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NOTES FOR THE WINDOWS PLATFORMS
===============================
[Notes for Windows CE can be found in INSTALL.WCE]
Requirement details for native (Visual C++) builds
--------------------------------------------------
- You need Perl. We recommend ActiveState Perl, available from
http://www.activestate.com/ActivePerl.
You also need the perl module Text::Template, available on CPAN.
Please read README.PERL for more information.
- You need a C compiler. OpenSSL has been tested to build with these:
* Visual C++
- Netwide Assembler, a.k.a. NASM, available from http://www.nasm.us,
is required if you intend to utilize assembler modules. Note that NASM
is the only supported assembler. The Microsoft provided assembler is NOT
supported.
GNU C (Cygwin)
--------------
Cygwin implements a Posix/Unix runtime system (cygwin1.dll) on top of the
Windows subsystem and provides a bash shell and GNU tools environment.
Consequently, a make of OpenSSL with Cygwin is virtually identical to the
Unix procedure. It is also possible to create Windows binaries that only
use the Microsoft C runtime system (msvcrt.dll or crtdll.dll) using
MinGW. MinGW can be used in the Cygwin development environment or in a
standalone setup as described in the following section.
To build OpenSSL using Cygwin, you need to:
* Install Cygwin (see http://cygwin.com/)
* Install Perl and ensure it is in the path. Both Cygwin perl
(5.6.1-2 or newer) and ActivePerl work.
* Run the Cygwin bash shell
Apart from that, follow the Unix instructions in INSTALL.
NOTE: "make test" and normal file operations may fail in directories
mounted as text (i.e. mount -t c:\somewhere /home) due to Cygwin
stripping of carriage returns. To avoid this ensure that a binary
mount is used, e.g. mount -b c:\somewhere /home.
GNU C (MinGW/MSYS)
-------------
* Compiler and shell environment installation:
MinGW and MSYS are available from http://www.mingw.org/, both are
required. Run the installers and do whatever magic they say it takes
to start MSYS bash shell with GNU tools on its PATH.
Alternativelly, one can use MSYS2 from http://msys2.github.io/,
which includes MingW (32-bit and 64-bit).
* It is also possible to cross-compile it on Linux by configuring
with './Configure --cross-compile-prefix=i386-mingw32- mingw ...'.
Other possible cross compile prefixes include x86_64-w64-mingw32-
and i686-w64-mingw32-.
Linking your application
------------------------
If you link with static OpenSSL libraries then you're expected to
additionally link your application with WS2_32.LIB, ADVAPI32.LIB,
GDI32.LIB and USER32.LIB. Those developing non-interactive service
applications might feel concerned about linking with the latter two,
as they are justly associated with interactive desktop, which is not
available to service processes. The toolkit is designed to detect in
which context it's currently executed, GUI, console app or service,
and act accordingly, namely whether or not to actually make GUI calls.
Additionally those who wish to /DELAYLOAD:GDI32.DLL and /DELAYLOAD:USER32.DLL
and actually keep them off service process should consider
implementing and exporting from .exe image in question own
_OPENSSL_isservice not relying on USER32.DLL.
E.g., on Windows Vista and later you could:
__declspec(dllexport) __cdecl BOOL _OPENSSL_isservice(void)
{ DWORD sess;
if (ProcessIdToSessionId(GetCurrentProcessId(),&sess))
return sess==0;
return FALSE;
}
If you link with OpenSSL .DLLs, then you're expected to include into
your application code small "shim" snippet, which provides glue between
OpenSSL BIO layer and your compiler run-time. See the OPENSSL_Applink
manual page for further details.
"Classic" builds (Visual C++)
----------------
[OpenSSL was classically built using a script called mk1mf. This is
still available by configuring with --classic. The notes below are
using this flag, and are tentative. Use with care.
NOTE: this won't be available for long.]
If you want to compile in the assembly language routines with Visual
C++, then you will need the Netwide Assembler binary, nasmw.exe or nasm.exe, to
be available on your %PATH%.
Firstly you should run Configure and generate the Makefiles. If you don't want
the assembly language files then add the "no-asm" option (without quotes) to
the Configure lines below.
For Win32:
> perl Configure VC-WIN32 --classic --prefix=c:\some\openssl\dir
> ms\do_nasm
Note: replace the last line above with the following if not using the assembly
language files:
> ms\do_ms
For Win64/x64:
> perl Configure VC-WIN64A --classic --prefix=c:\some\openssl\dir
> ms\do_win64a
For Win64/IA64:
> perl Configure VC-WIN64I --classic --prefix=c:\some\openssl\dir
> ms\do_win64i
Where the prefix argument specifies where OpenSSL will be installed to.
Then from the VC++ environment at a prompt do the following. Note, your %PATH%
and other environment variables should be set up for 32-bit or 64-bit
development as appropriate.
> nmake -f ms\ntdll.mak
If all is well it should compile and you will have some DLLs and
executables in out32dll. If you want to try the tests then do:
> nmake -f ms\ntdll.mak test
To install OpenSSL to the specified location do:
> nmake -f ms\ntdll.mak install
Tweaks:
There are various changes you can make to the Windows compile
environment. By default the library is not compiled with debugging
symbols. If you add --debug to the Configure lines above then debugging symbols
will be compiled in.
By default in 1.1.0 OpenSSL will compile builtin ENGINES into separate shared
libraries. If you specify the "enable-static-engine" option on the command line
to Configure the shared library build (ms\ntdll.mak) will compile the engines
into libcrypto32.dll instead.
You can also build a static version of the library using the Makefile
ms\nt.mak
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