Revert "build: remove checks for WinSock 1"

Due to CI issues

This reverts commit c2ea04f92b00b6271627cb218647527b5a50f2fc.

Closes #7790

build: remove checks for WinSock 1

It's not supported anymore.

Closes https://github.com/curl/curl/pull/7778

cmake: avoid poll() on macOS

... like we do in configure builds. Since poll() on macOS is not
reliable enough.

Reported-by: marc-groundctl
Fixes #7595
Closes #7619

Get rid of the unused HAVE_SIG_ATOMIC_T et. al.

It was added in 2006 but I see no evidence it was ever used.

misc: copyright year range updates

cmake: try well-known send/recv signature for Apple

The CMake `try_compile` command is especially slow for
the Xcode generator. With this patch applied it first tests
for the current

cmake: try well-known send/recv signature for Apple

The CMake `try_compile` command is especially slow for
the Xcode generator. With this patch applied it first tests
for the currently used (and Open Group specified) send/recv
signature. In case this fails testing falls-back to the
permutations.

speed-up:

```
time cmake .. -GNinja -DCMAKE_USE_SECTRANSP=ON -DHTTP_ONLY=ON -DCMAKE_USE_LIBSSH2=OFF
before: 11.64s user 11.09s system 55% cpu 40.754 total
after: 7.84s user 6.57s system 51% cpu 28.074 total
```

```
time cmake .. -GXcode -DCMAKE_USE_SECTRANSP=ON -DHTTP_ONLY=ON -DCMAKE_USE_LIBSSH2=OFF
before: 217.07s user 104.15s system 60% cpu 8:51.79 total
after: 108.76s user 51.80s system 58% cpu 4:32.58 total
```

Closes #7158

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curl.se: new home

Closes #6172

cmake: Avoid MSVC C4273 warnings in send/recv checks

We use `check_c_source_compiles` to check possible send/recv signatures
by reproducing the forward declarations from system headers.

cmake: Avoid MSVC C4273 warnings in send/recv checks

We use `check_c_source_compiles` to check possible send/recv signatures
by reproducing the forward declarations from system headers. On Windows
the `winsock2.h` header adds dll linkage settings to its forward
declaration. If ours does not match the compiler warns:

warning C4273: 'recv': inconsistent dll linkage

Add `WINSOCK_API_LINKAGE` to our test signatures when it is defined so
that our linkage is consistent with that from `winsock2.h`.

Fixes #4764
Closes #5232

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copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyrigh

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

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CMake: clean up and improve build procedures

- remove check for unsupported old CMake versions

- do not link to c-ares library twice

- modernize custom Find modules

CMake: clean up and improve build procedures

- remove check for unsupported old CMake versions

- do not link to c-ares library twice

- modernize custom Find modules

- FindLibSSH2:
- pass version to FPHSA to show it in the output
- use LIBSSH2_VERSION define to extract the version number in
one shot. This variable exists in the header for 10 years.
- remove unneeded code

- FindNGHTTP2.cmake:
- drop needless FPHSA argument
- mark found variables as advanced

- FindNSS.cmake:
- show version number

- FindCARES.cmake:
- drop default paths
- use FPHSA instead of checking things by hand

- remove needless explict variable dereference

- simplify count_true()

- allow all policies up to version 3.16 to be set to NEW

- do not rerun check for -Wstrict-aliasing=3 every time

In contrast to every other compiler flag this has a = in it, which CMake
can't have in a variable name.

- only read the interesting strings from curlver.h

Reviewed-by: Peter Wu

Closes https://github.com/curl/curl/pull/4975

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cmake: avoid linking executable for some tests with cmake 3.6+

With CMAKE_TRY_COMPILE_TARGET_TYPE set to STATIC_LIBRARY, the try_compile()
(which is used by check_c_source_compiles()) wi

cmake: avoid linking executable for some tests with cmake 3.6+

With CMAKE_TRY_COMPILE_TARGET_TYPE set to STATIC_LIBRARY, the try_compile()
(which is used by check_c_source_compiles()) will build static library
instead of executable. This avoids linking additional libraries in and thus
speeds up those checks a little.

