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04ecdb22fe
- sync picky compiler warning options with curl: - update version mappings for latest Apple clang. - replace `-pedantic` with `-Wpedantic` on newer toolchains. - adjust warning cutoff versions. - enable new picky warnings. - unlock picky warnings for most recent MSVC. - GHA: bump some MSVC jobs to to VS2026. Fix fallouts: - configure: replace `-I` with `-isystem` for dependency headers. Notably it silences picky warnings otherwise found in 3rd-party headers, e.g. `-Wreserved-identifier` in `gpg-error.h`, `openssl/lhash.h`, `wolfssl/wolfcrypt/hmac.h`, or `-Wcast-function-type-strict` in `openssl/rsa.h`. It also aligns autotools builds with CMake (and curl builds). Logic copied from curl. - example/x11: fix to not use reserved symbols. - include, src/libssh2_priv.h: silence `-Wreserved-identifier` locally. May be fixed for real in a future patch. - avoid using reserved C++ keyword `public`. - openssl: silence `-Wcast-function-type-strict` locally for non-OpenSSL3 builds. - mbedtls, openssl: fix potentially uninitialized variable warnings. (extend to all compilers from MSVC in openssl) - fix `LIBSSH2_SOCKET_MASK` signedness on Windows. - wincng: apply casts from `int` to `enum` to silence `-Wimplicit-int-enum-cast`. - configure: disable `-Wleading-whitespace=spaces` to due incompatibility with `AC_FUNC_ALLOCA`. - packet: fix to pass `int` as mask length. - fix `-Wformat-signedness`. - src/libssh2_priv.h: silence `-Wreserved-macro-identifier` locally for mingw-w64 builds. - GHA: add workaround for missing NSIS on windows-2025 runner images. Closes #1972