curl/CMake/FindLibSSH2.cmake
Rolf Eike Beer fc9312f717 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
2020-02-29 23:14:16 -05:00

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CMake

# - Try to find the libssh2 library
# Once done this will define
#
# LIBSSH2_FOUND - system has the libssh2 library
# LIBSSH2_INCLUDE_DIR - the libssh2 include directory
# LIBSSH2_LIBRARY - the libssh2 library name
find_path(LIBSSH2_INCLUDE_DIR libssh2.h)
find_library(LIBSSH2_LIBRARY NAMES ssh2 libssh2)
if(LIBSSH2_INCLUDE_DIR)
file(STRINGS "${LIBSSH2_INCLUDE_DIR}/libssh2.h" libssh2_version_str REGEX "^#define[\t ]+LIBSSH2_VERSION[\t ]+\"(.*)\"")
string(REGEX REPLACE "^.*\"([^\"]+)\"" "\\1" LIBSSH2_VERSION "${libssh2_version_str}")
endif()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(LibSSH2
REQUIRED_VARS LIBSSH2_LIBRARY LIBSSH2_INCLUDE_DIR
VERSION_VAR LIBSSH2_VERSION)
mark_as_advanced(LIBSSH2_INCLUDE_DIR LIBSSH2_LIBRARY)