On Sun, 17 Apr 2011 14:02:02 +0200, Christian wrote in message <20110417120036.a62241318...@mail.sigmos.de>:
> Christian Schmitt wrote: > > > After that genapts segfaulted during EGKK processing and right > > until now I have still not much of a clue what exactly is going on. > > I thought it was a problem with compiling TG against SG and not > > SG-CS (all from GIT). That showed to be wrong. Next guess was > > overoptimization (-O2 and -march), yet unsetting this and > > recompiling did not solve it either. > > After recompiling simgear and terragear multiple times with different > cflags i guess I found out what is the problem: the use of sse/sse2 > instructions by gcc. Here is a diff output of the internal GCC > options between a non-working config and a working one: > > #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1 > #define __DBL_DENORM_MIN__ 4.9406564584124654e-324 > #define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1 > -#define __FLT_EVAL_METHOD__ 0 > +#define __FLT_EVAL_METHOD__ 2 > #define __unix__ 1 > #define __DBL_MIN_10_EXP__ (-307) > #define __FINITE_MATH_ONLY__ 0 > @@ -51,7 +51,6 @@ > #define __DEC32_MIN__ 1E-95DF > #define __DBL_MAX_EXP__ 1024 > #define __DEC128_EPSILON__ 1E-33DL > -#define __SSE2_MATH__ 1 > #define __LONG_LONG_MAX__ 9223372036854775807LL > #define __SIZEOF_SIZE_T__ 4 > #define __SIZEOF_WINT_T__ 4 > @@ -73,7 +72,6 @@ > #define __ELF__ 1 > #define __FLT_RADIX__ 2 > #define __LDBL_EPSILON__ 1.08420217248550443401e-19L > -#define __SSE_MATH__ 1 > #define __SIZEOF_PTRDIFF_T__ 4 > #define __DEC32_SUBNORMAL_MIN__ 0.000001E-95DF > #define __FLT_HAS_QUIET_NAN__ 1 > > I encountered this problem on an Atom-based machine and an AMD Phenom > machine. So, yes, I should probably change my cflags in this case. > But given many distros that will ship this as binary package > (compiled with SSE instructions enabled), the better way would be to > fix it in the code. ..who's code, F|S|TG, or GCC? Which gcc version(s) did you use here? Debian has updated gcc-4.4 and gcc-4.6 yesterday and today, may be updating gcc-4.5 now if they didn't earlier this week, so it could well be the bug you've found, is being fixed, or has been fixed by now. -- ..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. ------------------------------------------------------------------------------ Benefiting from Server Virtualization: Beyond Initial Workload Consolidation -- Increasing the use of server virtualization is a top priority.Virtualization can reduce costs, simplify management, and improve application availability and disaster protection. Learn more about boosting the value of server virtualization. http://p.sf.net/sfu/vmware-sfdev2dev _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
