Add gcc-8.1.0 support to buildman toolchain.
The old gcc-7.3.0 has shared libraries issues on Ubuntu 18.04LTS and
19.04.
Though both 7.3.0 and 8.1.0 have arc and nds32 compilers, the following
errors were generated on Ubuntu 19.04.
arc: + iot_devkit
+arc-linux-ld.bfd: error: examples/standalone/hello_world: unable to merge CPU
base attributes ARC7xx with ARCEM.
+
+arc-linux-ld.bfd: failed to merge target specific data of file
/home/thomas/.buildman-toolchains/gcc-8.1.0-nolibc/arc-linux/bin/../lib/gcc/arc-linux/8.1.0/libgcc.a(_millicodethunk_st.o)
+arc-linux-ld.bfd: failed to merge target specific data of file
/home/thomas/.buildman-toolchains/gcc-8.1.0-nolibc/arc-linux/bin/../lib/gcc/arc-linux/8.1.0/libgcc.a(_millicodethunk_ret.o)
+make[3]: *** [examples/standalone/Makefile:62:
examples/standalone/hello_world] Error 1
+make[2]: *** [scripts/Makefile.build:432: examples/standalone] Error 2
+make[1]: *** [Makefile:1594: examples] Error 2
+make: *** [Makefile:148: sub-make] Error 2
nds32: + adp-ae3xx
+nds32le-elf-gcc: error: unrecognized command line option '-mno-ext-fpu-dp'
+nds32le-elf-gcc: error: unrecognized command line option '-mfloat-abi=soft'
+make[2]: *** [scripts/Makefile.autoconf:77: u-boot.cfg] Error 1
+make[1]: *** No rule to make target 'include/config/auto.conf', needed by
'include/config/uboot.release'. Stop.
+make: *** [Makefile:148: sub-make] Error 2
nds32: + adp-ag101p
+nds32le-elf-gcc: error: unrecognized command line option '-mno-ext-fpu-dp'
+nds32le-elf-gcc: error: unrecognized command line option '-mfloat-abi=soft'
+make[2]: *** [scripts/Makefile.autoconf:77: u-boot.cfg] Error 1
+make[1]: *** No rule to make target 'include/config/auto.conf', needed by
'include/config/uboot.release'. Stop.
+make: *** [Makefile:148: sub-make] Error 2
x86: + efi-x86_app
+{standard input}: Assembler messages:
+{standard input}:21695: Error: junk at end of line, first unrecognized
character is `@'
+{standard input}:21740: Error: junk at end of line, first unrecognized
character is `@'
+{standard input}:21695: Error: can't resolve `end.7382'
{.u_boot_list_2_fit_loadable_3 section} - `start.7379'
{.u_boot_list_2_fit_loadable_1 section}
+{standard input}:21740: Error: can't resolve `end.7382'
{.u_boot_list_2_fit_loadable_3 section} - `start.7379'
{.u_boot_list_2_fit_loadable_1 section}
+make[2]: *** [scripts/Makefile.build:279: common/image.o] Error 1
+make[1]: *** [Makefile:1594: common] Error 2
+make: *** [Makefile:148: sub-make] Error 2
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