This commit also avoids #3743 (GSSAPI build errors) on itself with cmake
3.6 or above. That issue was fixed separately for all versions.

Ref: #3744

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cmake: updated check for HAVE_POLL_FINE to match autotools

CMake: remove redundant and old end-of-block syntax

Reviewed-by: Jakub Zakrzewski
Closes #2715

cmake: fix send/recv argument scanner for windows

... by simply trying the Windows argument types first.

Fixes #1640

cmake: disable poll for macOS

Mirrors the autotools behavior introduced with curl-7_50_3-83-ga34c7ce.

Fixes #1089

CMake: Put "winsock2.h" before "windows.h" during configure checks

"windows.h" includes "winsock.h" what causes many redefinition errors
if "winsock2.h" is included afterwards and can ca

CMake: Put "winsock2.h" before "windows.h" during configure checks

"windows.h" includes "winsock.h" what causes many redefinition errors
if "winsock2.h" is included afterwards and can cause build to fail.

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cmake: fix struct sockaddr_storage check

CHECK_TYPE_SIZE_PREINCLUDE is an internal, undocumented variable which
was removed in cmake 2.8.1. According to the MSDN docs[1], inclusion
o

cmake: fix struct sockaddr_storage check

CHECK_TYPE_SIZE_PREINCLUDE is an internal, undocumented variable which
was removed in cmake 2.8.1. According to the MSDN docs[1], inclusion
of winsock2.h is sufficient. WIN32_LEAN_AND_MEAN does not really seem
to affect the tests, so remove it too[2].

For the non-windows case, remove inet headers as POSIX only requires
sys/socket.h.

[1]: http://msdn.microsoft.com/en-us/library/windows/desktop/ms740504%28v=vs.85%29.aspx
[2]: http://stackoverflow.com/questions/11040133/what-does-defining-win32-lean-and-mean-exclude-exactly

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

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cmake: clean OtherTests, fixing -Werror

There were several -Wunused warnings and one duplicate macro definition.
The EXTRA_DEFINES variable of the CurlCheckCSources macro was being
a

cmake: clean OtherTests, fixing -Werror

There were several -Wunused warnings and one duplicate macro definition.
The EXTRA_DEFINES variable of the CurlCheckCSources macro was being
abused ("__unused1\n#undef inline\n#define __unused2", seriously?) to
insert extra C code. Avoid this broken abstraction and use cmake's
check_c_source_compiles directly (works fine with CMake 2.8, maybe
even cmake 2.6).

After cleaning up all related variables (EXTRA_DEFINES,
HEADER_INCLUDES, auxiliary headers_hack), also remove a duplicate
add_headers_include macro and remove duplicate header additions before
the struct timeval check.

Oh, and now the code is converted to use CheckCSourceRuns and
CheckCSourceCompiles, the two curl-specific helpers can be removed.
Unfortunately, the cmake output is now slightly more verbose. Before:

Performing Test int send(int, const void *, size_t, int) (curl_cv_func_send_test)
Performing Test int send(int, const void *, size_t, int) (curl_cv_func_send_test) - Failed

Since check_c_source_compiles prints the varname, now you see:

Performing Test curl_cv_func_send_test
Performing Test curl_cv_func_send_test - Failed
Tested: int send(int, const void *, size_t, int)

Compared cmake output with each other using vimdiff, no functional
differences were found. Tested with GCC 4.9.1 and Clang 3.5.0.

Signed-off-by: Peter Wu <peter@lekensteyn.nl>

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Cmake: Possibility to use OpenLDAP, OpenSSL, LibSSH2 on windows

At this point I can build libcurl on windows. It provides at least the same
list of protocols as for linux build and works

Cmake: Possibility to use OpenLDAP, OpenSSL, LibSSH2 on windows

At this point I can build libcurl on windows. It provides at least the same
list of protocols as for linux build and works with our software.

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removed trailing whitespace

ENH: lower case cmake functions and remove tabs and re-indent cmake code

Initial CMake scripts (libcurl only), based on the merge of tetest scripts and mine. These are far to be functionnal yet.
PS: Hello world :)