[LLVMbugs] [Bug 21134] New: CMake build doesn't set LLVM_ENABLE_PLUGINS properly

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=21134

            Bug ID: 21134
           Summary: CMake build doesn't set LLVM_ENABLE_PLUGINS properly
           Product: new-bugs
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: ransford at cs.washington.edu
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13119
  --> http://llvm.org/bugs/attachment.cgi?id=13119&action=edit
CMakeLists.txt

Building {llvm,cfe,compiler-rt}-3.5.0 out of tree with CMake correctly puts the
"AddLLVM" CMake files in $PREFIX/share/llvm/cmake/, but trying to use this
machinery to build an out-of-tree pass with CMake, the
add_llvm_loadable_module() function complains "Loadable modules not supported
on this platform" and generates a Makefile that doesn't build the pass.  Under
{llvm,cfe}-3.4.2 and compiler-rt-3.4 with identical CMake build commands for
LLVM and the pass, CMake produced a correct Makefile.

Both versions of LLVM (+ Clang, + compiler-rt) built with (substitute 3.4.2,
3.5.0 for X.X.X):

  $ cmake -DLLVM_TARGETS_TO_BUILD=X86 -DCMAKE_BUILD_TYPE=Debug
-DCMAKE_INSTALL_PREFIX=/tmp/llvm-X.X.X /tmp/llvm-X.X.X.src

Pass code and CMakeLists.txt attached.  Build with:

  $ mkdir build
  $ cd build
  $ cmake -DLLVM_ROOT=/tmp/llvm-X.X.X ..

It appears that the rules in $PREFIX/share/llvm/cmake/ aren't setting
LLVM_ENABLE_PLUGINS properly when X.X.X == 3.5.0.

Tested on both Linux and OS X (Mavericks) -- same bug.

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