libm/newlib: add newlib/libm support

Signed-off-by: yanghuatao <yanghuatao@xiaomi.com>

tools/Config.mk

@@ -656,6 +656,12 @@ else
     ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include$(DELIM)etl
   endif
 endif
+
+ifeq ($(CONFIG_LIBM_NEWLIB),y)
+  ARCHINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)newlib$(DELIM)include
+  ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)newlib$(DELIM)include
+endif
+
 ARCHXXINCLUDES += ${INCSYSDIR_PREFIX}$(TOPDIR)$(DELIM)include
 
 # Convert filepaths to their proper system format (i.e. Windows/Unix)

tools/nxstyle.c

@@ -243,6 +243,10 @@ static const char *g_white_list[] =
 
   "_Atomic",
 
+  /* Ref:  https://en.cppreference.com/w/c/keyword/_Thread_local */
+
+  "_Thread_local",
+
   /* Ref:  unwind-arm-common.h */
 
   "_Unwind",