[llvm-commits] [PATCH] Teach cmake to detect the presence of Graphviz and friends

[Jakob Stoklund Olesen]

* Add a new cmake macro llvm_find_program that searches for a program  
and sets HAVE_FOO and LLVM_PATH_FOO variables.

* Use llvm_find_program to find Graphviz, dot, dotty, and gv.

* Add a few header file and symbol checks related to starting sub- 
processes and back traces.

* Update config.h.cmake to include new checks.

With this patch, llc built by cmake supports the -view-dag-* options  
and it can generate a stack trace on aborts.

Tested on Mac OS X 10.5.6 with cmake 2.6 generating makefiles

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