Merge pull request #92 from janciesko/mac-allow-system-ucontext-2

Mac allow system ucontext

Author: janciesko

config/qthread_check_swapcontext.m4

@@ -63,13 +63,7 @@ AS_IF([test "x$ac_cv_func_getcontext" = "xyes"], [
 				   [the uc_stack structure in ucontext_t has an ss_flags structure that needs to be initialized])])
 AC_CACHE_CHECK([whether swapcontext works properly],
   [qthread_cv_swapcontext_works],
-  [
-  case "$host" in
-  *-darwin*)
-  qthread_cv_swapcontext_works=no
-  ;;
-  *)
-  AC_RUN_IFELSE([AC_LANG_SOURCE([[
+  [AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <ucontext.h>
 #include <stdlib.h>
 ucontext_t child, parent;
@@ -97,9 +91,7 @@ int main()
 	       [AS_IF([test "x$enable_fastcontext" = xyes],
 		          [qthread_cv_swapcontext_works=no],
 				  [qthread_cv_swapcontext_works=yes])],
-	       [qthread_cv_swapcontext_works=yes])])
-	;;
-	esac])
+	       [qthread_cv_swapcontext_works=yes])])])
 AS_IF([test "$qthread_cv_swapcontext_works" = yes],
 	[AC_DEFINE([HAVE_NATIVE_MAKECONTEXT], [1], [The system provides functional native make/swap/get-context functions])
 	 QTHREAD_CHECK_MAKECONTEXT_SPLIT_ARGS(

src/fastcontext/asm.S

@@ -43,7 +43,7 @@
 #  define SET _qt_setmctxt
 #  define GET _qt_getmctxt
 # else
-#  error What kind of a Mac is this?
+#  error What kind of a Mac is this? If M1, use CFLAGS=-D_XOPEN_SOURCE and --disable-fastcontext --with-default-stack-size=65536 in configure.
 # endif
 #elif defined(__linux__)
 # if (QTHREAD_ASSEMBLY_ARCH == QTHREAD_ARM)