toolchain: Update to GCC 8.3 and update kernel headers

In the GCC v8.2-2018.08 toolchain (previous default in OP-TEE) the
GDB/TUI mode was disabled, which made debugging using GDB slightly more
complicated. However, in more recent versions of GCC like the one
introduced here, i.e., GCC8.3-2019.03, Arm have re-enabled the TUI mode.

But to be able to upgrade the toolchain, one must also step up kernel
headers so that the toolchain matches the kernel headers used by
Buildroot. This means that we are stepping up from 4.18 kernel headers
to 4.19 kernel headers, which seems to be compatible with the version of
GCC that is being introduced in this patch.

Note that after this commit, older GCC versions will not work any
longer when building full OP-TEE developer setups using OP-TEE's
manifest.git and build.git, i.e., trying to run GCC8.2 for example will
give a kernel header mismatch error.

Fixes #334.

Signed-off-by: Joakim Bech <joakim.bech@linaro.org>
Tested-by: Joakim Bech <joakim.bech@linaro.org> (QEMU v7, v8)
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>

br-ext/configs/toolchain-aarch32

@@ -3,7 +3,7 @@ BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
 BR2_TOOLCHAIN_EXTERNAL_PATH="%TOP_DIR%/toolchains/aarch32"
 BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="arm-linux-gnueabihf"
 BR2_TOOLCHAIN_EXTERNAL_GCC_8=y
-BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_18=y
+BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_19=y
 BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
 BR2_TOOLCHAIN_EXTERNAL_CXX=y
 

br-ext/configs/toolchain-aarch64

@@ -3,7 +3,7 @@ BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
 BR2_TOOLCHAIN_EXTERNAL_PATH="%TOP_DIR%/toolchains/aarch64"
 BR2_TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX="aarch64-linux-gnu"
 BR2_TOOLCHAIN_EXTERNAL_GCC_8=y
-BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_18=y
+BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_19=y
 BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
 BR2_TOOLCHAIN_EXTERNAL_CXX=y
 

toolchain.mk

@@ -6,13 +6,13 @@ TOOLCHAIN_ROOT 			?= $(ROOT)/toolchains
 
 AARCH32_PATH 			?= $(TOOLCHAIN_ROOT)/aarch32
 AARCH32_CROSS_COMPILE 		?= $(AARCH32_PATH)/bin/arm-linux-gnueabihf-
-AARCH32_GCC_VERSION 		?= gcc-arm-8.2-2018.08-x86_64-arm-linux-gnueabihf
-SRC_AARCH32_GCC 		?= https://developer.arm.com/-/media/Files/downloads/gnu-a/8.2-2018.08/${AARCH32_GCC_VERSION}.tar.xz
+AARCH32_GCC_VERSION 		?= gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf
+SRC_AARCH32_GCC 		?= https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/${AARCH32_GCC_VERSION}.tar.xz
 
 AARCH64_PATH 			?= $(TOOLCHAIN_ROOT)/aarch64
 AARCH64_CROSS_COMPILE 		?= $(AARCH64_PATH)/bin/aarch64-linux-gnu-
-AARCH64_GCC_VERSION 		?= gcc-arm-8.2-2018.08-x86_64-aarch64-linux-gnu
-SRC_AARCH64_GCC 		?= https://developer.arm.com/-/media/Files/downloads/gnu-a/8.2-2018.08/${AARCH64_GCC_VERSION}.tar.xz
+AARCH64_GCC_VERSION 		?= gcc-arm-8.3-2019.03-x86_64-aarch64-linux-gnu
+SRC_AARCH64_GCC 		?= https://developer.arm.com/-/media/Files/downloads/gnu-a/8.3-2019.03/binrel/${AARCH64_GCC_VERSION}.tar.xz
 
 # Download toolchain macro for saving some repetition
 # $(1) is $AARCH.._PATH		: i.e., path to the destination