[Webkit-unassigned] [Bug 117514] Too many XcodeCoverageSupportOptions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=117514





--- Comment #4 from Alexey Proskuryakov <ap at webkit.org>  2013-06-12 00:30:59 PST ---
> I'm not sure what the -MD flag does

Looks like a gcc option,

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-MD is equivalent to -M -MF file, except that -E is not implied. The driver determines file based on whether an -o option is given. If it is, the driver uses its argument but with a suffix of .d, otherwise it take the basename of the input file and applies a .d suffix.
If -MD is used in conjunction with -E, any -o switch is understood to specify the dependency output file (but see -MF), but if used without -E, each -o is understood to specify a target object file.

Since -E is not implied, -MD can be used to generate a dependency output file as a side-effect of the compilation process. 
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