--- gcc-7.5.0/gcc/config/i386/t-rtems.orig	2020-09-18 21:48:24.361658142 -0700
+++ gcc-7.5.0/gcc/config/i386/t-rtems	2020-09-18 21:49:27.936631185 -0700
@@ -17,10 +17,10 @@
 # <http://www.gnu.org/licenses/>.
 #
 
-MULTILIB_OPTIONS = mtune=i486/mtune=pentium/mtune=pentiumpro msoft-float
+MULTILIB_OPTIONS = march=i486/march=pentium/march=pentiumpro msoft-float
 MULTILIB_DIRNAMES= m486 mpentium mpentiumpro soft-float
 MULTILIB_MATCHES = msoft-float=mno-80387
-MULTILIB_MATCHES += mtune?pentium=mtune?k6 mtune?pentiumpro=mtune?athlon
+MULTILIB_MATCHES += march?pentium=march?k6 march?pentiumpro=march?athlon
 MULTILIB_EXCEPTIONS = \
-mtune=pentium/*msoft-float* \
-mtune=pentiumpro/*msoft-float*
+march=pentium/*msoft-float* \
+march=pentiumpro/*msoft-float*