include: Fix the C_ASSERT macro to not generate an unused variable warning when compiling with gcc.
Provide a fallback case for other compilers to avoid C_ASSERT being undefined and causing an error.
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@ -282,7 +282,9 @@ extern "C" {
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#if defined(_MSC_VER)
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# define C_ASSERT(e) typedef char __C_ASSERT__[(e)?1:-1]
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#elif defined(__GNUC__)
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# define C_ASSERT(e) extern char __C_ASSERT__[(e)?1:-1]
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# define C_ASSERT(e) extern char __C_ASSERT__[(e)?1:-1] __attribute__((unused))
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#else
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# define C_ASSERT(e)
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#endif
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/* Eliminate Microsoft C/C++ compiler warning 4715 */
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