YACC as bison -y. In this way, we ensure that bison is being used, but
the Makefiles have macros for using bison itself and for getting bison to
act like it is traditional yacc.
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directory.
Added Makefile.spec to the list of files to copy to the object directory.
Moved the configuration of $SourceDir to Makefile.config and corrected the
conditional that surrounds it. This allows SPEC to reset it and get the correct
VPATH.
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Moved Makefile.common to Makefile.rules. This makes project Makefiles easier
to support, and allows for easier overriding of default configuration values
that used to be in Makefile.common.
Modified Makefile.config.in to determine paths for directories (like
LLVM_SRC_ROOT) and to use the pwd binary as opposed to the shell builtin (this
works better for symbolic links).
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up the test suite. Since all the LLVM software assumes that config.h exists,
we can just do away with it for now.
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variables instead of overwriting those variables. This makes it more flexible
and keeps some of the test Makefiles from breaking.
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