[PATCH v4 3/3] riscv: override machine_args only when default

[uk7b at foxmail.com]

From: Sun Yuechi <sunyuechi at iscas.ac.cn>

Support using -Dcpu_instruction_set=rv64gcv to enable V extension.

Signed-off-by: Sun Yuechi <sunyuechi at iscas.ac.cn>
---
 config/riscv/meson.build | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/config/riscv/meson.build b/config/riscv/meson.build
index e3694cf2e6..1036a86d05 100644
--- a/config/riscv/meson.build
+++ b/config/riscv/meson.build
@@ -111,6 +111,7 @@ arch_config = arch_config[arch_id]
 # Concatenate flags respecting priorities.
 dpdk_flags = flags_common + vendor_config['flags'] + arch_config.get('flags', [])
 
+if (cpu_instruction_set == 'rv64gc')
 # apply supported machine args
 machine_args = [] # Clear previous machine args
 foreach flag: arch_config['machine_args']
@@ -118,6 +119,7 @@ foreach flag: arch_config['machine_args']
         machine_args += flag
     endif
 endforeach
+endif
 
 # check if we can do buildtime detection of extensions supported by the target
 riscv_extension_macros = false
-- 
2.49.0