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Description: Phusion Passenger (mod_rails)
Homepage: http://www.modrails.com/
Clone URL: git://github.com/FooBarWidget/passenger.git
Click here to lend your support to: passenger and make a donation at www.pledgie.com ! 
Do not use GCC __sync spinlocks if GCC version is less than 4.1. This 
fixes a compilation problem on Ubuntu 6.06 LTS.
Hongli Lai (Phusion (author)
Fri Jul 18 03:22:37 -0700 2008
commit  e3c8a5328a5838e32ffed49d37f5fd411b15b002
tree    9be35a761083fcffad874c636d03aaa15001dbfc
parent  4b4841be737d40dbda9f5750065d576cd8475b69
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ext/oxt/spin_lock.hpp 
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@@ -33,7 +33,16 @@
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   #define OXT_NO_PTHREAD_SPINLOCKS
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 #endif
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-#if ((__GNUC__ >= 4) && defined(__i386__)) || defined(IN_DOXYGEN)
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+#ifndef GCC_VERSION
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+	#define GCC_VERSION (__GNUC__ * 10000 \
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+	                     + __GNUC_MINOR__ * 100 \
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+	                     + __GNUC_PATCH_LEVEL__)
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+#endif
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+
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+#if (GCC_VERSION > 40100 && defined(__i386__)) || defined(IN_DOXYGEN)
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+	// GCC 4.0 doesn't support __sync instructions while GCC 4.2
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+	// does. I'm not sure whether support for it started in 4.1 or
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+	// 4.2, so the above version check may have to be changed later.
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   #include "detail/spin_lock_gcc_x86.hpp"
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 #elif !defined(WIN32) && !defined(OXT_NO_PTHREAD_SPINLOCKS)
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   #include "detail/spin_lock_pthreads.hpp"

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