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diff -Nrup a/libiberty/aclocal.m4 b/libiberty/aclocal.m4
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--- a/libiberty/aclocal.m4 2019-01-19 09:01:34.000000000 -0700
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+++ b/libiberty/aclocal.m4 2020-01-09 22:00:27.183312982 -0700
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@@ -147,7 +147,7 @@ if test $ac_cv_os_cray = yes; then
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fi
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AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
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-[AC_TRY_RUN([find_stack_direction ()
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+[AC_TRY_RUN([__attribute__ ((noclone,noinline)) find_stack_direction ()
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{
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static char *addr = 0;
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auto char dummy;
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diff --git a/config/intdiv0.m4 b/config/intdiv0.m4
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index 55dddcf1..ba906efc 100644
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--- a/config/intdiv0.m4
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+++ b/config/intdiv0.m4
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@@ -31,10 +31,10 @@ sigfpe_handler (sig) int sig;
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exit (sig != SIGFPE);
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}
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-int x = 1;
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-int y = 0;
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-int z;
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-int nan;
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+volatile int x = 1;
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+volatile int y = 0;
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+volatile int z;
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+volatile int nan;
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int main ()
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{
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diff --git a/libiberty/configure.ac b/libiberty/configure.ac
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index f1ce7601..fc20d228 100644
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--- a/libiberty/configure.ac
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+++ b/libiberty/configure.ac
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@@ -661,7 +661,7 @@ if test -z "${setobjs}"; then
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for v in $vars; do
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AC_MSG_CHECKING([for $v])
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AC_CACHE_VAL(libiberty_cv_var_$v,
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- [AC_LINK_IFELSE([AC_LANG_PROGRAM([[int *p;]],[[extern int $v []; p = $v;]])],
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+ [AC_LINK_IFELSE([AC_LANG_PROGRAM([[__attribute__ ((used)) int *p;]],[[extern int $v []; p = $v;]])],
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[eval "libiberty_cv_var_$v=yes"],
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[eval "libiberty_cv_var_$v=no"])])
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if eval "test \"`echo '$libiberty_cv_var_'$v`\" = yes"; then
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