Bug Report: Missing Library Include

[mgdickerson]

When trying to build the project (on master and main branch) using LLVM 12 and the given directions, the following error occurs:

Scanning dependencies of target pdg_shared
[  3%] Building CXX object CMakeFiles/pdg_shared.dir/src/CallWrapper.cpp.o
[  7%] Building CXX object CMakeFiles/pdg_shared.dir/src/ControlDependencyGraph.cpp.o
[ 11%] Building CXX object CMakeFiles/pdg_shared.dir/src/DataDependencyGraph.cpp.o
In file included from /root/program-dependence-graph/src/DataDependencyGraph.cpp:1:
/root/program-dependence-graph/include/DataDependencyGraph.hh:21:11: error: ‘AliasResult’ in namespace ‘llvm’ does not name a type
   21 |     llvm::AliasResult queryAliasUnderApproximate(llvm::Value &v1, llvm::Value &v2);
      |           ^~~~~~~~~~~
/root/program-dependence-graph/src/DataDependencyGraph.cpp: In member function ‘void pdg::DataDependencyGraph::addAliasEdges(llvm::Instruction&)’:
/root/program-dependence-graph/src/DataDependencyGraph.cpp:44:25: error: ‘queryAliasUnderApproximate’ was not declared in this scope
   44 |     auto alias_result = queryAliasUnderApproximate(inst, *inst_iter);
      |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
/root/program-dependence-graph/src/DataDependencyGraph.cpp:45:25: error: ‘NoAlias’ was not declared in this scope
   45 |     if (alias_result != NoAlias)
      |                         ^~~~~~~
/root/program-dependence-graph/src/DataDependencyGraph.cpp: At global scope:
/root/program-dependence-graph/src/DataDependencyGraph.cpp:95:1: error: ‘AliasResult’ does not name a type
   95 | AliasResult pdg::DataDependencyGraph::queryAliasUnderApproximate(Value &v1, Value &v2)
      | ^~~~~~~~~~~
cc1plus: note: unrecognized command-line option ‘-Wno-everything’ may have been intended to silence earlier diagnostics
make[2]: *** [CMakeFiles/pdg_shared.dir/build.make:108: CMakeFiles/pdg_shared.dir/src/DataDependencyGraph.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:100: CMakeFiles/pdg_shared.dir/all] Error 2
make: *** [Makefile:103: all] Error 2

This issue appears to be a missing include in the file include/DataDependencyGraph.hh and adding the following line appears to fix the issue:

#include "llvm/Analysis/AliasAnalysis.h"

[ARISTODE]

Thanks for the suggestion :) This project is developed based on LLVM version 10.0.0.
12.0.0 have some headers changes and I think that's the reason we have to include the alias header to make it work.