[llvm-dev] custom LLVM Pass with options fails to load

[Philip Pfaffe via llvm-dev]

Hi Viktor,

I believe you shouldn't set LLVM_LINK_COMPONENTS.

You don't need to link your TestPass against anything since opt is expected
to have everything loaded already. If you're linking against a statically
built LLVM, then this way you'll pull in other definitions of cl::opt'ions,
which'll then clash with the ones that are in opt.

Cheers,
Philip

On Tue, Jul 10, 2018 at 3:26 PM Viktor Was via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hi,
> I'm working on an LLVM Pass plugin and I'm running into a problem when
> loading it into opt.
> I want to have a custom option for my pass and added an llvm::cl::opt
> #include'ing "llvm/Support/CommandLine.h"
>
> linking the dependant libs causes the following error when loading it
> with opt:
> opt: CommandLine Error: Option 'debug-pass' registered more than once!
>
> I narrowed it down to the Core lib but without it I get this
>
> opt:
> /home/qwert/projects/ext/repos/llvm/6.0.0/lib/Support/CommandLine.cpp:281:
>
> void (anonymous
> namespace)::CommandLineParser::registerCategory(llvm::cl::OptionCategory
> *):
> Assertion `count_if(RegisteredOptionCategories, [cat](const
> OptionCategory *Category) { return cat->getName() ==
> Category->getName(); }) == 0 && "Duplicate option categories"' failed.
> LLVMSymbolizer: error reading file: No such file or directory
> #0 0x0000000001d8eea4 (opt+0x1d8eea4)
> #1 0x0000000001d8f206 (opt+0x1d8f206)
> #2 0x00007fb283220390 __restore_rt
> (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
> #3 0x00007fb2821cd428 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x35428)
> #4 0x00007fb2821cf02a abort (/lib/x86_64-linux-gnu/libc.so.6+0x3702a)
> #5 0x00007fb2821c5bd7 (/lib/x86_64-linux-gnu/libc.so.6+0x2dbd7)
> #6 0x00007fb2821c5c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
> #7 0x0000000001d2b2a9 (opt+0x1d2b2a9)
> #8 0x00007fb281efebc2 _GLOBAL__sub_I_CommandLine.cpp
>
> (/home/qwert/projects/ext/projects/cmake/llvm/6.0.0/lib/TestPass.so+0x28bc2)
> #9 0x00007fb28343c6ba (/lib64/ld-linux-x86-64.so.2+0x106ba)
> #10 0x00007fb28343c7cb (/lib64/ld-linux-x86-64.so.2+0x107cb)
> #11 0x00007fb2834418e2 (/lib64/ld-linux-x86-64.so.2+0x158e2)
> #12 0x00007fb28343c564 (/lib64/ld-linux-x86-64.so.2+0x10564)
> #13 0x00007fb283440da9 (/lib64/ld-linux-x86-64.so.2+0x14da9)
> #14 0x00007fb282e03f09 __asprintf (/lib/x86_64-linux-gnu/libdl.so.2+0xf09)
> #15 0x00007fb28343c564 (/lib64/ld-linux-x86-64.so.2+0x10564)
> #16 0x00007fb282e04571 (/lib/x86_64-linux-gnu/libdl.so.2+0x1571)
> #17 0x00007fb282e03fa1 dlopen (/lib/x86_64-linux-gnu/libdl.so.2+0xfa1)
> #18 0x0000000001d7b88b (opt+0x1d7b88b)
> #19 0x0000000001d44de9 (opt+0x1d44de9)
> #20 0x000000000069f0b4 (opt+0x69f0b4)
> #21 0x0000000001d35a91 (opt+0x1d35a91)
> #22 0x0000000001d2e3b9 (opt+0x1d2e3b9)
> #23 0x00000000006958b4 (opt+0x6958b4)
> #24 0x00007fb2821b8830 __libc_start_main
> (/lib/x86_64-linux-gnu/libc.so.6+0x20830)
> #25 0x0000000000686be9 (opt+0x686be9)
> Stack dump:
> 0.      Program arguments: opt -load
> /home/maliusarth/projects/ext/projects/cmake/llvm/6.0.0/lib/TestPass.so
> -testPass test.cpp
> Aborted
>
>
> in my cmakelists.txt I have the following:
>
> set(CMAKE_BUILD_TYPE Debug)
>
> set(LLVM_LINK_COMPONENTS
>         Core # narrowed it down to this
>         BinaryFormat
>         Support
>         Demangle
> )
>
> add_llvm_loadable_module( TestPass
>         TestPass.cpp
>
>         DEPENDS
>         intrinsics_gen
>         PLUGIN_TOOL
>         opt
> )
>
> in my cpp I have this:
>
> #include "llvm/IR/Constants.h"
> #include "llvm/IR/Function.h"
> #include "llvm/IR/Module.h"
> #include "llvm/IR/PassManager.h"
> #include "llvm/Support/raw_ostream.h"
> #include "llvm/Support/CommandLine.h"
>
> #include <string>
>
> namespace
> {
> // Apply a custom category to all command-line options so that they are the
> // only ones displayed.
> static llvm::cl::OptionCategory testCategory("testPass Options");
>
> static llvm::cl::opt<std::string>
>         testOpt("testOpt", llvm::cl::desc("testOpt"),
>                    llvm::cl::value_desc("test pass opt"),
> llvm::cl::cat(testCategory));
> }
>
> namespace test
> {
> char TestPass::ID = 0;
>
> static ::llvm::RegisterPass<test::TestPass>
>         X("testPass", "test pass", false /* Only looks at CFG */,
>           false /* Analysis Pass */);
> }
>
> the rest of the file is more or less straight out of the Hello example.
>
> I'm working with this llvm version
> http://llvm.org/svn/llvm-project/llvm/tags/RELEASE_600/final
>
> I'd appreciate any help on this issue.
>
> Viktor
>
> _______________________________________________
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> llvm-dev at lists.llvm.org
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>
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