[LLVMdev] Question about compiling plugins for LLVM tools

[Talin]

On Thu, Jan 27, 2011 at 1:27 AM, Talin <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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