tunes: set valid clang tune for big.LITTLE Arm SoCs

clang doesn't have Arm big.LITTLE specific tune options - when such an option is used,
the compilation fails with an error like this:

aarch64-poky-linux-clang: error: unsupported argument 'cortex-a72.cortex-a53+crc+crypto' to option '-mcpu='

To avoid this, in case a big.LITTLE SoC is the target and the toolchain is clang, select
the tune corresponding to the LITTLE core.

(From OE-Core rev: 12c820f624730a04a17ae2cdbecc4e6987c45cf7)

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 10 insertions, 2 deletions

diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
index e18b2cb6e0..6b9b541f9a 100644
--- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
+++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa75-cortexa55.inc
@@ -5,7 +5,11 @@ DEFAULTTUNE                                        ?= "cortexa75-cortexa55"
 
 TUNEVALID[cortexa75-cortexa55] = "Enable big.LITTLE Cortex-A75.Cortex-A55 specific processor optimizations"
 MACHINEOVERRIDES =. "${@bb.utils.contains("TUNE_FEATURES", "cortexa75-cortexa55", "cortexa75-cortexa55:", "", d)}"
-TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "cortexa75-cortexa55", " -mcpu=cortex-a75.cortex-a55", "", d)}"
+
+CPU_TUNE_ARG = "cortex-a75.cortex-a55"
+# clang doesn't support big.LITTLE tunes, select the LITTLE tune
+CPU_TUNE_ARG:toolchain-clang = "cortex-a55"
+TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "cortexa75-cortexa55", " -mcpu=${CPU_TUNE_ARG}", "", d)}"
 
 require conf/machine/include/arm/arch-armv8-2a.inc
 
diff --git a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
index 7daf9d91a8..8195782cd9 100644
--- a/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
+++ b/meta/conf/machine/include/arm/armv8-2a/tune-cortexa76-cortexa55.inc
@@ -5,7 +5,11 @@ DEFAULTTUNE                                        ?= "cortexa76-cortexa55"
 
 TUNEVALID[cortexa76-cortexa55] = "Enable big.LITTLE Cortex-A76.Cortex-A55 specific processor optimizations"
 MACHINEOVERRIDES =. "${@bb.utils.contains("TUNE_FEATURES", "cortexa76-cortexa55", "cortexa76-cortexa55:", "", d)}"
-TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "cortexa76-cortexa55", " -mcpu=cortex-a76.cortex-a55", "", d)}"
+
+CPU_TUNE_ARG = "cortex-a76.cortex-a55"
+# clang doesn't support big.LITTLE tunes, select the LITTLE tune
+CPU_TUNE_ARG:toolchain-clang = "cortex-a55"
+TUNE_CCARGS .= "${@bb.utils.contains("TUNE_FEATURES", "cortexa76-cortexa55", " -mcpu=${CPU_TUNE_ARG}", "", d)}"
 
 require conf/machine/include/arm/arch-armv8-2a.inc