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add -Wundef compiler flag, to catch typo in #if or similar situations
Originally committed as revision 16621 to svn://svn.ffmpeg.org/ffmpeg/trunk
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configure
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@ -2045,6 +2045,7 @@ check_cflags -Wno-pointer-sign
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check_cflags -Wcast-qual
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check_cflags -Wcast-qual
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check_cflags -Wwrite-strings
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check_cflags -Wwrite-strings
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check_cflags -Wtype-limits
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check_cflags -Wtype-limits
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check_cflags -Wundef
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enabled extra_warnings && check_cflags -Winline
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enabled extra_warnings && check_cflags -Winline
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# add some linker flags
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# add some linker flags
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