Index: lib/libc/mips/string/bcmp.S
===================================================================
--- lib/libc/mips/string/bcmp.S (revision 287720)
+++ lib/libc/mips/string/bcmp.S (working copy)
@@ -55,7 +55,14 @@
 
 LEAF(bcmp)
        .set    noreorder
-       blt             a2, 16, small   # is it worth any trouble?
+// clang doen't know how to do blt, manually do it for clang
+       .set    noat
+//     blt             a2, 16, small   # is it worth any trouble?
+       li              $1, 16
+       slt             $1, a2, $1 
+       bne             $1, $0, small
+       .set    at
+
        xor             v0, a0, a1      # compare low two bits of addresses
        and             v0, v0, 3
        PTR_SUBU        a3, zero, a1    # compute # bytes to word align address
Index: lib/libc/mips/string/bzero.S
===================================================================
--- lib/libc/mips/string/bzero.S        (revision 287720)
+++ lib/libc/mips/string/bzero.S        (working copy)
@@ -54,7 +54,12 @@
 
 LEAF(bzero)
        .set    noreorder
-       blt             a1, 3*SZREG, smallclr # small amount to clear?
+       .set    noat
+       //blt           a1, 3*SZREG, smallclr # small amount to clear?
+       li              $1, 3*SZREG
+       slt             $1, a1, $1
+       bne             $1, $0, smallclr
+       .set    at
        PTR_SUBU        a3, zero, a0    # compute # bytes to word align address
        and             a3, a3, SZREG-1
        beq             a3, zero, 1f    # skip if word aligned
Index: share/mk/src.opts.mk
===================================================================
--- share/mk/src.opts.mk        (revision 287720)
+++ share/mk/src.opts.mk        (working copy)
@@ -215,7 +215,7 @@
 __DEFAULT_YES_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX
 __DEFAULT_NO_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
 .elif ${__T} == "aarch64" || ${__T} == "amd64" || ${__TT} == "arm" || \
-    ${__T} == "i386"
+      ${__T} == "i386" || ${__T} == "mips" || ${__T} == "mips64"
 # On x86 and arm, clang is enabled, and will be installed as the default cc.
 __DEFAULT_YES_OPTIONS+=CLANG CLANG_BOOTSTRAP CLANG_FULL CLANG_IS_CC
 __DEFAULT_NO_OPTIONS+=GCC GCC_BOOTSTRAP GNUCXX