diff -Nrup a/gcc-9.2.0/libiberty/aclocal.m4 b/libiberty/aclocal.m4

--- a/gcc-9.2.0/libiberty/aclocal.m4	2019-01-19 09:01:34.000000000 -0700

+++ b/gcc-9.2.0/libiberty/aclocal.m4	2020-01-09 22:00:27.183312982 -0700

@@ -147,7 +147,7 @@ if test $ac_cv_os_cray = yes; then

 fi

 AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,

-[AC_TRY_RUN([find_stack_direction ()

+[AC_TRY_RUN([__attribute__ ((noclone,noinline)) find_stack_direction ()

 {

   static char *addr = 0;

   auto char dummy;

diff --git a/config/intdiv0.m4 b/gcc-9.2.0/config/intdiv0.m4

index 55dddcf1..ba906efc 100644

--- a/gcc-9.2.0/config/intdiv0.m4

+++ b/gcc-9.2.0/config/intdiv0.m4

@@ -31,10 +31,10 @@ sigfpe_handler (sig) int sig;

   exit (sig != SIGFPE);

 }

-int x = 1;

-int y = 0;

-int z;

-int nan;

+volatile int x = 1;

+volatile int y = 0;

+volatile int z;

+volatile int nan;

 int main ()

 {

diff --git a/gcc-9.2.0/libiberty/configure.ac b/gcc-9.2.0/libiberty/configure.ac

index f1ce7601..fc20d228 100644

--- a/gcc-9.2.0/libiberty/configure.ac

+++ b/gcc-9.2.0/libiberty/configure.ac

@@ -661,7 +661,7 @@ if test -z "${setobjs}"; then

   for v in $vars; do

     AC_MSG_CHECKING([for $v])

     AC_CACHE_VAL(libiberty_cv_var_$v,

-      [AC_LINK_IFELSE([AC_LANG_PROGRAM([[int *p;]],[[extern int $v []; p = $v;]])],

+      [AC_LINK_IFELSE([AC_LANG_PROGRAM([[__attribute__ ((used)) int *p;]],[[extern int $v []; p = $v;]])],

 		      [eval "libiberty_cv_var_$v=yes"],

 		      [eval "libiberty_cv_var_$v=no"])])

     if eval "test \"`echo '$libiberty_cv_var_'$v`\" = yes"; then