i386.c

   1 /*
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  28
  29 // This is the only C file compiled into Libsystem when building for i386.
  30 // We use EXCLUDED_ and INCLUDED_SOURCE_FILES in the xcconfig to accomplish
  31 // this.
  32 //
  33 // i386 is no longer a supported architecture for macOS. The kernel doesn’t run
  34 // i386 macOS executables. However, we cannot completely remove the i386
  35 // slice from libSystem.B.dylib. In order to support the watchOS Simulator,
  36 // macOS includes several libraries with i386 slices. The watchOS Simulator
  37 // uses the i386 ISA with a different  Mach-O platform and its own entire set
  38 // of system libraries. Some of those libraries (including those from the clang/
  39 // llvm project) verify that the compiler works by compiling and linking a
  40 // simple executable. That would fail if Libsystem lacked an i386 slice.
  41 // So, we will preserve a vestigial i386 slice, but no executables can actually
  42 // use it to run.
  43 // rdar://problem/59703537
  44
  45 #include <TargetConditionals.h>
  46
  47 #if !defined(__i386__) || !defined(TARGET_OS_OSX) || (TARGET_OS_OSX == 0)
  48 #error "This file should not be built for this environment"
  49 #endif // !defined(__i386__) || !defined(TARGET_OS_OSX) || (TARGET_OS_OSX == 0)
  50
  51 #include <sys/reason.h>
  52
  53 struct ProgramVars;
  54
  55 __attribute__((constructor))
  56 static void
  57 libSystem_initializer(int argc __attribute__((unused)),
  58               const char* argv[]  __attribute__((unused)),
  59               const char* envp[]  __attribute__((unused)),
  60               const char* apple[]  __attribute__((unused)),
  61               const struct ProgramVars* vars  __attribute__((unused)))
  62 {
  63         abort_with_reason(OS_REASON_LIBSYSTEM, 386,
  64                         "i386 is not supported on macOS",
  65                         OS_REASON_FLAG_CONSISTENT_FAILURE);
  66 }