Jun-qi Deng
2012-Mar-14 13:40 UTC
[LLVMdev] llvm-config --cxxflags does not give the result the configuration script wants?
I got your point. Thank you, and I'd like to provide the relative message now. But firstly, what do you mean by the "relevant command generated by your makefile"? What I can tell you now is: The Error Message: make[3]: Entering directory `/home/tang.kk/ppcg/ppcg/isl/interface' CXXLD extract_interface extract_interface.o:(.data.rel.ro._ZTI13MyASTConsumer[typeinfo for MyASTConsumer]+0x10): undefined reference to `typeinfo for clang::ASTConsumer' collect2: ld returned 1 exit status make[3]: *** [extract_interface] Error 1 make[3]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl/interface' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl' make[1]: *** [all] Error 2 make[1]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl' make: *** [all-recursive] Error 1 The "make V=1" is: tang.kk at linux-eda-0:~/ppcg/ppcg> make V=1 Making all in isl make[1]: Entering directory `/home/tang.kk/ppcg/ppcg/isl' make all-recursive make[2]: Entering directory `/home/tang.kk/ppcg/ppcg/isl' Making all in . make[3]: Entering directory `/home/tang.kk/ppcg/ppcg/isl' make[3]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl' Making all in interface make[3]: Entering directory `/home/tang.kk/ppcg/ppcg/isl/interface' /bin/sh ../libtool --tag=CXX --mode=link g++ -I/home/tang.kk/work/llvm-install/include -fPIC -fvisibility-inlines-hidden -D_GNU_SOURCE -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -O2 -save-temps -L/home/tang.kk/work/llvm-install/lib -ldl -lpthread -o extract_interface python.o extract_interface.o -lclangFrontend -lclangSerialization -lclangParse -lclangSema -lclangAnalysis -lclangAST -lclangLex -lclangBasic -lclangDriver -lLLVMAnalysis -lLLVMTarget -lLLVMMC -lLLVMObject -lLLVMCore -lLLVMSupport -L/home/tang.kk/work/llvm-install/lib -ldl -lpthread libtool: link: g++ -I/home/tang.kk/work/llvm-install/include -fPIC -fvisibility-inlines-hidden -D_GNU_SOURCE -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -g -O2 -save-temps -o extract_interface python.o extract_interface.o -L/home/tang.kk/work/llvm-install/lib -lclangFrontend -lclangSerialization -lclangParse -lclangSema -lclangAnalysis -lclangAST -lclangLex -lclangBasic -lclangDriver -lLLVMAnalysis -lLLVMTarget -lLLVMMC -lLLVMObject -lLLVMCore -lLLVMSupport -ldl -lpthread extract_interface.o:(.data.rel.ro._ZTI13MyASTConsumer[typeinfo for MyASTConsumer]+0x10): undefined reference to `typeinfo for clang::ASTConsumer' collect2: ld returned 1 exit status make[3]: *** [extract_interface] Error 1 make[3]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl/interface' make[2]: *** [all-recursive] Error 1 make[2]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl' make[1]: *** [all] Error 2 make[1]: Leaving directory `/home/tang.kk/ppcg/ppcg/isl' make: *** [all-recursive] Error 1 And my llvm-config --cxxflags is: -fPIC -fvisibility-inlines-hidden -D_GNU_SOURCE -Wall -W -Wno-unused-parameter -Wwrite-strings -pedantic -Wno-long-long -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS Best Regards, TangKK> >> Is it? In my experience, it isn't. Please show the relevant command > >> generated by your makefile and the associated error message(s). > >> > > > >> RTTI is an on/off option that changes per LLVM library, so setting > >> -fno-rtti for using LLVM makes no sense. VMCore and Support have -frtti > >> while most of the rest have -fno-rtti. The switch is decided on > >> cmake/modules/LLVMProcessSources.cmake depending on the value of > >> LLVM_REQUIRES_RTTI. > >> > >> > >> Hello! I'm sorry, because I've already solved the build problem with the > > mentioned app manually, now it's not very convenient for me to reproduce > > the error for the moment. I agree that "RTTI is an on/off option". But I > > think the point of the problem I mentioned here is: some applications > that > > depend on llvm and clang use llvm-config to configure their Makefile, > while > > the llvm-config cannot provide the correct information they need. And > this > > is what actually happened under my platform. > > If you read again my post, you'll see that I doubt that the absence of > -fno-rtti on the output of llvm-config is the problem. Using -fno-rtti > is an internal decision taken while building LLVM and it makes no sense > to impose it on third party code. In short: LLVM does not require > -fno-rtti from the projects that link to it. > > Most likely, you were experiencing link problems on *your* code that > were resolved by using -fno-rtti. But as you are not interested on > investigating the issue, we'll never know for sure. >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120314/e6bb93dc/attachment.html>
ofv at wanadoo.es
2012-Mar-14 14:08 UTC
[LLVMdev] llvm-config --cxxflags does not give the result the configuration script wants?
