Remove use of an old hack that takes advantage of the auto-dereference
behavior of the if() command to detect if a variable is defined.  The
hack has the form:

 if("${VAR} MATCHES "^${VAR}$")

where "${VAR}" is a macro argument reference.  Use if(DEFINED) instead.
This also avoids warnings for CMake Policy CMP0054 in CMake 3.1.

Revert commit 2257deb5 (Cmake: Avoid cycle directory dependencies,
2014-08-22) and add a comment explaining the purpose of the original
code.

The check_library_exists_concat macro is intended to be called multiple
times on a sequence of possibly dependent libraries.  Later libraries
may depend on earlier libraries when they are static.  They cannot be
safely linked in reverse order on some platforms.

Signed-off-by: Brad King <brad.king@kitware.com>

Revert commit 1269df2e (Cmake: Don't check for all headers each
time, 2014-08-15) and add a comment explaining the purpose of the
original code.

The check_include_file_concat macro is intended to be called multiple
times on a sequence of possibly dependent headers.  Later headers
may depend on earlier headers to provide declarations.  They cannot
be safely included independently on some platforms.

For example, many POSIX APIs document including sys/types.h before some
other headers.  Also on some OS X versions sys/socket.h must be included
before net/if.h or the check for the latter will fail.

Signed-off-by: Brad King <brad.king@kitware.com>

Otherwise Curl_gethostname always fails. Windows has gethostname
since Vista according to
http://msdn.microsoft.com/en-us/library/ms738527%28VS.85%29.aspx

, but
accordings to byte_bucket's VC 2005 documentation, it is available even
in Windows 95. (possibly after installing a Platform SDK, the
Windows Server 2003 SP1 Platform SDK should be sufficient).

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

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>

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>

This patch cleans up the automatically-generated (?) code and fixes one
case that will always fail due to syntax error.

HAVE_GETHOSTBYADDR_R_5_REENTRANT always failed because of a trailing
character ("int length;q"). Several parameter type and unused variable
warnings popped up. This causes a detection failure with -Werror.

Observe that the REENTRANT cases are exactly the same as their
non-REENTRANT cases except for a `_REENTRANT` macro definition.
Merge all these pieces and build one big main function with different
cases, but reusing variables where logical.

For the cases where the parameters where NULL, I looked at
lib/hostip4.c to get an idea of the parameters types.

void-cast variables such as 'rc' to avoid -Wuninitialized errors.

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

autotools does not use features.h nor _BSD_SOURCE. As this macro
triggers warnings since glibc 2.20, remove it. It should not have
functional differences.

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

It tries hard to recognise SDK's on different platforms. On windows MIT
Kerberos installs SDK with other things and puts path into registry.
Heimdal have separate zip archive. On linux pkg-config is tried, then
krb5-config script and finally old-style libs and headers detection.

Command line args:
* CMAKE_USE_GSSAPI - enables GSSAPI detection
* GSS_ROOT_DIR - if set, should point to the root of GSSAPI installation
                 (the one with include and lib directories)

Because we prepended libraries to list, CMake had troubles resolving
link directory order as it detected some cycles. Appending to list ensures
that dependencies will preceed dependees.

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.

They are unnecesary in modern CMake and removing them improves readability.

Undefined variables resolve to empty strings and we do not ever test if
the variable is defined thus those SETs are superfluous.

One header at a time is the right way. Apart from that the output on
windows goes from:
...
-- Looking for include files I:/src/libssh2-1.4.3/include/libssh2.h, ws2tcpip.h
-- Looking for include files I:/src/libssh2-1.4.3/include/libssh2.h, ws2tcpip.h
- found
-- Looking for 3 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wins
ock2.h
-- Looking for 3 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wins
ock2.h - found
-- Looking for 4 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., stdi
o.h
-- Looking for 4 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., stdi
o.h - found
-- Looking for 5 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wind
ows.h
-- Looking for 5 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wind
ows.h - found
-- Looking for 6 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wins
ock.h
-- Looking for 6 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., wins
ock.h - found
-- Looking for 7 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., sys/
filio.h
-- Looking for 7 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., sys/
filio.h - not found
-- Looking for 7 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., sys/
ioctl.h
-- Looking for 7 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., sys/
ioctl.h - not found
-- Looking for 7 include files I:/src/libssh2-1.4.3/include/libssh2.h, ..., sys/
resource.h
...

To much nicer:
...
-- Looking for ws2tcpip.h
-- Looking for ws2tcpip.h - found
-- Looking for winsock2.h
-- Looking for winsock2.h - found
-- Looking for stdio.h
-- Looking for stdio.h - found
-- Looking for windows.h
-- Looking for windows.h - found
-- Looking for winsock.h
-- Looking for winsock.h - found
-- Looking for sys/filio.h
-- Looking for sys/filio.h - not found
-- Looking for sys/ioctl.h
-- Looking for sys/ioctl.h - not found
-- Looking for sys/resource.h

CMake 2.6 is already a bit old. Many bugs have been fixed since
its release. We use 2.8 in our company and we have no intention
of polluting our environment with old software, so 2.6 would
not be tested. This shouldn't be a problem since all one need
to build CMake from source is C and C++ compiler.

Patch-by: "Z98"

All C and H files now (should) feature the proper project curl source
code header, which includes basic info, a copyright statement and some
basic disclaimers.

The CheckTypeSize module that comes with CMake 2.6.2 and above does
everything we need and also supports cross-compiling.  Avoid duplicating
an older version of it here.  This also fixes a cross-compiling error
because the old line

  include ("${CMAKE_MODULE_PATH}/CheckTypeSize.cmake")

failed because CMAKE_MODULE_PATH is a search path and not a directory.

Signed-off-by: Brad King <brad.king@kitware.com>

Make sure <sys/socket.h> is included if around when testing/using
socklen_t.  Also, disable LDAP if LDAP_H is not found on the system.

replaced tabs with spaces

removed trailing whitespace

BUG: curl did not build with cmake with VS 2005 for two reasons, ws2tcpip.h requires winsock2.h to be included before it with that compiler, and wldap32 is not available with the default install of the compiler, so disable ldap support if that is not found

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