[MacPorts] #64994: WIP on webkit2 for PowerPC

[MacPorts]

#64994: WIP on webkit2 for PowerPC
-------------------------------------------+-------------------------
 Reporter:  barracuda156                   |      Owner:  (none)
     Type:  defect                         |     Status:  new
 Priority:  Normal                         |  Milestone:
Component:  ports                          |    Version:  2.7.2
 Keywords:  powerpc, leopard, snowleopard  |       Port:  webkit2-gtk
-------------------------------------------+-------------------------
 I have finally built all major dependencies for webkit2-gtk and rewritten
 existing patches for @2.36.0.
 However, unsurprisingly, once I sorted out all configure errors, the build
 did not proceed much further :)

 Any idea why Cmake fails to identify the arch?

 {{{
 In file included from
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/Threading.h:42,
                  from
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/AutomaticThread.h:32,
                  from
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/AutomaticThread.cpp:27:
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/PlatformRegisters.h:60:2:
 error: #error Unknown Architecture
    60 | #error Unknown Architecture
       |  ^~~~~
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/PlatformRegisters.h:63:8:
 error: 'PlatformRegisters' does not name a type
    63 | inline PlatformRegisters& registersFromUContext(ucontext_t*
 ucontext)
       |        ^~~~~~~~~~~~~~~~~
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/PlatformRegisters.h:145:12:
 error: 'PlatformRegisters' has not been declared in 'WTF'
   145 | using WTF::PlatformRegisters;
       |            ^~~~~~~~~~~~~~~~~
 In file included from
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/AutomaticThread.h:32,
                  from
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/AutomaticThread.cpp:27:
 /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_www_webkit2-gtk/webkit2-gtk/work/webkitgtk-2.36.0/Source/WTF/wtf/Threading.h:183:72:
 error: 'PlatformRegisters' has not been declared
   183 |     WTF_EXPORT_PRIVATE size_t getRegisters(const
 ThreadSuspendLocker&, PlatformRegisters&);
       |
 ^~~~~~~~~~~~~~~~~
 }}}

 Here is the source code:

 {{{
 namespace WTF {

 #if OS(DARWIN)

 #if CPU(X86)
 typedef i386_thread_state_t PlatformRegisters;
 #elif CPU(X86_64)
 typedef x86_thread_state64_t PlatformRegisters;
 #elif CPU(PPC)
 typedef ppc_thread_state_t PlatformRegisters;
 #elif CPU(PPC64)
 typedef ppc_thread_state64_t PlatformRegisters;
 #elif CPU(ARM)
 typedef arm_thread_state_t PlatformRegisters;
 #elif CPU(ARM64)
 typedef arm_thread_state64_t PlatformRegisters;
 #else
 #error Unknown Architecture
 #endif

 inline PlatformRegisters& registersFromUContext(ucontext_t* ucontext)
 {
     return ucontext->uc_mcontext->__ss;
 }

 #elif OS(WINDOWS)

 using PlatformRegisters = CONTEXT;

 #elif HAVE(MACHINE_CONTEXT)

 struct PlatformRegisters {
     mcontext_t machineContext;
 };

 inline PlatformRegisters& registersFromUContext(ucontext_t* ucontext)
 {
 #if OS(OPENBSD)
     return *bitwise_cast<PlatformRegisters*>(ucontext);
 #elif CPU(PPC)
     return
 *bitwise_cast<PlatformRegisters*>(ucontext->uc_mcontext.uc_regs);
 #else
     return *bitwise_cast<PlatformRegisters*>(&ucontext->uc_mcontext);
 #endif
 }

 #else

 struct PlatformRegisters {
     void* stackPointer;
 };

 #endif

 } // namespace WTF
 }}}

 I also tried to specify the arch directly in configure.args, it made no
 effect. (Argument does get passed to Cmake, but the same error occurs.)
 From what I can see, no patches were applied to this header file
 (explicitly, I did not add PPC there, it is there in the source code).

 P. S. I no one objects, we may keep this ticket as a track record and
 invitation to participate. If no one joins in, I will slowly post updates
 from my end.

-- 
Ticket URL: <https://trac.macports.org/ticket/64994>
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