/usr/src/gcc-8/debian/patches/arm-multilib-soft-float.diff is in gcc-8-source 8-20180414-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | --- a/src/gcc/config/arm/t-linux-eabi
+++ b/src/gcc/config/arm/t-linux-eabi
@@ -24,6 +24,23 @@
MULTILIB_OPTIONS =
MULTILIB_DIRNAMES =
+ifneq (,$(findstring MULTIARCH_DEFAULTS,$(tm_defines)))
+ifneq (,$(findstring __arm_linux_gnueabi__,$(tm_defines)))
+ MULTILIB_OPTIONS = mfloat-abi=softfp/mfloat-abi=hard/mfloat-abi=soft
+ MULTILIB_DIRNAMES = . hf soft-float
+ MULTILIB_EXCEPTIONS =
+ MULTILIB_MATCHES = mfloat-abi?hard=mhard-float mfloat-abi?soft=msoft-float
+ MULTILIB_OSDIRNAMES = ../../lib/arm-linux-gnueabi ../../lib/arm-linux-gnueabihf soft-float
+endif
+ifneq (,$(findstring __arm_linux_gnueabihf__,$(tm_defines)))
+ MULTILIB_OPTIONS = mfloat-abi=hard/mfloat-abi=softfp/mfloat-abi=soft
+ MULTILIB_DIRNAMES = . sf soft-float
+ MULTILIB_EXCEPTIONS =
+ MULTILIB_MATCHES = mfloat-abi?hard=mhard-float mfloat-abi?soft=msoft-float
+ MULTILIB_OSDIRNAMES = ../../lib/arm-linux-gnueabihf ../../lib/arm-linux-gnueabi soft-float
+endif
+endif
+
#MULTILIB_OPTIONS += mcpu=fa606te/mcpu=fa626te/mcpu=fmp626/mcpu=fa726te
#MULTILIB_DIRNAMES += fa606te fa626te fmp626 fa726te
#MULTILIB_EXCEPTIONS += *mthumb/*mcpu=fa606te *mthumb/*mcpu=fa626te *mthumb/*mcpu=fmp626 *mthumb/*mcpu=fa726te*
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