webkitgtk: Upgrade to 2.12.1

Fix build with gcc-6

Do not tinker with -isystem, this causes issues
where gcc does not find standard C++ headers since
the default search ordered for system headers is
changed and is not correct anymore. Errorr like

WebCore/editing/gtk/EditorGtk.cpp:27:
/mnt/oe/poky/build/tmp/sysroots/qemuarm/usr/include/c++/6.0.1/cstdlib:75:25: fatal error: stdlib.h: No such file or directory
 #include_next <stdlib.h>

It brings a patch to fix typename mismatch
for pow()

see
 https://bugs.webkit.org/show_bug.cgi?id=153071

Drop upstreamed patches
User -fPIC on aarch64 to fix
relocation truncated to fit: R_AARCH64_LD64_GOTPAGE_LO15 against symbol `__stack_chk_guard@@GLIBC_2.17' defined in .data.rel.ro section

(From OE-Core rev: 0a6e162c47017ecf51b466218fb549e0e199f4c4)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

4 files changed, 287 insertions, 22 deletions

diff --git a/meta/recipes-sato/webkit/files/0001-OptionsGTK.cmake-drop-the-hardcoded-introspection-gt.patch b/meta/recipes-sato/webkit/files/0001-OptionsGTK.cmake-drop-the-hardcoded-introspection-gt.patch
index 3d004db29c..93a69c0292 100644
--- a/meta/recipes-sato/webkit/files/0001-OptionsGTK.cmake-drop-the-hardcoded-introspection-gt.patch
+++ b/meta/recipes-sato/webkit/files/0001-OptionsGTK.cmake-drop-the-hardcoded-introspection-gt.patch
@@ -13,11 +13,11 @@ Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
  Source/cmake/OptionsGTK.cmake | 6 ------
  1 file changed, 6 deletions(-)
 
-diff --git a/Source/cmake/OptionsGTK.cmake b/Source/cmake/OptionsGTK.cmake
-index e5f1f5b..4698036 100644
---- a/Source/cmake/OptionsGTK.cmake
-+++ b/Source/cmake/OptionsGTK.cmake
-@@ -443,12 +443,6 @@ if (USE_LIBHYPHEN)
+Index: webkitgtk-2.12.1/Source/cmake/OptionsGTK.cmake
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/cmake/OptionsGTK.cmake
++++ webkitgtk-2.12.1/Source/cmake/OptionsGTK.cmake
+@@ -424,12 +424,6 @@ if (USE_LIBHYPHEN)
      endif ()
  endif ()
  
