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`HAVE_SIGNAL` means the availability of the `signal()` function in
autotools, while in CMake it meant the availability of that function
_and_ the symbol `SIGALRM`.
The latter is not available on Windows, but the function is, which means
on Windows, autotools did define `HAVE_SIGNAL`, but CMake did not,
introducing a slight difference into the binaries.
This patch syncs CMake behaviour with autotools to look for the function
only.
The logic came with the initial commit adding CMake support to curl, so
the commit history doesn't reveal the reason behind it. In any case,
it's best to check the existence of `SIGALRM` directly in the source
before use. For now, curl builds fine with `HAVE_SIGNAL` enabled and
`SIGALRM` missing.
Follow-up to
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|---|---|---|
| .. | ||
| Platforms | ||
| cmake_uninstall.cmake.in | ||
| CMakeConfigurableFile.in | ||
| curl-config.cmake.in | ||
| CurlSymbolHiding.cmake | ||
| CurlTests.c | ||
| FindBearSSL.cmake | ||
| FindBrotli.cmake | ||
| FindCARES.cmake | ||
| FindGSS.cmake | ||
| FindLibPSL.cmake | ||
| FindLibSSH2.cmake | ||
| FindMbedTLS.cmake | ||
| FindMSH3.cmake | ||
| FindNGHTTP2.cmake | ||
| FindNGHTTP3.cmake | ||
| FindNGTCP2.cmake | ||
| FindNSS.cmake | ||
| FindQUICHE.cmake | ||
| FindWolfSSL.cmake | ||
| FindZstd.cmake | ||
| Macros.cmake | ||
| OtherTests.cmake | ||
| Utilities.cmake | ||