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63 lines
1.2 KiB
63 lines
1.2 KiB
12 years ago
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diff --git a/libpcc/bitcnt.c b/libpcc/bitcnt.c
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index 26ecc01..c3bd54e 100644
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--- a/libpcc/bitcnt.c
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+++ b/libpcc/bitcnt.c
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@@ -1,9 +1,22 @@
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+// Only use __has_builtin in compilers that support it.
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+#ifndef __has_builtin
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+ #define __has_builtin(x) 0
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+#endif
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+#if !__has_builtin(__builtin_clz)
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int __builtin_clz(unsigned int);
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+#endif
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+#if !__has_builtin(__builtin_ctz)
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int __builtin_ctz(unsigned int);
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+#endif
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+#if !__has_builtin(__builtin_clzl)
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int __builtin_clzl(unsigned long);
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+#endif
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+#if !__has_builtin(__builtin_ctzl)
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int __builtin_ctzl(unsigned long);
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+#endif
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+#if !__has_builtin(__builtin_clz)
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int
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__builtin_clz(unsigned int v)
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{
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@@ -14,7 +27,9 @@ __builtin_clz(unsigned int v)
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break;
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return i;
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}
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+#endif
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+#if !__has_builtin(__builtin_ctz)
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int
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__builtin_ctz(unsigned int v)
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{
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@@ -25,7 +40,9 @@ __builtin_ctz(unsigned int v)
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break;
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return i;
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}
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+#endif
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+#if !__has_builtin(__builtin_clzl)
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int
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__builtin_clzl(unsigned long v)
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{
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@@ -37,7 +54,9 @@ __builtin_clzl(unsigned long v)
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break;
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return i;
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}
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+#endif
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+#if !__has_builtin(__builtin_ctzl)
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int
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__builtin_ctzl(unsigned long v)
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{
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@@ -48,3 +67,4 @@ __builtin_ctzl(unsigned long v)
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break;
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return i;
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}
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+#endif
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