feat(clang): refactor headers generation for clang

Clang assembler requires valid assembly; otherwise, an error is thrown.
Instead of using "->" as the token to parse for assembly macro defines,
we define the tokens "#", which is used for comments in assembly files.
The generated output will be valid for both clang and gcc.

Signed-off-by: Bruno Sa <[email protected]>

Author: ninolomata

src/lib/inc/util.h

@@ -34,10 +34,10 @@
 #ifndef __ASSEMBLER__
 
 #define DEFINE_OFFSET(SYMBOL, STRUCT, FIELD) \
-    __asm__ volatile("\n-> " XSTR(SYMBOL) " %0 \n" : : "i"(offsetof(STRUCT, FIELD)))
+    __asm__ volatile("\n##  " XSTR(SYMBOL) " %0 \n" : : "i"(offsetof(STRUCT, FIELD)))
 
 #define DEFINE_SIZE(SYMBOL, TYPE) \
-    __asm__ volatile("\n-> " XSTR(SYMBOL) " %0 \n" : : "i"(sizeof(TYPE)))
+    __asm__ volatile("\n##  " XSTR(SYMBOL) " %0 \n" : : "i"(sizeof(TYPE)))
 
 #define max(n1, n2) (((n1) > (n2)) ? (n1) : (n2))
 #define min(n1, n2) (((n1) < (n2)) ? (n1) : (n2))