[LLVMdev] Question about compiling plugins for LLVM tools

[Duncan Sands]

Hi Talin, my auto-simplifier uses a plugin (harvest.so) to harvest interesting
code sequences from bitcode.  You might want to take a look at how it is built.
You can get it from svn://topo.math.u-psud.fr/harvest

Ciao, Duncan.

> On Thu, Jan 27, 2011 at 1:27 AM, Talin <viridia at gmail.com
> <mailto:viridia at gmail.com>> wrote:
>
>     When I load my plugin into opt or llc, I get a bunch of warnings:
>
>     llc: CommandLine Error: Argument 'use-unknown-locations' defined more than once!
>     llc: CommandLine Error: Argument 'disable-debug-info-print' defined more
>     than once!
>     llc: CommandLine Error: Argument 'print-dbgscope' defined more than once!
>     llc: CommandLine Error: Argument 'disable-sched-hazard' defined more than once!
>     llc: CommandLine Error: Argument 'verify-dom-info' defined more than once!
>     llc: CommandLine Error: Argument 'time-passes' defined more than once!
>     llc: CommandLine Error: Argument 'print-after-all' defined more than once!
>     llc: CommandLine Error: Argument 'print-before-all' defined more than once!
>     llc: CommandLine Error: Argument 'print-after' defined more than once!
>     llc: CommandLine Error: Argument 'print-before' defined more than once!
>     llc: CommandLine Error: Argument 'debug-pass' defined more than once!
>     llc: CommandLine Error: Argument 'version' defined more than once!
>     llc: CommandLine Error: Argument 'help-hidden' defined more than once!
>     llc: CommandLine Error: Argument 'help' defined more than once!
>     llc: CommandLine Error: Argument 'debug-only' defined more than once!
>     llc: CommandLine Error: Argument 'debug-buffer-size' defined more than once!
>     llc: CommandLine Error: Argument 'debug' defined more than once!
>     llc: CommandLine Error: Argument 'stats' defined more than once!
>     llc: CommandLine Error: Argument 'info-output-file' defined more than once!
>     llc: CommandLine Error: Argument 'track-memory' defined more than once!
>
>     I'm guessing the reason this happens is because the plugin is a shared
>     library that is linking against the LLVM libraries, and so what happens is
>     that the various command-line objects, which are statically constructed, are
>     getting loaded twice, once for the tool itself, and once for the plugin.
>
>     However, I'm not sure how to create my plugin any differently. I'm using
>     cmake's 'add_library(name SHARED ...)' to create the plugin like so:
>
>         add_library(reflector SHARED ${REFLECT_SOURCES} ${COMMON_HEADERS}
>         ${REFLECT_HEADERS})
>         target_link_libraries(reflector
>              linker_common
>              ${LLVM_TARGET}
>              ${LLVM_CORE}
>              ${LLVM_SUPPORT}
>              ${LLVM_SYSTEM}
>              )
>
>
>     Any advice on this?
>
>
> Still trying to puzzle this one out...what I think I need is to link my plugin
> such that it doesn't include the LLVM libs in the plugin, but only refer to them
> as external symbols - but I'm not enough of a unix expert to know how to do that.
>
> -- Talin
>
>
>
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