andre Pany wrote: [...] Static libraries are simple collections of object files, there is no difference between linking a static library or several object files If you notice when going to compile the executable linka libdl and the static library, then the executable will be linked to dynamic library and will not be a static executable. Thanks for the explanation. Kind regards André
Re: Dynamically calling shared objects from statically build executable allowed
On Monday, 10 February 2020 at 19:00:36 UTC, Andre Pany wrote: On Monday, 10 February 2020 at 13:14:50 UTC, Ernesto Castellotti wrote: On Monday, 10 February 2020 at 04:41:31 UTC, Andre Pany wrote: Is this a bug with LDC and DMD, or is it not allowed to dynamically call a SO from a statically build executable on linux On Unix systems it is not possible to dynamically load a library shared by a static executable, I don't know if it works differently for Windows. This is because it is absolutely necessary to link libdl dynamically, you cannot link static. For GNU/Linux systems there is this alternative to dlopen/dlsym that does not require dynamic link: https://www.gnu.org/software/libtool/manual/html_node/Dlpreopening.html This is a topic I almost have no knowledge, therefore a question. If I understand this StackOverflow question correctly, it is possible to call dynamically a shared object from a static library (with dlopen): https://stackoverflow.com/questions/17862272/dlopen-a-dynamic-library-from-a-static-library-linux-c But I understand from you it is not possible dynamically call a shared object from a static executable. Therefore it works for static libraries but not for statically executables? Kind regards Andre Static libraries are simple collections of object files, there is no difference between linking a static library or several object files If you notice when going to compile the executable linka libdl and the static library, then the executable will be linked to dynamic library and will not be a static executable.
Re: Dynamically calling shared objects from statically build executable allowed
On Monday, 10 February 2020 at 13:14:50 UTC, Ernesto Castellotti wrote: On Monday, 10 February 2020 at 04:41:31 UTC, Andre Pany wrote: Is this a bug with LDC and DMD, or is it not allowed to dynamically call a SO from a statically build executable on linux On Unix systems it is not possible to dynamically load a library shared by a static executable, I don't know if it works differently for Windows. This is because it is absolutely necessary to link libdl dynamically, you cannot link static. For GNU/Linux systems there is this alternative to dlopen/dlsym that does not require dynamic link: https://www.gnu.org/software/libtool/manual/html_node/Dlpreopening.html This is a topic I almost have no knowledge, therefore a question. If I understand this StackOverflow question correctly, it is possible to call dynamically a shared object from a static library (with dlopen): https://stackoverflow.com/questions/17862272/dlopen-a-dynamic-library-from-a-static-library-linux-c But I understand from you it is not possible dynamically call a shared object from a static executable. Therefore it works for static libraries but not for statically executables? Kind regards Andre
Re: Dynamically calling shared objects from statically build executable allowed
On Monday, 10 February 2020 at 04:41:31 UTC, Andre Pany wrote: Is this a bug with LDC and DMD, or is it not allowed to dynamically call a SO from a statically build executable on linux On Unix systems it is not possible to dynamically load a library shared by a static executable, I don't know if it works differently for Windows. This is because it is absolutely necessary to link libdl dynamically, you cannot link static. For GNU/Linux systems there is this alternative to dlopen/dlsym that does not require dynamic link: https://www.gnu.org/software/libtool/manual/html_node/Dlpreopening.html
