support/config-fragments/autobuild: use Bootlin toolchain for Xtensa uclibc

Instead of using an external toolchain built specifically for the
autobuilders to test Xtensa/uclibc, use a pre-built Bootlin toolchain.

To be noted: that fragment was in fact already using a Bootlin
bleeding-edge toolchain, because BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y is
missing from the fragment:

    $ cat support/config-fragments/autobuild/br-xtensa-full.config >.config

    $ make olddefconfig

    $ grep BOOTLIN .config
    BR2_TOOLCHAIN_EXTERNAL_BOOTLIN=y
    BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_ARCH_SUPPORTS=y
    BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_XTENSA_LX60_UCLIBC_BLEEDING_EDGE=y
    # BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_XTENSA_LX60_UCLIBC_STABLE is not set

The original fragment was supposed to use a stable toolchain, so we
switch to explictly use a stable Bootlin toolchain.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
[yann.morin.1998@free.fr:
  - add blurb about missing BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/config-fragments/autobuild/bootlin-xtensa-uclibc.config

@@ -0,0 +1,3 @@
+BR2_xtensa=y
+BR2_TOOLCHAIN_EXTERNAL=y
+BR2_TOOLCHAIN_EXTERNAL_BOOTLIN_XTENSA_LX60_UCLIBC_STABLE=y

support/config-fragments/autobuild/br-xtensa-full.config

@@ -1,9 +0,0 @@
-BR2_xtensa=y
-BR2_TOOLCHAIN_EXTERNAL=y
-BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
-BR2_TOOLCHAIN_EXTERNAL_URL="http://autobuild.buildroot.org/toolchains/tarballs/br-xtensa-full-2020.02.tar.bz2"
-BR2_TOOLCHAIN_EXTERNAL_GCC_8=y
-BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_4=y
-BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
-# BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG is not set
-BR2_TOOLCHAIN_EXTERNAL_CXX=y

support/config-fragments/autobuild/toolchain-configs.csv

@@ -42,6 +42,7 @@ support/config-fragments/autobuild/bootlin-sparc-uclibc.config,x86_64
 support/config-fragments/autobuild/bootlin-sparc64-glibc.config,x86_64
 support/config-fragments/autobuild/bootlin-x86-64-glibc.config,x86_64
 support/config-fragments/autobuild/bootlin-x86-64-uclibc.config,x86_64
+support/config-fragments/autobuild/bootlin-xtensa-uclibc.config,x86_64
 support/config-fragments/autobuild/br-arc-full-internal.config,any
 support/config-fragments/autobuild/br-arc-internal-glibc.config,any
 support/config-fragments/autobuild/br-arm-basic.config,x86_64
@@ -61,7 +62,6 @@ support/config-fragments/autobuild/br-riscv64.config,x86_64
 support/config-fragments/autobuild/br-riscv64-full-internal.config,any
 support/config-fragments/autobuild/br-riscv64-musl.config,x86_64
 support/config-fragments/autobuild/br-s390x-z13-internal-glibc.config,any
-support/config-fragments/autobuild/br-xtensa-full.config,x86_64
 support/config-fragments/autobuild/br-xtensa-full-internal.config,any
 support/config-fragments/autobuild/linaro-aarch64.config,x86
 support/config-fragments/autobuild/linaro-aarch64-be.config,x86