@@ -27,9 +27,6 @@ index e5f1f5b..4698036 100644
 -    set(ENABLE_INTROSPECTION OFF)
 -endif ()
 -
- set(DERIVED_SOURCES_GOBJECT_DOM_BINDINGS_DIR ${DERIVED_SOURCES_DIR}/webkitdom)
- set(DERIVED_SOURCES_WEBKITGTK_DIR ${DERIVED_SOURCES_DIR}/webkitgtk)
- set(DERIVED_SOURCES_WEBKITGTK_API_DIR ${DERIVED_SOURCES_WEBKITGTK_DIR}/webkit)
--- 
-2.7.0
-
+ # Override the cached variable, gtk-doc does not really work when building on Mac.
+ if (APPLE)
+     set(ENABLE_GTKDOC OFF)
diff --git a/meta/recipes-sato/webkit/files/0001-WebKitMacros-Append-to-I-and-not-to-isystem.patch b/meta/recipes-sato/webkit/files/0001-WebKitMacros-Append-to-I-and-not-to-isystem.patch
new file mode 100644
index 0000000000..25b3c9f243
--- /dev/null
+++ b/meta/recipes-sato/webkit/files/0001-WebKitMacros-Append-to-I-and-not-to-isystem.patch
@@ -0,0 +1,223 @@
+From 53a00058184cd710c6f4375f4daab49d7e885a30 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sun, 17 Apr 2016 12:35:41 -0700
+Subject: [PATCH] WebKitMacros: Append to -I and not to -isystem
+
+gcc-6 has now introduced stdlib.h in libstdc++ for better
+compliance and its including the C library stdlib.h using
+include_next which is sensitive to order of system header
+include paths. Its infact better to not tinker with the
+system header include paths at all. Since adding /usr/include
+to -system is redundant and compiler knows about it moreover
+now with gcc6 it interferes with compiler's functioning
+and ends up with compile errors e.g.
+
+/usr/include/c++/6.0.0/cstdlib:75:25: fatal error: stdlib.h: No such file or directory
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ Source/cmake/WebKitMacros.cmake | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+Index: webkitgtk-2.12.1/Source/JavaScriptCore/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/JavaScriptCore/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/JavaScriptCore/CMakeLists.txt
+@@ -1311,7 +1311,7 @@ add_subdirectory(shell)
+ 
+ WEBKIT_WRAP_SOURCELIST(${JavaScriptCore_SOURCES})
+ include_directories(${JavaScriptCore_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${JavaScriptCore_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${JavaScriptCore_SYSTEM_INCLUDE_DIRECTORIES})
+ add_library(JavaScriptCore ${JavaScriptCore_LIBRARY_TYPE} ${JavaScriptCore_HEADERS} ${JavaScriptCore_SOURCES})
+ target_link_libraries(JavaScriptCore ${JavaScriptCore_LIBRARIES})
+ set_target_properties(JavaScriptCore PROPERTIES COMPILE_DEFINITIONS "BUILDING_JavaScriptCore")
+Index: webkitgtk-2.12.1/Source/WTF/wtf/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WTF/wtf/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/WTF/wtf/CMakeLists.txt
+@@ -286,7 +286,7 @@ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ 
+ WEBKIT_WRAP_SOURCELIST(${WTF_SOURCES})
+ include_directories(${WTF_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WTF_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WTF_SYSTEM_INCLUDE_DIRECTORIES})
+ add_library(WTF ${WTF_LIBRARY_TYPE} ${WTF_HEADERS} ${WTF_SOURCES})
+ target_link_libraries(WTF ${WTF_LIBRARIES})
+ set_target_properties(WTF PROPERTIES COMPILE_DEFINITIONS "BUILDING_WTF")
+Index: webkitgtk-2.12.1/Source/WebCore/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebCore/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/WebCore/CMakeLists.txt
+@@ -3748,7 +3748,7 @@ WEBKIT_WRAP_SOURCELIST(${WebCore_IDL_FIL
+ WEBKIT_WRAP_SOURCELIST(${WebCoreTestSupport_IDL_FILES} ${WebCoreTestSupport_SOURCES})
+ 
+ include_directories(${WebCore_INCLUDE_DIRECTORIES} ${WebCoreTestSupport_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WebCore_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WebCore_SYSTEM_INCLUDE_DIRECTORIES})
+ 
+ if (MSVC)
+     ADD_PRECOMPILED_HEADER("WebCorePrefix.h" "WebCorePrefix.cpp" WebCore_SOURCES)