Jun-qi Deng <dengjunqi06323011 at gmail.com> writes:> I got your point. Thank you, and I'd like to provide the relative message > now. But firstly, what do you mean by the "relevant command generated by > your makefile"? What I can tell you now is: > > The Error Message: > make[3]: Entering directory `/home/tang.kk/ppcg/ppcg/isl/interface' > CXXLD extract_interface > extract_interface.o:(.data.rel.ro._ZTI13MyASTConsumer[typeinfo for > MyASTConsumer]+0x10): undefined reference to `typeinfo for > clang::ASTConsumer' > collect2: ld returned 1 exit status[snip] So you define a class MyAstConsumer that derives from clang::ASTConsumer and then the link fails because the typinfo for MyAstConsumer can not reference the typeinfo of clang::ASTConsumer, because the latter is undefined as a consecuence of building Clang with -fno-rtti. In this case the right thing is to apply -fno-rtti to the specific source file that defines MyAstConsumer. Please note that deriving from a Clang/LLVM class is not something that all projects do. The typical compiler that uses LLVM as a backend does not need to derive from LLVM classes at all. Imposing -fno-rtti on those projects most likely would cause breakage on user's code.
Jun-qi Deng
2012-Mar-15 01:21 UTC
[LLVMdev] llvm-config --cxxflags does not give the result the configuration script wants?
2012/3/14 =?utf-8?Q?=C3=93scar_Fuentes?= <ofv at wanadoo.es>> Jun-qi Deng <dengjunqi06323011 at gmail.com> writes: > > > I got your point. Thank you, and I'd like to provide the relative message > > now. But firstly, what do you mean by the "relevant command generated by > > your makefile"? What I can tell you now is: > > > > The Error Message: > > make[3]: Entering directory `/home/tang.kk/ppcg/ppcg/isl/interface' > > CXXLD extract_interface > > extract_interface.o:(.data.rel.ro._ZTI13MyASTConsumer[typeinfo for > > MyASTConsumer]+0x10): undefined reference to `typeinfo for > > clang::ASTConsumer' > > collect2: ld returned 1 exit status > > [snip] > > So you define a class MyAstConsumer that derives from clang::ASTConsumer > and then the link fails because the typinfo for MyAstConsumer can not > reference the typeinfo of clang::ASTConsumer, because the latter is > undefined as a consecuence of building Clang with -fno-rtti. >Oh, I got it! Thank you very much! It helps me a lot.> > In this case the right thing is to apply -fno-rtti to the specific > source file that defines MyAstConsumer. > > Please note that deriving from a Clang/LLVM class is not something that > all projects do. The typical compiler that uses LLVM as a backend does > not need to derive from LLVM classes at all. Imposing -fno-rtti on those > projects most likely would cause breakage on user's code. >Best Regards! TangKK -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20120315/ac712c73/attachment.html>
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