Ensure no macro leakage between .c files

Author: mintsuki

clzdi2.c

@@ -22,6 +22,9 @@
 // On 64-bit architectures with neither a native clz instruction nor a native
 // ctz instruction, gcc resolves __builtin_clz to __clzdi2 rather than
 // __clzsi2, leading to infinite recursion.
+#ifdef __builtin_clz
+#undef __builtin_clz
+#endif
 #define __builtin_clz(a) __clzsi2(a)
 extern int __clzsi2(si_int);
 #endif

ctzdi2.c

@@ -22,6 +22,9 @@
 // On 64-bit architectures with neither a native clz instruction nor a native
 // ctz instruction, gcc resolves __builtin_ctz to __ctzdi2 rather than
 // __ctzsi2, leading to infinite recursion.
+#ifdef __builtin_ctz
+#undef __builtin_ctz
+#endif
 #define __builtin_ctz(a) __ctzsi2(a)
 extern int __ctzsi2(si_int);
 #endif

udivdi3.c

@@ -16,7 +16,9 @@
 
 // Returns: a / b
 
+#ifdef
 #undef clz
+#endif
 #define clz(a) (sizeof(a) == sizeof(unsigned long long) ? __builtin_clzll(a) : clzsi(a))
 
 // Adapted from Figure 3-40 of The PowerPC Compiler Writer's Guide
@@ -47,3 +49,5 @@ COMPILER_RT_ABI du_int __udivdi3(du_int n, du_int d) {
   n = (n << 1) | carry;
   return n;
 }
+
+#undef clz

udivsi3.c

@@ -16,7 +16,9 @@
 
 // Returns: a / b
 
+#ifdef
 #undef clz
+#endif
 #define clz(a) (sizeof(a) == sizeof(unsigned long long) ? __builtin_clzll(a) : clzsi(a))
 
 // Adapted from Figure 3-40 of The PowerPC Compiler Writer's Guide
@@ -48,6 +50,8 @@ COMPILER_RT_ABI su_int __udivsi3(su_int n, su_int d) {
   return n;
 }
 
+#undef clz
+
 #if defined(__ARM_EABI__)
 COMPILER_RT_ALIAS(__udivsi3, __aeabi_uidiv)
 #endif

umoddi3.c

@@ -16,7 +16,9 @@
 
 // Returns: a % b
 
+#ifdef clz
 #undef clz
+#endif
 #define clz(a) (sizeof(a) == sizeof(unsigned long long) ? __builtin_clzll(a) : clzsi(a))
 
 // Mostly identical to __udivdi3 but the return values are different.
@@ -46,3 +48,5 @@ COMPILER_RT_ABI du_int __umoddi3(du_int n, du_int d) {
   }
   return r;
 }
+
+#undef clz

umodsi3.c

@@ -16,7 +16,9 @@
 
 // Returns: a % b
 
+#ifdef clz
 #undef clz
+#endif
 #define clz(a) (sizeof(a) == sizeof(unsigned long long) ? __builtin_clzll(a) : clzsi(a))
 
 // Mostly identical to __udivsi3 but the return values are different.
@@ -46,3 +48,5 @@ COMPILER_RT_ABI su_int __umodsi3(su_int n, su_int d) {
   }
   return r;
 }
+
+#undef clz