+Index: webkitgtk-2.12.1/Source/WebKit/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebKit/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/WebKit/CMakeLists.txt
+@@ -28,7 +28,7 @@ set(WebKit_LIBRARIES
+ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ 
+ include_directories(${WebKit_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WebKit_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WebKit_SYSTEM_INCLUDE_DIRECTORIES})
+ 
+ if (MSVC)
+     ADD_PRECOMPILED_HEADER("WebKitPrefix.h" "win/WebKitPrefix.cpp" WebKit_SOURCES)
+Index: webkitgtk-2.12.1/Source/WebKit2/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebKit2/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/WebKit2/CMakeLists.txt
+@@ -756,7 +756,7 @@ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ GENERATE_WEBKIT2_MESSAGE_SOURCES(WebKit2_DERIVED_SOURCES "${WebKit2_MESSAGES_IN_FILES}")
+ 
+ include_directories(${WebKit2_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WebKit2_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WebKit2_SYSTEM_INCLUDE_DIRECTORIES})
+ add_library(WebKit2 ${WebKit2_LIBRARY_TYPE} ${WebKit2_SOURCES} ${WebKit2_DERIVED_SOURCES})
+ 
+ add_dependencies(WebKit2 WebCore ${WEBKIT2_EXTRA_DEPENDENCIES})
+Index: webkitgtk-2.12.1/Tools/DumpRenderTree/TestNetscapePlugIn/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/DumpRenderTree/TestNetscapePlugIn/CMakeLists.txt
++++ webkitgtk-2.12.1/Tools/DumpRenderTree/TestNetscapePlugIn/CMakeLists.txt
+@@ -42,7 +42,7 @@ set(WebKitTestNetscapePlugin_SYSTEM_INCL
+ )
+ 
+ include_directories(${WebKitTestNetscapePlugin_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WebKitTestNetscapePlugin_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WebKitTestNetscapePlugin_SYSTEM_INCLUDE_DIRECTORIES})
+ 
+ set(WebKitTestNetscapePlugin_LIBRARIES
+     ${X11_LIBRARIES}
+Index: webkitgtk-2.12.1/Tools/ImageDiff/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/ImageDiff/CMakeLists.txt
++++ webkitgtk-2.12.1/Tools/ImageDiff/CMakeLists.txt
+@@ -14,7 +14,7 @@ set(IMAGE_DIFF_LIBRARIES
+ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ 
+ include_directories(${IMAGE_DIFF_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${IMAGE_DIFF_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${IMAGE_DIFF_SYSTEM_INCLUDE_DIRECTORIES})
+ add_executable(ImageDiff ${IMAGE_DIFF_SOURCES})
+ target_link_libraries(ImageDiff ${IMAGE_DIFF_LIBRARIES})
+ set_target_properties(ImageDiff PROPERTIES FOLDER "Tools")
+Index: webkitgtk-2.12.1/Tools/MiniBrowser/gtk/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/MiniBrowser/gtk/CMakeLists.txt
++++ webkitgtk-2.12.1/Tools/MiniBrowser/gtk/CMakeLists.txt
+@@ -55,7 +55,7 @@ endif ()
+ add_definitions(-DGDK_VERSION_MIN_REQUIRED=GDK_VERSION_3_6)
+ 
+ include_directories(${MiniBrowser_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${MiniBrowser_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${MiniBrowser_SYSTEM_INCLUDE_DIRECTORIES})
+ add_executable(MiniBrowser ${MiniBrowser_SOURCES})
+ target_link_libraries(MiniBrowser ${MiniBrowser_LIBRARIES})
+ set_target_properties(MiniBrowser PROPERTIES FOLDER "Tools")
+Index: webkitgtk-2.12.1/Tools/WebKitTestRunner/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/WebKitTestRunner/CMakeLists.txt
++++ webkitgtk-2.12.1/Tools/WebKitTestRunner/CMakeLists.txt
+@@ -115,7 +115,7 @@ GENERATE_BINDINGS(WebKitTestRunner_SOURC
+ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ 
+ include_directories(${WebKitTestRunner_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${WebKitTestRunner_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${WebKitTestRunner_SYSTEM_INCLUDE_DIRECTORIES})
+ 
+ add_library(TestRunnerInjectedBundle SHARED ${WebKitTestRunnerInjectedBundle_SOURCES})
+ target_link_libraries(TestRunnerInjectedBundle ${WebKitTestRunner_LIBRARIES})
+Index: webkitgtk-2.12.1/Source/WebCore/PlatformGTK.cmake
