I'm running current and I need llvm to be built with rtti. This is
disabled upstream but the packaging advice is that it should be made
available with rtti. The standard instructions for this are to set
REQUIRES_RTTI=1 in the build environment. But the packaged version
doesn't correctly build despite this assignment being provided in
MAKE_ENV in the Makefile for the OpenBSD lllvm port.
I still haven't got to the bottom of the question of why the build
compiles some code with -fno-rtti, but I've found the build code that
does this. It's controlled by another environment variable,
LLVM_REQUIRES_RTTI=1, but setting that in the build environment
doesn't seem to help. Something is missing.
Here's a patch to comment out the offending build code and make the
port build clean. It's the best I can do for now. I think this really
needs the attention of somebody who understands cmake.
$OpenBSD$
--- cmake/modules/LLVMProcessSources.cmake.orig Wed May 11 14:53:08 2011
+++ cmake/modules/LLVMProcessSources.cmake Tue Sep 4 22:54:36 2012
@@ -63,13 +63,13 @@ function(llvm_process_sources OUT_VAR)
add_definitions( /D_HAS_EXCEPTIONS=0 )
endif()
endif()
- if( NOT LLVM_REQUIRES_RTTI )
- if( LLVM_COMPILER_IS_GCC_COMPATIBLE )
- llvm_replace_compiler_option(CMAKE_CXX_FLAGS "-frtti" "-fno-rtti")
- elseif( MSVC )
- llvm_replace_compiler_option(CMAKE_CXX_FLAGS "/GR" "/GR-")
- endif()
- endif()
+ #if( NOT LLVM_REQUIRES_RTTI )
+ # if( LLVM_COMPILER_IS_GCC_COMPATIBLE )
+ # llvm_replace_compiler_option(CMAKE_CXX_FLAGS "-frtti" "-fno-rtti")
+ # elseif( MSVC )
+ # llvm_replace_compiler_option(CMAKE_CXX_FLAGS "/GR" "/GR-")
+ # endif()
+ #endif()
set( CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}" PARENT_SCOPE )
set( ${OUT_VAR} ${sources} PARENT_SCOPE )
