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@@ -0,0 +1,103 @@
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+From 73f6f8ebff678a0847e6b197b574082cc285b528 Mon Sep 17 00:00:00 2001
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+From: Thomas Klausner <tk@giga.or.at>
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+Date: Sat, 25 Jul 2020 12:03:29 +0200
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+Subject: [PATCH] Add FindGnuTLS.cmake from 3.17.3.
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+
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+Addresses #199
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+
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+[Retrieved from:
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+https://github.com/nih-at/libzip/commit/73f6f8ebff678a0847e6b197b574082cc285b528]
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+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
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+---
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+ cmake-compat/FindGnuTLS.cmake | 82 +++++++++++++++++++++++++++++++++++
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+ 1 file changed, 82 insertions(+)
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+ create mode 100644 cmake-compat/FindGnuTLS.cmake
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+
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+diff --git a/cmake-compat/FindGnuTLS.cmake b/cmake-compat/FindGnuTLS.cmake
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+new file mode 100644
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+index 00000000..819f0001
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+--- /dev/null
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++++ b/cmake-compat/FindGnuTLS.cmake
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+@@ -0,0 +1,82 @@
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++# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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++# file Copyright.txt or https://cmake.org/licensing for details.
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++
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++#[=======================================================================[.rst:
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++FindGnuTLS
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++----------
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++
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++Find the GNU Transport Layer Security library (gnutls)
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++
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++IMPORTED Targets
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++^^^^^^^^^^^^^^^^
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++
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++This module defines :prop_tgt:`IMPORTED` target ``GnuTLS::GnuTLS``, if
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++gnutls has been found.
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++
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++Result Variables
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++^^^^^^^^^^^^^^^^
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++
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++``GNUTLS_FOUND``
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++ System has gnutls
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++``GNUTLS_INCLUDE_DIR``
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++ The gnutls include directory
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++``GNUTLS_LIBRARIES``
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++ The libraries needed to use gnutls
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++``GNUTLS_DEFINITIONS``
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++ Compiler switches required for using gnutls
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++``GNUTLS_VERSION``
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++ version of gnutls.
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++#]=======================================================================]
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++
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++# Note that this doesn't try to find the gnutls-extra package.
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++
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++
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++if (GNUTLS_INCLUDE_DIR AND GNUTLS_LIBRARY)
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++ # in cache already
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++ set(gnutls_FIND_QUIETLY TRUE)
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++endif ()
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++
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++if (NOT WIN32)
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++ # try using pkg-config to get the directories and then use these values
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++ # in the find_path() and find_library() calls
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++ # also fills in GNUTLS_DEFINITIONS, although that isn't normally useful
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++ find_package(PkgConfig QUIET)
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++ PKG_CHECK_MODULES(PC_GNUTLS QUIET gnutls)
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++ set(GNUTLS_DEFINITIONS ${PC_GNUTLS_CFLAGS_OTHER})
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++ set(GNUTLS_VERSION ${PC_GNUTLS_VERSION})
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++ # keep for backward compatibility
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++ set(GNUTLS_VERSION_STRING ${PC_GNUTLS_VERSION})
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++endif ()
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++
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++find_path(GNUTLS_INCLUDE_DIR gnutls/gnutls.h
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++ HINTS
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++ ${PC_GNUTLS_INCLUDEDIR}
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++ ${PC_GNUTLS_INCLUDE_DIRS}
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++ )
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++
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++find_library(GNUTLS_LIBRARY NAMES gnutls libgnutls
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++ HINTS
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++ ${PC_GNUTLS_LIBDIR}
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++ ${PC_GNUTLS_LIBRARY_DIRS}
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++ )
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++
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++mark_as_advanced(GNUTLS_INCLUDE_DIR GNUTLS_LIBRARY)
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++
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++include(${CMAKE_CURRENT_LIST_DIR}/FindPackageHandleStandardArgs.cmake)
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++FIND_PACKAGE_HANDLE_STANDARD_ARGS(GnuTLS
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++ REQUIRED_VARS GNUTLS_LIBRARY GNUTLS_INCLUDE_DIR
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++ VERSION_VAR GNUTLS_VERSION_STRING)
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++
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++if(GNUTLS_FOUND)
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++ set(GNUTLS_LIBRARIES ${GNUTLS_LIBRARY})
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++ set(GNUTLS_INCLUDE_DIRS ${GNUTLS_INCLUDE_DIR})
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++
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++ if(NOT TARGET GnuTLS::GnuTLS)
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++ add_library(GnuTLS::GnuTLS UNKNOWN IMPORTED)
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++ set_target_properties(GnuTLS::GnuTLS PROPERTIES
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++ INTERFACE_INCLUDE_DIRECTORIES "${GNUTLS_INCLUDE_DIRS}"
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++ INTERFACE_COMPILE_DEFINITIONS "${GNUTLS_DEFINITIONS}"
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++ IMPORTED_LINK_INTERFACE_LANGUAGES "C"
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++ IMPORTED_LOCATION "${GNUTLS_LIBRARIES}")
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++ endif()
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++endif()
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Fabrice Fontaine