原始版本

RT_Thread/components/libc/Kconfig

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+menu "C/C++ and POSIX layer"
+
+config RT_USING_EXTERNAL_LIBC
+    bool
+    help
+        This is for external libc(e.g. mlib),
+        and NOT for newlib or picolibc which are inherent in the toolchains.
+        Usually, the external libc should be a software package and select
+        RT_USING_EXTERNAL_LIBC in software package's Kconfig
+        This option is not available for users to select.
+
+rsource "compilers/common/Kconfig"
+rsource "posix/Kconfig"
+rsource "cplusplus/Kconfig"
+
+endmenu