Fix Clang error when disabling Zicsr

eleanorLYJ · eleanorLYJ · commit b1b92af37f52 · 2025-01-13T13:11:05.000+08:00
When using 'make ENABLE_Zicsr=0 CC=clang', the following error is
observed:

src/emulate.c:83:20: error: unused function 'update_time' [-Werror,-Wunused-function]
   83 | static inline void update_time(riscv_t *rv)
      |                    ^~~~~~~~~~~
1 error generated

Fix this by guarding the update_time function definition with
RV32_HAS(Zicsr) macro. This ensures the function is only defined
when the Zicsr is enabled.
diff --git a/src/emulate.c b/src/emulate.c
@@ -79,12 +79,14 @@ static void __trap_handler(riscv_t *rv);
     }
 
 /* FIXME: use more precise methods for updating time, e.g., RTC */
+#if RV32_HAS(Zicsr)
 static uint64_t ctr = 0;
 static inline void update_time(riscv_t *rv)
 {
     rv->csr_time[0] = ctr & 0xFFFFFFFF;
     rv->csr_time[1] = ctr >> 32;
 }
+#endif
 
 #if RV32_HAS(Zicsr)
 /* get a pointer to a CSR */

Original file line number	Diff line number	Diff line change
`@@ -79,12 +79,14 @@ static void __trap_handler(riscv_t *rv);`
`79`	`79`	`}`
`80`	`80`
`81`	`81`	`/* FIXME: use more precise methods for updating time, e.g., RTC */`
	`82`	`+#if RV32_HAS(Zicsr)`
`82`	`83`	`static uint64_t ctr = 0;`
`83`	`84`	`static inline void update_time(riscv_t *rv)`
`84`	`85`	`{`
`85`	`86`	`rv->csr_time[0] = ctr & 0xFFFFFFFF;`
`86`	`87`	`rv->csr_time[1] = ctr >> 32;`
`87`	`88`	`}`
	`89`	`+#endif`
`88`	`90`
`89`	`91`	`#if RV32_HAS(Zicsr)`
`90`	`92`	`/* get a pointer to a CSR */`