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebCore/PlatformGTK.cmake
++++ webkitgtk-2.12.1/Source/WebCore/PlatformGTK.cmake
+@@ -324,7 +324,7 @@ if (ENABLE_PLUGIN_PROCESS_GTK2)
+         ${GTK2_INCLUDE_DIRS}
+         ${GDK2_INCLUDE_DIRS}
+     )
+-    target_include_directories(WebCorePlatformGTK2 SYSTEM PRIVATE
++    target_include_directories(WebCorePlatformGTK2 PRIVATE
+         ${WebCore_SYSTEM_INCLUDE_DIRECTORIES}
+     )
+     target_link_libraries(WebCorePlatformGTK2
+@@ -366,7 +366,7 @@ WEBKIT_SET_EXTRA_COMPILER_FLAGS(WebCoreP
+ target_include_directories(WebCorePlatformGTK PRIVATE
+     ${WebCore_INCLUDE_DIRECTORIES}
+ )
+-target_include_directories(WebCorePlatformGTK SYSTEM PRIVATE
++target_include_directories(WebCorePlatformGTK PRIVATE
+     ${WebCore_SYSTEM_INCLUDE_DIRECTORIES}
+     ${GTK_INCLUDE_DIRS}
+     ${GDK_INCLUDE_DIRS}
+@@ -384,7 +384,7 @@ include_directories(
+     "${DERIVED_SOURCES_GOBJECT_DOM_BINDINGS_DIR}"
+ )
+ 
+-include_directories(SYSTEM
++include_directories(
+     ${WebCore_SYSTEM_INCLUDE_DIRECTORIES}
+ )
+ 
+Index: webkitgtk-2.12.1/Tools/TestWebKitAPI/PlatformGTK.cmake
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/TestWebKitAPI/PlatformGTK.cmake
++++ webkitgtk-2.12.1/Tools/TestWebKitAPI/PlatformGTK.cmake
+@@ -20,7 +20,7 @@ include_directories(
+     ${WEBKIT2_DIR}/UIProcess/API/gtk
+ )
+ 
+-include_directories(SYSTEM
++include_directories(
+     ${GDK3_INCLUDE_DIRS}
+     ${GLIB_INCLUDE_DIRS}
+     ${GTK3_INCLUDE_DIRS}
+Index: webkitgtk-2.12.1/Tools/TestWebKitAPI/Tests/WebKit2Gtk/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Tools/TestWebKitAPI/Tests/WebKit2Gtk/CMakeLists.txt
++++ webkitgtk-2.12.1/Tools/TestWebKitAPI/Tests/WebKit2Gtk/CMakeLists.txt
+@@ -23,7 +23,7 @@ include_directories(
+     ${TOOLS_DIR}/TestWebKitAPI/gtk/WebKit2Gtk
+ )
+ 
+-include_directories(SYSTEM
++include_directories(
+     ${ATSPI_INCLUDE_DIRS}
+     ${GLIB_INCLUDE_DIRS}
+     ${GSTREAMER_INCLUDE_DIRS}
+Index: webkitgtk-2.12.1/Source/WebKit2/PlatformGTK.cmake
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebKit2/PlatformGTK.cmake
++++ webkitgtk-2.12.1/Source/WebKit2/PlatformGTK.cmake
+@@ -816,7 +816,7 @@ if (ENABLE_PLUGIN_PROCESS_GTK2)
+     target_include_directories(WebKitPluginProcess2 PRIVATE
+         ${WebKit2CommonIncludeDirectories}
+     )
+-    target_include_directories(WebKitPluginProcess2 SYSTEM PRIVATE
++    target_include_directories(WebKitPluginProcess2 PRIVATE
+          ${WebKit2CommonSystemIncludeDirectories}
+          ${GTK2_INCLUDE_DIRS}
+          ${GDK2_INCLUDE_DIRS}
+Index: webkitgtk-2.12.1/Source/JavaScriptCore/shell/CMakeLists.txt
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/JavaScriptCore/shell/CMakeLists.txt
++++ webkitgtk-2.12.1/Source/JavaScriptCore/shell/CMakeLists.txt
+@@ -20,7 +20,7 @@ WEBKIT_INCLUDE_CONFIG_FILES_IF_EXISTS()
+ 
+ WEBKIT_WRAP_SOURCELIST(${JSC_SOURCES})
+ include_directories(./ ${JavaScriptCore_INCLUDE_DIRECTORIES})
+-include_directories(SYSTEM ${JavaScriptCore_SYSTEM_INCLUDE_DIRECTORIES})
++include_directories(${JavaScriptCore_SYSTEM_INCLUDE_DIRECTORIES})
+ add_executable(jsc ${JSC_SOURCES})
+ target_link_libraries(jsc ${JSC_LIBRARIES})
+ set_target_properties(jsc PROPERTIES FOLDER "JavaScriptCore")
diff --git a/meta/recipes-sato/webkit/files/0001-When-building-introspection-files-add-CMAKE_C_FLAGS-.patch b/meta/recipes-sato/webkit/files/0001-When-building-introspection-files-add-CMAKE_C_FLAGS-.patch
index 44b43cdbba..3f71297f50 100644
--- a/meta/recipes-sato/webkit/files/0001-When-building-introspection-files-add-CMAKE_C_FLAGS-.patch
+++ b/meta/recipes-sato/webkit/files/0001-When-building-introspection-files-add-CMAKE_C_FLAGS-.patch
@@ -13,28 +13,25 @@ Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
  Source/WebKit2/PlatformGTK.cmake | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)
 
