diff --git a/gcc-config.patch b/gcc-config.patch
new file mode 100644
index 0000000..8456584
--- /dev/null
+++ b/gcc-config.patch
@@ -0,0 +1,44 @@
+diff -Nrup a/libiberty/aclocal.m4 b/libiberty/aclocal.m4
+--- a/libiberty/aclocal.m4	2019-01-19 09:01:34.000000000 -0700
++++ b/libiberty/aclocal.m4	2020-01-09 22:00:27.183312982 -0700
+@@ -147,7 +147,7 @@ if test $ac_cv_os_cray = yes; then
+ fi
+ 
+ AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
+-[AC_TRY_RUN([find_stack_direction ()
++[AC_TRY_RUN([__attribute__ ((noclone,noinline)) find_stack_direction ()
+ {
+   static char *addr = 0;
+   auto char dummy;
+diff --git a/config/intdiv0.m4 b/config/intdiv0.m4
+index 55dddcf1..ba906efc 100644
+--- a/config/intdiv0.m4
++++ b/config/intdiv0.m4
+@@ -31,10 +31,10 @@ sigfpe_handler (sig) int sig;
+   exit (sig != SIGFPE);
+ }
+ 
+-int x = 1;
+-int y = 0;
+-int z;
+-int nan;
++volatile int x = 1;
++volatile int y = 0;
++volatile int z;
++volatile int nan;
+ 
+ int main ()
+ {
+diff --git a/libiberty/configure.ac b/libiberty/configure.ac
+index f1ce7601..fc20d228 100644
+--- a/libiberty/configure.ac
++++ b/libiberty/configure.ac
+@@ -661,7 +661,7 @@ if test -z "${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
diff --git a/ghdl.spec b/ghdl.spec
index e6a6d9b..d441b9e 100644
--- a/ghdl.spec
+++ b/ghdl.spec
@@ -40,7 +40,7 @@
 Summary: A VHDL simulator, using the GCC technology
 Name: ghdl
 Version: %{ghdlver}
-Release: 5.%{ghdlgitrev}%{?dist}
+Release: 6.%{ghdlgitrev}%{?dist}
 License: GPLv2+ and GPLv3+ and GPLv3+ with exceptions and GPLv2+ with exceptions and LGPLv2+ and BSD
 URL: http://ghdl.free.fr/
 # The source for this package was pulled from upstream's vcs.  Use the
@@ -71,6 +71,8 @@ Patch100: ghdl-llvmflags.patch
 Patch106: ghdl-ppc64abort.patch
 Requires: gcc
 
+Patch200: gcc-config.patch
+
 BuildRequires: binutils >= 2.31
 BuildRequires: zlib-devel, gettext, bison, flex
 BuildRequires: texinfo
@@ -201,6 +203,14 @@ that tracks signal updates and schedules processes.
 %patch10 -p0 -b .rh1574936~
 %endif
 
+%patch200 -p1
+pushd libiberty
+autoconf -f
+popd
+pushd intl
+autoconf -f
+popd
+
 echo 'Red Hat %{version}-%{gcc_release}' > gcc/DEV-PHASE
 
 cp -a libstdc++-v3/config/cpu/i{4,3}86/atomicity.h
@@ -517,6 +527,9 @@ rm %{buildroot}/usr/lib/libghdl.{a,link}
 %endif
 
 %changelog
+* Mon Jul 20 2020 Jeff Law <law@redhat.com> - 0.38~dev-6.20200702git9828b51
+- Fix broken configure tests compromised by LTO
+
 * Fri Jul 03 2020 Dan Horák <dan[at]danny.cz> - 0.38~dev-5.20200702git9828b51
 - updated to new ghdl snapshot