When -march=native is passed to host_detect_local_cpu to the backend, it overrides all command lines after it. That means
$ gcc -march=native -march=armv8-a is treated as $ gcc -march=armv8-a -march=native Prune joined switches with Negative and RejectNegative to allow -march=armv8-a to override previous -march=native on command-line. This is the same fix as was applied for i386 in SVN revision 269164 but for aarch64 and arm. gcc/ PR driver/69471 * config/aarch64/aarch64.opt (march=): Add Negative(march=). (mtune=): Add Negative(mtune=). * config/arm/arm.opt: Likewise. --- gcc/config/aarch64/aarch64.opt | 5 +++-- gcc/config/arm/arm.opt | 4 ++-- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt index 865b6a6d8ca..908dca23b3c 100644 --- a/gcc/config/aarch64/aarch64.opt +++ b/gcc/config/aarch64/aarch64.opt @@ -119,7 +119,8 @@ EnumValue Enum(aarch64_tls_size) String(48) Value(48) march= -Target RejectNegative ToLower Joined Var(aarch64_arch_string) +Target RejectNegative Negative(march=) ToLower Joined Var(aarch64_arch_string) + Use features of architecture ARCH. mcpu= @@ -127,7 +128,7 @@ Target RejectNegative ToLower Joined Var(aarch64_cpu_string) Use features of and optimize for CPU. mtune= -Target RejectNegative ToLower Joined Var(aarch64_tune_string) +Target RejectNegative Negative(mtune=) ToLower Joined Var(aarch64_tune_string) Optimize for CPU. mabi= diff --git a/gcc/config/arm/arm.opt b/gcc/config/arm/arm.opt index 452f0cf6d67..e3ead5c95d1 100644 --- a/gcc/config/arm/arm.opt +++ b/gcc/config/arm/arm.opt @@ -82,7 +82,7 @@ mapcs-stack-check Target Report Mask(APCS_STACK) Undocumented march= -Target RejectNegative ToLower Joined Var(arm_arch_string) +Target RejectNegative Negative(march=) ToLower Joined Var(arm_arch_string) Specify the name of the target architecture. ; Other arm_arch values are loaded from arm-tables.opt @@ -232,7 +232,7 @@ Target Report Mask(TPCS_LEAF_FRAME) Thumb: Generate (leaf) stack frames even if not needed. mtune= -Target RejectNegative ToLower Joined Var(arm_tune_string) +Target RejectNegative Negative(mtune=) ToLower Joined Var(arm_tune_string) Tune code for the given processor. mprint-tune-info -- 2.21.0