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It seems gcc-4.4 uses external calls.
Index: source/common/putilimp.h
===================================================================
--- source/common/putilimp.h (revision 43491)
+++ source/common/putilimp.h (working copy)
@@ -193,7 +193,7 @@
/* Use the predefined value. */
#elif U_PLATFORM == U_PF_MINGW
#define U_HAVE_GCC_ATOMICS 0
-#elif U_GCC_MAJOR_MINOR >= 404 || defined(__clang__)
+#elif U_GCC_MAJOR_MINOR >= 405 || defined(__clang__)
/* TODO: Intel icc and IBM xlc on AIX also support gcc atomics. (Intel originated them.)
* Add them for these compilers.
* Note: Clang sets __GNUC__ defines for version 4.2, so misses the 4.4 test here.
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