[question] Compiling OpenSSL with MinGW on Windows

How can I compile OpenSSL with conan and MinGW 8.2 on Windows 10?

I’m using MinGW 8.2.0 from STL compilation and conan 1.20.1 on Windows 10.

I’m trying to install websocketpp that has OpenSSL 1.1.1c as dependency. Console outputs the following:

PS C:\Users\User\Documents\Sources\MRT\Development> conan install . --build=missing
Configuration:
[settings]
arch=x86_64
arch_build=x86_64
build_type=Release
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=8.2
os=Windows
os_build=Windows
[options]
[build_requires]
[env]

WARN: websocketpp/0.8.1@bincrafters/stable: requirement asio/1.12.0@bincrafters/stable overridden by your conanfile to asio/1.13.0@bincrafters/stable
OpenSSL/1.1.1c@conan/stable: Not found in local cache, looking in remotes...
OpenSSL/1.1.1c@conan/stable: Trying with 'conan-center'...
Downloading conanmanifest.txt: 100%|##########| 58.0/58.0 [00:00<00:00, 17.7kB/s]
Downloading conanfile.py: 100%|##########| 28.7k/28.7k [00:00<00:00, 111kB/s]
OpenSSL/1.1.1c@conan/stable: Downloaded recipe revision 0
conanfile.txt: Installing package
Requirements
    OpenSSL/1.1.1c@conan/stable from 'conan-center' - Downloaded
    asio/1.13.0@bincrafters/stable from 'conan-center' - Cache
    fmt/6.0.0@bincrafters/stable from 'conan-center' - Cache
    paho-c/1.3.0@conan/stable from 'conan-center' - Cache
    pugixml/1.10@bincrafters/stable from 'conan-center' - Cache
    rapidjson/1.1.0@bincrafters/stable from 'conan-center' - Cache
    spdlog/1.4.2@bincrafters/stable from 'conan-center' - Cache
    sqlite3/3.29.0 from 'conan-center' - Cache
    websocketpp/0.8.1@bincrafters/stable from 'bincrafters' - Cache
    zlib/1.2.11@conan/stable from 'conan-center' - Cache
Packages
    OpenSSL/1.1.1c@conan/stable:0fa24fc17987c7ebda4490aaf810b500f741dab6 - Build
    asio/1.13.0@bincrafters/stable:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    fmt/6.0.0@bincrafters/stable:d2e9f0427a9f423abdfdcd9fc1fca32c78f3be27 - Cache
    paho-c/1.3.0@conan/stable:11970fe766f2003618a4453bd3b5a3990f025a65 - Cache
    pugixml/1.10@bincrafters/stable:d2e9f0427a9f423abdfdcd9fc1fca32c78f3be27 - Cache
    rapidjson/1.1.0@bincrafters/stable:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Cache
    spdlog/1.4.2@bincrafters/stable:a1605c08cfb1e7a1f94058c08792d89866f7ebbd - Build
    sqlite3/3.29.0:8b8ab72be77c9228fea3280f90348dfbde80f9d0 - Cache
    websocketpp/0.8.1@bincrafters/stable:5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9 - Download
    zlib/1.2.11@conan/stable:e50fc893ef691a3c18ad21536d7cf203bc81bd95 - Cache
Build requirements
    nasm/2.13.01@conan/stable from 'conan-center' - Cache
Build requirements packages
    nasm/2.13.01@conan/stable:456f15897172eef340fcbac8a70811f2beb26a93 - Cache

asio/1.13.0@bincrafters/stable: Already installed!
fmt/6.0.0@bincrafters/stable: Already installed!
nasm/2.13.01@conan/stable: Already installed!
nasm/2.13.01@conan/stable: Using nasm-2.13.01 version
paho-c/1.3.0@conan/stable: Already installed!
pugixml/1.10@bincrafters/stable: Already installed!
rapidjson/1.1.0@bincrafters/stable: Already installed!
sqlite3/3.29.0: Already installed!
zlib/1.2.11@conan/stable: Already installed!
OpenSSL/1.1.1c@conan/stable: Applying build-requirement: nasm/2.13.01@conan/stable
OpenSSL/1.1.1c@conan/stable: Configuring sources in C:\Users\User\.conan\data\OpenSSL\1.1.1c\conan\stable\source
Downloading openssl-1.1.1c.tar.gz: 100%|##########| 8.45M/8.45M [00:20<00:00, 437kB/s]

OpenSSL/1.1.1c@conan/stable: Copying sources to build folder
OpenSSL/1.1.1c@conan/stable: Building your package in C:\Users\User\.conan\data\OpenSSL\1.1.1c\conan\stable\build\0fa24fc17987c7ebda4490aaf810b500f741dab6
OpenSSL/1.1.1c@conan/stable: Generator txt created conanbuildinfo.txt
OpenSSL/1.1.1c@conan/stable: Calling build()
OpenSSL/1.1.1c@conan/stable: using target: mingw-conan-Release-Windows-x86_64-gcc-8.2 -> mingw64
OpenSSL/1.1.1c@conan/stable: my %targets = (
    "mingw-conan-Release-Windows-x86_64-gcc-8.2" => {
        inherit_from => [ "mingw64" ],
        cflags => add("-m64 -O3 -s"),
        cxxflags => add("-m64 -O3 -s"),
        defines => add("NDEBUG"),
        includes => add("C:/Users/User/.conan/data/zlib/1.2.11/conan/stable/package/e50fc893ef691a3c18ad21536d7cf203bc81bd95/include"),
        lflags => add("-m64"),




