diff -ruN gcc-8.3.0-old/fixincludes/fixincl.x gcc-8.3.0/fixincludes/fixincl.x
--- gcc-8.3.0-old/fixincludes/fixincl.x	2018-02-22 11:12:26.000000000 -0500
+++ gcc-8.3.0/fixincludes/fixincl.x	2019-03-28 15:59:33.000000000 -0400
@@ -2,11 +2,11 @@
  *
  * DO NOT EDIT THIS FILE   (fixincl.x)
  *
- * It has been AutoGen-ed  February 22, 2018 at 03:46:51 PM by AutoGen 5.18
+ * It has been AutoGen-ed  March 28, 2019 at 03:59:33 PM by AutoGen 5.18.16
  * From the definitions    inclhack.def
  * and the template file   fixincl
  */
-/* DO NOT SVN-MERGE THIS FILE, EITHER Thu Feb 22 15:46:51 UTC 2018
+/* DO NOT SVN-MERGE THIS FILE, EITHER Thu Mar 28 15:59:33 EDT 2019
  *
  * You must regenerate it.  Use the ./genfixes script.
  *
@@ -15,7 +15,7 @@
  * certain ANSI-incompatible system header files which are fixed to work
  * correctly with ANSI C and placed in a directory that GNU C will search.
  *
- * This file contains 249 fixup descriptions.
+ * This file contains 250 fixup descriptions.
  *
  * See README for more information.
  *
@@ -2584,6 +2584,50 @@
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * *
  *
+ *  Description of Darwin_Ucred__Atomic fix
+ */
+tSCC zDarwin_Ucred__AtomicName[] =
+     "darwin_ucred__Atomic";
+
+/*
+ *  File name selection pattern
+ */
+tSCC zDarwin_Ucred__AtomicList[] =
+  "sys/ucred.h\0";
+/*
+ *  Machine/OS name selection pattern
+ */
+tSCC* apzDarwin_Ucred__AtomicMachs[] = {
+        "*-*-darwin18.5.*",
+        (const char*)NULL };
+
+/*
+ *  content selection pattern - do fix if pattern found
+ */
+tSCC zDarwin_Ucred__AtomicSelect0[] =
+       "_Atomic";
+
+#define    DARWIN_UCRED__ATOMIC_TEST_CT  1
+static tTestDesc aDarwin_Ucred__AtomicTests[] = {
+  { TT_EGREP,    zDarwin_Ucred__AtomicSelect0, (regex_t*)NULL }, };
+
+/*
+ *  Fix Command Arguments for Darwin_Ucred__Atomic
+ */
+static const char* apzDarwin_Ucred__AtomicPatch[] = {
+    "wrap",
+    "\n\
+#if defined(__cplusplus) && __cplusplus >= 201103L\n\
+#  define _Atomic volatile\n\
+#endif\n",
+    "\n\
+#if defined(__cplusplus) && __cplusplus >= 201103L\n\
+#  undef _Atomic\n\
+#endif\n",
+    (char*)NULL };
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * *
+ *
  *  Description of Darwin_9_Long_Double_Funcs_2 fix
  */
 tSCC zDarwin_9_Long_Double_Funcs_2Name[] =
@@ -10099,9 +10143,9 @@
  *
  *  List of all fixes
  */
-#define REGEX_COUNT          287
+#define REGEX_COUNT          288
 #define MACH_LIST_SIZE_LIMIT 187
-#define FIX_COUNT            249
+#define FIX_COUNT            250
 
 /*
  *  Enumerate the fixes
@@ -10168,6 +10212,7 @@
     CTRL_QUOTES_USE_FIXIDX,
     CXX_UNREADY_FIXIDX,
     DARWIN_AVAILABILITYINTERNAL_FIXIDX,
+    DARWIN_UCRED__ATOMIC_FIXIDX,
     DARWIN_9_LONG_DOUBLE_FUNCS_2_FIXIDX,
     DARWIN_EXTERNC_FIXIDX,
     DARWIN_GCC4_BREAKAGE_FIXIDX,
@@ -10664,6 +10709,11 @@
      DARWIN_AVAILABILITYINTERNAL_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,
      aDarwin_AvailabilityinternalTests,   apzDarwin_AvailabilityinternalPatch, 0 },
 
+  {  zDarwin_Ucred__AtomicName,    zDarwin_Ucred__AtomicList,
+     apzDarwin_Ucred__AtomicMachs,
+     DARWIN_UCRED__ATOMIC_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,
+     aDarwin_Ucred__AtomicTests,   apzDarwin_Ucred__AtomicPatch, 0 },
+
   {  zDarwin_9_Long_Double_Funcs_2Name,    zDarwin_9_Long_Double_Funcs_2List,
      apzDarwin_9_Long_Double_Funcs_2Machs,
      DARWIN_9_LONG_DOUBLE_FUNCS_2_TEST_CT, FD_MACH_ONLY | FD_SUBROUTINE,
diff -ruN gcc-8.3.0-old/fixincludes/inclhack.def gcc-8.3.0/fixincludes/inclhack.def
--- gcc-8.3.0-old/fixincludes/inclhack.def	2018-02-22 11:12:26.000000000 -0500
+++ gcc-8.3.0/fixincludes/inclhack.def	2019-03-28 15:59:18.739714124 -0400
@@ -1268,6 +1268,36 @@
 };
 
 /*
+ *  macOS 10.14.4 <sys/ucred.h> uses the C _Atomic keyword in C++ code.
+ */
+fix = {
+    hackname  = darwin_ucred__Atomic;
+    mach      = "*-*-darwin18.5.*";
+    files     = sys/ucred.h;
+    select    = "_Atomic";
+
+    c_fix     = wrap;
+
+    c_fix_arg = <<- _EOArg_
+
+	#if defined(__cplusplus) && __cplusplus >= 201103L
+	#  define _Atomic volatile
+	#endif
+
+	_EOArg_;
+
+    c_fix_arg = <<- _EOArg_
+
+	#if defined(__cplusplus) && __cplusplus >= 201103L
+	#  undef _Atomic
+	#endif
+
+	_EOArg_;
+
+    test_text = "#include <sys/sysctl.h>\n";
+};
+
+/*
  *  For the AAB_darwin7_9_long_double_funcs fix to be useful,
  *  you have to not use "" includes.
  */
diff -ruN gcc-8.3.0-old/gcc/config/darwin-driver.c gcc-8.3.0/gcc/config/darwin-driver.c
--- gcc-8.3.0-old/gcc/config/darwin-driver.c	2018-01-03 05:03:58.000000000 -0500
+++ gcc-8.3.0/gcc/config/darwin-driver.c	2019-03-28 16:05:19.856598766 -0400
@@ -27,7 +27,9 @@
 #include "diagnostic-core.h"
 
 #ifndef CROSS_DIRECTORY_STRUCTURE
+#define _Atomic volatile
 #include <sys/sysctl.h>
+#undef _Atomic
 #include "xregex.h"
 
 static char *
