Disable ssp on -nostdlib, -nodefaultlibs and -ffreestanding 
Change the buffer size.

--- a/gcc/gcc.c	2017-07-04 09:15:57.740793000 +0200
+++ b/gcc/gcc.c	2018-03-02 13:58:44.387741114 +0100
@@ -857,6 +857,12 @@ proper position among the other output f
 #define LINK_GCC_C_SEQUENCE_SPEC "%G %L %G"
 #endif
 
+#ifdef ENABLE_DEFAULT_SSP
+#define NO_SSP_SPEC "%{nostdlib|nodefaultlibs|ffreestanding:-fno-stack-protector} "
+#else
+#define NO_SSP_SPEC ""
+#endif
+
 #ifndef LINK_SSP_SPEC
 #ifdef TARGET_LIBC_PROVIDES_SSP
 #define LINK_SSP_SPEC "%{fstack-protector|fstack-protector-all" \
@@ -1131,7 +1148,7 @@ static const char *cc1_options =
  %{-version:--version}\
  %{-help=*:--help=%*}\
  %{!fsyntax-only:%{S:%W{o*}%{!o*:-o %b.s}}}\
- %{fsyntax-only:-o %j} %{-param*}\
+ %{fsyntax-only:-o %j} %{-param*} " NO_SSP_SPEC "\
  %{coverage:-fprofile-arcs -ftest-coverage}\
  %{fprofile-arcs|fprofile-generate*|coverage:\
    %{!fprofile-update=singel:\
--- a/gcc/params.def	2016-03-30 09:47:40.000000000 +0200
+++ b/gcc/params.def	2016-09-19 12:56:58.443179039 +0200
@@ -673,7 +673,7 @@ DEFPARAM (PARAM_INTEGER_SHARE_LIMIT,
 DEFPARAM (PARAM_SSP_BUFFER_SIZE,
 	  "ssp-buffer-size",
 	  "The lower bound for a buffer to be considered for stack smashing protection.",
-	  8, 1, 0)
+	  4, 1, 0)
 
 DEFPARAM (PARAM_MIN_SIZE_FOR_STACK_SHARING,
 	  "min-size-for-stack-sharing",
