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Gentoo Bug: https://bugs.gentoo.org/show_bug.cgi?id=542676
https://svnweb.freebsd.org/base/head/sys/boot/i386/boot2/Makefile?r1=272249&r2=276479
diff --git a/sys/boot/i386/boot2/Makefile b/sys/boot/i386/boot2/Makefile
index 8a6e771..c030853 100644
--- a/sys/boot/i386/boot2/Makefile
+++ b/sys/boot/i386/boot2/Makefile
@@ -22,8 +22,7 @@ BOOT2_UFS?= UFS1_AND_UFS2
#BOOT2_UFS?= UFS2_ONLY
#BOOT2_UFS?= UFS1_ONLY
-CFLAGS= -Os \
- -fomit-frame-pointer \
+CFLAGS= -fomit-frame-pointer \
-mrtd \
-mregparm=3 \
-DUSE_XREAD \
@@ -40,7 +39,10 @@ CFLAGS= -Os \
-Winline \
${CLANG_OPT_SMALL}
-CFLAGS.gcc+= -fno-guess-branch-probability \
+CFLAGS.clang+= -Oz
+
+CFLAGS.gcc+= -Os \
+ -fno-guess-branch-probability \
-fno-unit-at-a-time \
--param max-inline-insns-single=100
.if ${COMPILER_TYPE} == "gcc" && ${COMPILER_VERSION} <= 40201
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