-diff --git a/Source/WebKit2/PlatformGTK.cmake b/Source/WebKit2/PlatformGTK.cmake
-index 706f1e8..14a1c3b 100644
---- a/Source/WebKit2/PlatformGTK.cmake
-+++ b/Source/WebKit2/PlatformGTK.cmake
-@@ -884,7 +884,7 @@ add_custom_command(
+Index: webkitgtk-2.12.1/Source/WebKit2/PlatformGTK.cmake
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/WebKit2/PlatformGTK.cmake
++++ webkitgtk-2.12.1/Source/WebKit2/PlatformGTK.cmake
+@@ -910,7 +910,7 @@ add_custom_command(
      OUTPUT ${CMAKE_BINARY_DIR}/WebKit2-${WEBKITGTK_API_VERSION}.gir
      DEPENDS WebKit2
      DEPENDS ${CMAKE_BINARY_DIR}/JavaScriptCore-${WEBKITGTK_API_VERSION}.gir
 -    COMMAND CC=${CMAKE_C_COMPILER} CFLAGS=-Wno-deprecated-declarations LDFLAGS=
 +    COMMAND CC=${CMAKE_C_COMPILER} CFLAGS=-Wno-deprecated-declarations\ ${CMAKE_C_FLAGS} LDFLAGS=
-         LD_LIBRARY_PATH="${INTROSPECTION_ADDITIONAL_LIBRARY_PATH}"
+         ${LOADER_LIBRARY_PATH_VAR}="${INTROSPECTION_ADDITIONAL_LIBRARY_PATH}"
          ${INTROSPECTION_SCANNER}
          --quiet
-@@ -930,7 +930,7 @@ add_custom_command(
+@@ -951,7 +951,7 @@ add_custom_command(
      OUTPUT ${CMAKE_BINARY_DIR}/WebKit2WebExtension-${WEBKITGTK_API_VERSION}.gir
      DEPENDS ${CMAKE_BINARY_DIR}/JavaScriptCore-${WEBKITGTK_API_VERSION}.gir
      DEPENDS ${CMAKE_BINARY_DIR}/WebKit2-${WEBKITGTK_API_VERSION}.gir
 -    COMMAND CC=${CMAKE_C_COMPILER} CFLAGS=-Wno-deprecated-declarations
 +    COMMAND CC=${CMAKE_C_COMPILER} CFLAGS=-Wno-deprecated-declarations\ ${CMAKE_C_FLAGS}
          LDFLAGS="${INTROSPECTION_ADDITIONAL_LDFLAGS}"
-         LD_LIBRARY_PATH="${INTROSPECTION_ADDITIONAL_LIBRARY_PATH}"
+         ${LOADER_LIBRARY_PATH_VAR}="${INTROSPECTION_ADDITIONAL_LIBRARY_PATH}"
          ${INTROSPECTION_SCANNER}
--- 
-2.6.4
-
diff --git a/meta/recipes-sato/webkit/files/musl-fixes.patch b/meta/recipes-sato/webkit/files/musl-fixes.patch
new file mode 100644
index 0000000000..4fdd56fea0
--- /dev/null
+++ b/meta/recipes-sato/webkit/files/musl-fixes.patch
@@ -0,0 +1,48 @@
+Replace __GLIBC__ with __linux__ since musl also supports it
+so checking __linux__ is more accomodating
+
+See http://git.alpinelinux.org/cgit/aports/tree/community/webkit2gtk/musl-fixes.patch?id=219435d86d7e8fac9474344a7431c62bd2525184
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+
+Index: webkitgtk-2.12.1/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+===================================================================
+--- webkitgtk-2.12.1.orig/Source/JavaScriptCore/heap/MachineStackMarker.cpp
++++ webkitgtk-2.12.1/Source/JavaScriptCore/heap/MachineStackMarker.cpp
+@@ -566,7 +566,7 @@ void* MachineThreads::Thread::Registers:
+ #error Unknown Architecture
+ #endif
+ 
+-#elif defined(__GLIBC__) && ENABLE(JIT)
++#elif defined(__linux__) && ENABLE(JIT)
+ 
+ #if CPU(X86)
+     return reinterpret_cast<void*>((uintptr_t) regs.machineContext.gregs[REG_ESP]);
+@@ -665,7 +665,7 @@ void* MachineThreads::Thread::Registers:
+ #error Unknown Architecture
+ #endif
+ 
+-#elif defined(__GLIBC__)
++#elif defined(__linux__) // glibc and musl
+ 
+ // The following sequence depends on glibc's sys/ucontext.h.
+ #if CPU(X86)
+@@ -747,7 +747,7 @@ void* MachineThreads::Thread::Registers:
+ #error Unknown Architecture
+ #endif
+ 
+-#elif defined(__GLIBC__)
++#elif defined(__linux__) // glibc and musl
+ 
+ // The following sequence depends on glibc's sys/ucontext.h.
+ #if CPU(X86)
+@@ -838,7 +838,7 @@ void* MachineThreads::Thread::Registers:
+ #error Unknown Architecture
+ #endif
+ 
+-#elif defined(__GLIBC__)
++#elif defined(__linux__) // glibc and musl
+ 
+ // The following sequence depends on glibc's sys/ucontext.h.
+ #if CPU(X86)