compat.openssl

// compat.openssl end-to-end: headers resolve, both archives link, and the
// library initialises far enough to stand up a TLS context and run a digest.
//
// Touching BOTH archives is the point: libssl.a (SSL_CTX_new, TLS_method) and
// libcrypto.a (EVP_*). A link that silently dropped one, or picked up a host
// libssl.so instead of the package's own static build, fails here.
//
// HAVE_OPENSSL comes from this project's own cfg-gated cxxflags — the package
// is linux/macOS-only, so elsewhere this file is an empty main().
#ifdef HAVE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/evp.h>
#include <openssl/opensslv.h>

#include <cstring>

int main() {
    // Built from the 3.5.1 tarball this descriptor pins.
    if (OPENSSL_VERSION_MAJOR != 3 || OPENSSL_VERSION_MINOR != 5) return 1;

    // libssl: a usable client context.
    SSL_CTX* ctx = SSL_CTX_new(TLS_client_method());
// …