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pandora-build v0.103 - fix macros for cross-compiling. Fix stack direction check.

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m4/pandora_have_gcc_atomics.m4
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  AC_CACHE_CHECK(
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    [whether the compiler provides atomic builtins],
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    [ac_cv_gcc_atomic_builtins],
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    [AC_RUN_IFELSE(
 
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    [AC_LINK_IFELSE(
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      [AC_LANG_PROGRAM([],[[
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        int foo= -10; int bar= 10;
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        if (!__sync_fetch_and_add(&foo, bar) || foo)
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              [Define to 1 if compiler provides atomic builtins.])
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  ])
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])
 
 
b'\\ No newline at end of file'
 
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])