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by khuey
4769 days ago
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The problem is link time code generation. With link time optimization[0], which is a prerequisite for profile guided optimization, cl just compiles the source into some intermediate representation. Actual code generation is all done in link.exe at the final link. And /machine:x86 doesn't work with link.exe when using -GL. The x64 link.exe is not capable of generating x86 binaries with LTO. [0] http://msdn.microsoft.com/en-us/library/0zza0de8%28v=vs.100%... (Mozilla is building with 2010 now.) |
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Also note that the problem still exists in VS2012, and in fact is even worse because the linker memory usage has gotten higher in general. Fortunately we now have a fairly good workaround (developed with help from Microsoft -- maybe some of the people in this thread?) that limits which files participate in PGO:
https://bugzilla.mozilla.org/show_bug.cgi?id=871712