diff options
Diffstat (limited to 'ports/winnt/include/msvc_ssl_autolib.h')
| -rw-r--r-- | ports/winnt/include/msvc_ssl_autolib.h | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/ports/winnt/include/msvc_ssl_autolib.h b/ports/winnt/include/msvc_ssl_autolib.h new file mode 100644 index 000000000000..688b5e262007 --- /dev/null +++ b/ports/winnt/include/msvc_ssl_autolib.h @@ -0,0 +1,94 @@ +/* + * msvc_ssl_autolib.h -- automatic link library selection + * + * Written by Juergen Perlinger (perlinger@ntp.org) for the NTP project. + * The contents of 'html/copyright.html' apply. + * -------------------------------------------------------------------- + * + * OpenSSL library names changed over time, at least once when v1.1.0 + * emerged. For systems where the build system is inspected before + * the build environment is created (autconf, CMake, SCONS,...) this + * would be harmless, once it's known what libraries should be looked + * for. With MSVC / MSBUILD that's much trickier. + * + * So instead of manipulating the build environment we use the build + * tools themselves to create requests for linking the right library. + * + * To use this feature, it is recommended to use the precompiled + * VC binaries from Shining Light Productions: + * https://slproweb.com/products/Win32OpenSSL.html + * These are installed in (OPENSSL_LIB)/vc. + * + * As an alternative, create the set of build variants of OpenSSL you + * need, implementing the following naming scheme: + * + * basename<width><RT><DebRel>.lib + * + * so that e.g. libcrypto64MTd.lib is a 64bit binary, using a static + * multithreaded runtime in debug version. See the code below how this + * is handled. + * -------------------------------------------------------------------- + */ +#pragma once + +#if !defined(_MSC_VER) +# error use this header only with Micro$oft Visual C compilers! +#elif defined(OPENSSL_NO_AUTOLINK) +# pragma message("automatic OpenSSL library selection disabled") +#else +/* ---------------------------------------------------------------- */ +/* selection dance to get the right libraries linked */ +/* ---------------------------------------------------------------- */ + +/* --*-- check if this a DEBUG or a RELEASE build --*-- + * The '_DEBUG' macro is only set for DEBUG build variants + */ +# ifdef _DEBUG +# define LTAG_DEBUG "d" +# else +# define LTAG_DEBUG "" +# endif + +/* --*-- check platform (32 bit vs. 64 bit) --*-- + * '_WIN64' is defined for X64 Platform only + */ +# ifdef _WIN64 +# define LTAG_SIZE "64" +# else +# define LTAG_SIZE "32" +# endif + +/* --*-- check VC runtime model --*-- + * '_DLL' is set if a runtime-in-a-dll code generation model is chosen. + * Note that we do not check for the single-threaded static runtime. + * This would make no sense, since the Windows Build *uses* threads and + * therefore needs a multithread runtime anyway. And Micro$oft decided + * somewhere after VS2008 to drop that model anyway, so it's no longer + * available on newer platforms. + */ +# ifdef _DLL +# #define LTAG_RTLIB "MD" +# else +# define LTAG_RTLIB "MT" +# endif + +/* --*-- place linker request in object file --*-- + * Here we come to the reason for all that trouble: the library names + * to link depend on the OpenSSL version... + * + * Before v1.1.0, the 'old' (ancient?) name 'libeay32' was used, + * no matter what platform. (The corresponding 'ssleay32.lib' was/is + * not used by NTP.) Since v1.1.0, the name stems are libcrypto + * and libssl, and they contain the platform size (32 or 64). + * + * So we use '#pragma comment(lib,...)' to place a proper linker + * request in the object file, depending on the SSL version and the + * build variant. + */ +# if OPENSSL_VERSION_NUMBER >= 0x10100000L +# pragma comment(lib, "libcrypto" LTAG_SIZE LTAG_RTLIB LTAG_DEBUG ".lib") +# else +# pragma comment(lib, "libeay32" LTAG_RTLIB LTAG_DEBUG ".lib") +# endif + +#endif /*!defined(OPENSSL_NO_AUTOLINK)*/ |