1 files changed, 85 insertions, 0 deletions
diff --git a/cmake/Modules/FindFseeko.cmake b/cmake/Modules/FindFseeko.cmake
new file mode 100644
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+++ b/cmake/Modules/FindFseeko.cmake
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+# CMake support for fseeko
+#
+# Based on FindLFS.cmake by
+# Copyright (C) 2016 Julian Andres Klode <jak@debian.org>.
+#
+# Permission is hereby granted, free of charge, to any person
+# obtaining a copy of this software and associated documentation files
+# (the "Software"), to deal in the Software without restriction,
+# including without limitation the rights to use, copy, modify, merge,
+# publish, distribute, sublicense, and/or sell copies of the Software,
+# and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+# This defines the following variables
+#
+# FSEEKO_DEFINITIONS - List of definitions to pass to add_definitions()
+# FSEEKO_COMPILE_OPTIONS - List of definitions to pass to add_compile_options()
+# FSEEKO_LIBRARIES - List of libraries and linker flags
+# FSEEKO_FOUND - If there is Large files support
+#
+
+include(CheckCSourceCompiles)
+include(FindPackageHandleStandardArgs)
+include(CMakePushCheckState)
+
+# Check for the availability of fseeko()
+# The cases handled are:
+#
+#  * Native fseeko()
+#  * Preprocessor flag -D_LARGEFILE_SOURCE
+#
+function(_fseeko_check)
+    set(_fseeko_cppflags)
+    cmake_push_check_state()
+    set(CMAKE_REQUIRED_QUIET 1)
+    set(CMAKE_REQUIRED_DEFINITIONS ${LFS_DEFINITIONS})
+    message(STATUS "Looking for native fseeko support")
+    check_symbol_exists(fseeko stdio.h fseeko_native)
+    cmake_pop_check_state()
+    if (fseeko_native)
+        message(STATUS "Looking for native fseeko support - found")
+        set(FSEEKO_FOUND TRUE)
+    else()
+        message(STATUS "Looking for native fseeko support - not found")
+    endif()
+
+    if (NOT FSEEKO_FOUND)
+        # See if it's available with _LARGEFILE_SOURCE.
+        cmake_push_check_state()
+        set(CMAKE_REQUIRED_QUIET 1)
+        set(CMAKE_REQUIRED_DEFINITIONS ${LFS_DEFINITIONS} "-D_LARGEFILE_SOURCE")
+        check_symbol_exists(fseeko stdio.h fseeko_need_largefile_source)
+        cmake_pop_check_state()
+        if (fseeko_need_largefile_source)
+            message(STATUS "Looking for fseeko support with _LARGEFILE_SOURCE - found")
+            set(FSEEKO_FOUND TRUE)
+            set(_fseeko_cppflags "-D_LARGEFILE_SOURCE")
+        else()
+            message(STATUS "Looking for fseeko support with _LARGEFILE_SOURCE - not found")
+        endif()
+    endif()
+
+    set(FSEEKO_DEFINITIONS ${_fseeko_cppflags} CACHE STRING "Extra definitions for fseeko support")
+    set(FSEEKO_COMPILE_OPTIONS "" CACHE STRING "Extra compiler options for fseeko support")
+    set(FSEEKO_LIBRARIES "" CACHE STRING "Extra definitions for fseeko support")
+    set(FSEEKO_FOUND ${FSEEKO_FOUND} CACHE INTERNAL "Found fseeko")
+endfunction()
+
+if (NOT FSEEKO_FOUND)
+    _fseeko_check()
+endif()
+
+find_package_handle_standard_args(FSEEKO "Could not find fseeko. Set FSEEKO_DEFINITIONS, FSEEKO_COMPILE_OPTIONS, FSEEKO_LIBRARIES." FSEEKO_FOUND)