    },
);

OpenSSL/1.1.1c@conan/stable: ['"mingw-conan-Release-Windows-x86_64-gcc-8.2"', 'no-shared', '--prefix=/c/users/user/.conan/data/openssl/1.1.1c/conan/stable/package/0fa24fc17987c7ebda4490aaf810b500f741dab6', '--openssldir=/c/users/user/.conan/data/openssl/1.1.1c/conan/stable/package/0fa24fc17987c7ebda4490aaf810b500f741dab6/res', 'no-unit-test', 'PERL=perl', 'no-tests', '--release', '--with-zlib-include="C:/Users/User/.conan/data/zlib/1.2.11/conan/stable/package/e50fc893ef691a3c18ad21536d7cf203bc81bd95/include"', '--with-zlib-lib="C:/Users/User/.conan/data/zlib/1.2.11/conan/stable/package/e50fc893ef691a3c18ad21536d7cf203bc81bd95/lib/zlib.lib"']
OpenSSL/1.1.1c@conan/stable:
OpenSSL/1.1.1c@conan/stable: ERROR: Package '0fa24fc17987c7ebda4490aaf810b500f741dab6' build failed
OpenSSL/1.1.1c@conan/stable: WARN: Build folder C:\Users\User\.conan\data\OpenSSL\1.1.1c\conan\stable\build\0fa24fc17987c7ebda4490aaf810b500f741dab6
ERROR: OpenSSL/1.1.1c@conan/stable: Error in build() method, line 552
        self._make()
while calling '_make', line 502
        self.run('{perl} ./Configure {args}'.format(perl=self._perl, args=args), win_bash=self._win_bash)
        ConanException: Cannot recognize the Windows subsystem, install MSYS2/cygwin or specify a build_require to apply it.
PS C:\Users\User\Documents\Sources\MRT\Development>

I have tried changing build_requires from default profile settings to use cygwin_installer/msys2_installer for OpenSSL only.

As shown here:

.conan/profiles/default:

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=gcc
compiler.libcxx=libstdc++11
compiler.version=8.2
build_type=Release
[options]
[build_requires]
#OpenSSL*: msys2_installer/20161025@bincrafters/stable
#OpenSSL*: cygwin_installer/2.9.0@bincrafters/stable
[env]

But I get some kind of error with some Win32API headers, I have attached a file with the output. cygwin output.txt

May I ask how can I use this package to be used with websocketpp?

[SSE4]

seems like similar to https://github.com/openssl/openssl/issues/2979

This happens if you attempt to build OpenSSL using the msys gcc compiler rather than the mingw compiler

so, it’s probably wrong GCC instance was picked up. could you try to specify CC/CXX environment variables within your profile pointing to the right GCC executables (from https://nuwen.net/mingw.html)

[leyewen]

NEW UPDATE: I deep research this issues. Finally, sum up the experience:

First, Cannot recognize the Windows subsystem, install MSYS2/cygwin :

ERROR: openssl/1.1.1d: Error in build() method, line 529
	self._make()
while calling '_make', line 477
	self.run('{perl} ./Configure {args}'.format(perl=self._perl, args=args), win_bash=self._win_bash)
	ConanException: Cannot recognize the Windows subsystem, install MSYS2/cygwin or specify a build_require to apply it.

add msys2 to conanfile.py

    def build_requirements(self):
        # useful for example for conditional build_requires
        if tools.os_info.is_windows:
            if not self._win_bash:
                self.build_requires("strawberryperl/5.30.0.1")
            if not self.options.no_asm and not tools.which("nasm"):
                self.build_requires("nasm/2.14")
            # add msys2 require
            if "CONAN_BASH_PATH" not in os.environ:
                self.build_requires("msys2/20190524")

We need msys2 support bash in windows.

Second, dso_win32 error: If use msys2/20190524 only environment will due to this error. Why is this happening? When use msys2, conanfile.py identify the system status as mingw64.

# line 174
is_cygwin = self.settings.get_safe("os.subsystem") == "cygwin" # default false
......
# line 226
"Windows-x86_64-gcc": "Cygwin-x86_64" if is_cygwin else "mingw64" # result mingw64

read https://mta.openssl.org/pipermail/openssl-commits/2015-March/000733.html openssl: Cygwin to use DSO_FLFCN and mingw to use DSO_WIN32. And msys2 is based on modern Cygwin. It recognized is_cygwin as false, but building with msys2(Cygwin) by using mingw64 mode!

1 option If only target msys2, you need to tell your profile use cygwin subsystem:

os.subsystem=cygwin

building with msys2 by using cygwin mode.

2 option Add mingw build_requires to your profile:

openssl/1.1.1d:msys2/20190524
openssl/1.1.1d:mingw_installer/1.0@conan/stable

or

openssl/1.1.1d:msys2/20190524, mingw_installer/1.0@conan/stable

building with mingw by using mingw mode.

3 option Use msys2 subsystem mingw64: msys2 install mingw-w64-x86_64-toolchain run C:\.conan\f16a5d\1\bin\msys2.exe pacman -S mingw-w64-x86_64-toolchain --noconfirm build profile add target toolchain=x86_64-w64-mingw32

toolchain=x86_64-w64-mingw32
target_host=x86_64-w64-mingw32
cc_compiler=gcc
cxx_compiler=g++

[env]
CONAN_CMAKE_FIND_ROOT_PATH=$toolchain
CC=$target_host-$cc_compiler
CXX=$target_host-$cxx_compiler

4 option Update is_cygwin logical judgment.

The above configurations have been tested.