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build: prepare builds for clang-cl, add cmake ossfuzz support
- cmake: add support to build ossfuzz. Enable with `-DBUILD_OSSFUZZ=ON`. Also supports `-DLIB_FUZZING_ENGINE=` like autotools does. - check for `__clang__` when suppressing warnings in source. Necessary for clang-cl, which set `__clang__`, but doesn't set `__GNU__`. - cmake: optimize out 4 picky warning option detections with gcc. - cmake: bring `-pedantic-error`, `-Wall` use closer to curl's. - cmake: set `-Wno-language-extension-token` for clang-cl. - cmake: escape only the necessary `-W` options for clang-cl. - cmake: apply picky warnings to C++. - cmake: replace `unset(VAR)` with `set(VAR "")` for init. - cmake: prefer dash-style MSVC options. - cmake: simplify `MATCHES` expression. - cmake: formatting/whitespace. - ci/GHA: bump `actions/upload-artifact` to v4 Closes #1524
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@ -47,12 +47,12 @@ static int waitsocket(libssh2_socket_t socket_fd, LIBSSH2_SESSION *session)
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FD_ZERO(&fd);
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#if defined(__GNUC__)
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#if defined(__GNUC__) || defined(__clang__)
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#endif
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FD_SET(socket_fd, &fd);
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#if defined(__GNUC__)
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#if defined(__GNUC__) || defined(__clang__)
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#pragma GCC diagnostic pop
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#endif
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