webkitgtk: add upstream patch for failed gcc6 builds

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
[Thomas: add upstream patch description in the patch.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/package/webkitgtk/0001-fix-gcc6-builds.patch b/package/webkitgtk/0001-fix-gcc6-builds.patch
new file mode 100644 (file)
index 0000000..35487ad
--- /dev/null
+++ b/package/webkitgtk/0001-fix-gcc6-builds.patch
@@ -0,0 +1,53 @@
+[CMake] Build failure with GCC 6 (fatal error: stdlib.h: No such file or directory)
+
+https://bugs.webkit.org/show_bug.cgi?id=161697
+
+Reviewed by Michael Catanzaro.
+
+Get the list of system includes from GCC and add it to the CMake
+list of implicit includes. This way, CMake will filter any of this
+directories from the list of includes when calling the compiler.
+
+This avoids an issue with GCC 6 that causes build failures when
+including the default include path as a system include (-isystem).
+
+Upstream, from: https://trac.webkit.org/changeset/205672
+
+Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
+
+Index: trunk/Source/cmake/OptionsCommon.cmake
+===================================================================
+--- trunk/Source/cmake/OptionsCommon.cmake     (revision 204084)
++++ trunk/Source/cmake/OptionsCommon.cmake     (revision 205672)
+@@ -36,4 +36,31 @@
+     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fcolor-diagnostics")
+     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fcolor-diagnostics")
++endif ()
++
++# Ensure that the default include system directories are added to the list of CMake implicit includes.
++# This workarounds an issue that happens when using GCC 6 and using system includes (-isystem).
++# For more details check: https://bugs.webkit.org/show_bug.cgi?id=161697
++macro(DETERMINE_GCC_SYSTEM_INCLUDE_DIRS _lang _compiler _flags _result)
++    file(WRITE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy" "\n")
++    separate_arguments(_buildFlags UNIX_COMMAND "${_flags}")
++    execute_process(COMMAND ${_compiler} ${_buildFlags} -v -E -x ${_lang} -dD dummy
++                    WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/CMakeFiles OUTPUT_QUIET
++                    ERROR_VARIABLE _gccOutput)
++    file(REMOVE "${CMAKE_BINARY_DIR}/CMakeFiles/dummy")
++    if ("${_gccOutput}" MATCHES "> search starts here[^\n]+\n *(.+) *\n *End of (search) list")
++        set(${_result} ${CMAKE_MATCH_1})
++        string(REPLACE "\n" " " ${_result} "${${_result}}")
++        separate_arguments(${_result})
++    endif ()
++endmacro()
++
++if (CMAKE_COMPILER_IS_GNUCC)
++   DETERMINE_GCC_SYSTEM_INCLUDE_DIRS("c" "${CMAKE_C_COMPILER}" "${CMAKE_C_FLAGS}" SYSTEM_INCLUDE_DIRS)
++   set(CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES ${CMAKE_C_IMPLICIT_INCLUDE_DIRECTORIES} ${SYSTEM_INCLUDE_DIRS})
++endif ()
++
++if (CMAKE_COMPILER_IS_GNUCXX)
++   DETERMINE_GCC_SYSTEM_INCLUDE_DIRS("c++" "${CMAKE_CXX_COMPILER}" "${CMAKE_CXX_FLAGS}" SYSTEM_INCLUDE_DIRS)
++   set(CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES} ${SYSTEM_INCLUDE_DIRS})
+ endif ()
+