Statically linking ngtcp2 and quictls/openssl on Windows

[jixinqi]

I did this

To compile curl on Windows with MSVC and statically link all dependencies, I used these steps:

1. Build quictls/openssl

Build Command:

git reset --hard
git clean -fdx
perl Configure VC-WIN64A Debug no-shared \
    --prefix=[path to ssl install] \
    --openssldir=[path to ssl install]/ssl
perl configdata.pm --dump
nmake
nmake test
nmake install

2. Build ngtcp2

Build Command:

cmake -B build/ngtcp2
    -DCMAKE_INSTALL_PREFIX=[path to ngtcp2 install]
    -DCMAKE_BUILD_TYPE=DEBUG
    -DENABLE_OPENSSL=ON
    -DOPENSSL_ROOT_DIR=[path to ssl install]
    -DLIBNGHTTP3_INCLUDE_DIR=[path to libngtcp3 install]/include
    -DLIBNGHTTP3_LIBRARY=[path to libngtcp3 install]/lib
    -DENABLE_STATIC_LIB=ON
    -DENABLE_SHARED_LIB=OFF
    -DBUILD_TESTING=OFF
cmake --build   [path to ngtcp2 install] --config=DEBUG
cmake --install [path to ngtcp2 install] --config=DEBUG

3. Build curl

Build Command:

cmake -B [path to curl install]
    -DCMAKE_INSTALL_PREFIX=    [path to curl install] \
    -DCMAKE_BUILD_TYPE=        Debug \
    -DBUILD_SHARED_LIBS=       OFF \
    -DBUILD_STATIC_LIBS=       ON \
    -DBUILD_TESTING=           OFF \

    -DCURL_CA_BUNDLE=          "./cacert.pem_path" \
    -DCURL_USE_OPENSSL=        ON \
    -DOPENSSL_ROOT_DIR=        [path to ssl install] \

    -DCURL_USE_LIBPSL=         ON \
    -DLIBPSL_INCLUDE_DIR=      [path to libpsl install]/include \
    -DLIBPSL_LIBRARY=          [path to libpsl install]/lib/psl.lib \
    -DLIBPSL_CFLAGS=           -DPSL_API= \

    -DNGHTTP3_INCLUDE_DIR=     [path to nghttp3 install]/include \
    -DNGHTTP3_LIBRARY=         [path to nghttp3 install]/lib/nghttp3.lib \
    -DNGHTTP3_CFLAGS=          -DNGHTTP3_STATICLIB= \

    -DUSE_NGTCP2=              ON \
    -DNGTCP2_INCLUDE_DIR=      [path to ngtcp2 install]/include \
    -DNGTCP2_LIBRARY=          [path to ngtcp2 install]/lib/ngtcp2.lib \
    -DNGTCP2_CFLAGS=           -DNGTCP2_STATICLIB=

Issue Explanation

The curl_openssl_check_quic function in CMakeLists.txt fails during compilation because crypt32.lib is not linked. This occurs when:

ngtcp2 and curl are both statically linked to quictls/openssl.
Static linking does not automatically resolve Windows-specific dependencies like crypt32, which provides cryptographic APIs (e.g. SSL_set_quic_use_legacy_codepoint)

I fixed this probrem:

Commit: jixinqi@f9252a6

I expected the following

No response

curl/libcurl version

PS Z:\curl-builder> Z:\curl-builder__install\curl\Debug\bin\curl.exe -V
curl 8.13.1-DEV (Windows) libcurl/8.13.1-DEV quictls/3.1.7 zlib/1.3.1.1-motley libpsl/0.21.5 nghttp2/1.65.90 ngtcp2/1.11.90 nghttp3/1.8.90
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns ldap ldaps mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp ws wss
Features: alt-svc AsynchDNS HSTS HTTP2 HTTP3 HTTPS-proxy IPv6 Largefile libz NTLM PSL SSL threadsafe TLS-SRP UnixSockets

operating system

windows 11

[vszakats]

@jixinqi Does this patch fixes the issue for you?: #17102

[jixinqi]

@vszakats Yes, it works very well.