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build: prepare builds for clang-cl, add cmake ossfuzz support

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- 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
This commit is contained in:
Viktor Szakats
2024-10-30 00:59:03 +01:00
parent af5c9fb88f
commit 854cfa8292
22 changed files with 158 additions and 131 deletions
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8
example/x11.c
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@ -210,12 +210,12 @@ static int x11_send_receive(LIBSSH2_CHANNEL *channel, libssh2_socket_t sock)
timeval_out.tv_usec = 0;
FD_ZERO(&set);
#if defined(__GNUC__)
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
FD_SET(sock, &set);
#if defined(__GNUC__)
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop
#endif
@ -415,12 +415,12 @@ int main(int argc, char *argv[])
for(;;) {
FD_ZERO(&set);
#if defined(__GNUC__)
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wsign-conversion"
#endif
FD_SET(fileno(stdin), &set);
#if defined(__GNUC__)
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic pop
#endif