From 545155616d8765fff91baf93c920662e217a03da Mon Sep 17 00:00:00 2001
From: Meco Man <920369182@qq.com>
Date: Sat, 6 Apr 2024 18:26:24 -0400
Subject: [PATCH] [iar] fix legacy macros will be added if cannot get the IAR
 version

---
 components/libc/compilers/dlib/SConscript | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/libc/compilers/dlib/SConscript b/components/libc/compilers/dlib/SConscript
index 98f664e8d9..51573b9e9a 100644
--- a/components/libc/compilers/dlib/SConscript
+++ b/components/libc/compilers/dlib/SConscript
@@ -13,7 +13,8 @@ if rtconfig.PLATFORM in ['iccarm']:
         from iar import IARVersion
 
         CPPDEFINES = CPPDEFINES + ['_DLIB_FILE_DESCRIPTOR']
-        if LooseVersion(IARVersion()) < LooseVersion("8.20.1"):
+        iar_version = LooseVersion(IARVersion())
+        if iar_version != LooseVersion("0.0") and iar_version < LooseVersion("8.20.1"):
             CPPDEFINES = CPPDEFINES + ['_DLIB_THREAD_SUPPORT']
 
     group = DefineGroup('Compiler', src, depend = [''], CPPDEFINES = CPPDEFINES)