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/usr/src/gcc-5/debian/patches/mips-fix-loongson2f-nop.diff is in gcc-5-source 5.3.1-14ubuntu2.

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# DP: On mips, pass -mfix-loongson2f-nop to as, if -mno-fix-loongson2f-nop
# DP: is not passed.

Index: b/src/gcc/config/mips/mips.h
===================================================================
--- a/src/gcc/config/mips/mips.h
+++ b/src/gcc/config/mips/mips.h
@@ -1343,6 +1343,7 @@ struct mips_cpu_info {
 %{msym32} %{mno-sym32} \
 %{mtune=*}" \
 FP_ASM_SPEC "\
+%{!mno-fix-loongson2f-nop:-mfix-loongson2f-nop} \
 %(subtarget_asm_spec)"
 
 /* Extra switches sometimes passed to the linker.  */