Add the dynamic linker name and fix a type name to use the public name
instead of the glibc internal name.

Build tested on m68k-linux-musl and m68k-linux-gnu.

gcc/ChangeLog:

2019-11-15  Szabolcs Nagy  <szabolcs.n...@arm.com>

        * config/m68k/linux.h (MUSL_DYNAMIC_LINKER): Define.

libgcc/ChangeLog:

2019-11-15  Szabolcs Nagy  <szabolcs.n...@arm.com>

        * config/m68k/linux-unwind.h (struct uw_ucontext): Use sigset_t instead
        of __sigset_t.
diff --git a/gcc/config/m68k/linux.h b/gcc/config/m68k/linux.h
index ebdf0281071..beef554b31c 100644
--- a/gcc/config/m68k/linux.h
+++ b/gcc/config/m68k/linux.h
@@ -73,6 +73,9 @@ along with GCC; see the file COPYING3.  If not see
 
 #define GLIBC_DYNAMIC_LINKER "/lib/ld.so.1"
 
+#undef MUSL_DYNAMIC_LINKER
+#define MUSL_DYNAMIC_LINKER "/lib/ld-musl-m68k.so.1"
+
 #undef LINK_SPEC
 #define LINK_SPEC "-m m68kelf %{shared} \
   %{!shared: \
diff --git a/libgcc/config/m68k/linux-unwind.h b/libgcc/config/m68k/linux-unwind.h
index fbe0d4748ba..57c354ee9b4 100644
--- a/libgcc/config/m68k/linux-unwind.h
+++ b/libgcc/config/m68k/linux-unwind.h
@@ -37,7 +37,7 @@ struct uw_ucontext {
 	stack_t		  uc_stack;
 	mcontext_t	  uc_mcontext;
 	unsigned long	  uc_filler[80];
-	__sigset_t	  uc_sigmask;
+	sigset_t	  uc_sigmask;
 };
 
 #define MD_FALLBACK_FRAME_STATE_FOR m68k_fallback_frame_state

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