Hi, I am following the instructions on Writing an LLVM Pass on Darwin(8.7.0) powerpc. The loadable library is built. But "opt -load " gives error saying "Symbol not found". I am using LLVM 1.8. Could someone tell me how to fix it? I have tried the same procedure on Pentium4 Redhat9. Everything is ok there. So I think there must be some specific problem on Darwin that I should pay attention to. But what is it? Here is how I got this error. After installing cfrontend3.4 and LLVM, I included cfrontend-bin and LLVM-installed-bin in PATH. I also set LLVM_LIB_SEARCH_PATH to be cfrontend-lib. I copied Hello.cpp and Makefile to ~/tools/build-ppc/lib/Transforms/Hello and built the library. pollux:~/tools/build-ppc/lib/Transforms/Hello $ make llvm[0]: Compiling Hello.cpp for Release build (PIC) llvm[0]: Linking Release Shared Library LLVMHello.so llvm[0]: Linking Release Object Library LLVMHello.o The loadable library was found on ~/tools/build-pcc/Release/lib. pollux:~/tools/build-ppc/Release/lib $ file LLVMHello* LLVMHello.0.0.0.so: Mach-O bundle ppc LLVMHello.0.so: symbolic link to `LLVMHello.0.0.0.so' LLVMHello.a: current ar archive LLVMHello.la: ASCII English text LLVMHello.o: Mach-O object ppc LLVMHello.so: symbolic link to `LLVMHello.0.0.0.so' But when I ran opt -load, it said "symbol not found". pollux:~/test $ opt -load /Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so -help Error opening '/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so': Can't open :/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so: dlopen(/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so, 9): Symbol not found: __ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE Referenced from: /Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so Expected in: flat namespace I guess the problem is that the library who implements the symbol was not found at run time, or the lib path information was not given to LLVMHello correctly at link time. I am new to Darwin. I have tried to set LD_LIBRARY_PATH to be llvm-installed-lib, and rebuilt LLVMHello. No difference was found. What shall I do to fix it? Any information is appreciated. Thanks, Jing -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20060827/48b7d41c/attachment.html>
On Sun, 2006-08-27 at 21:57 -0500, Jing Yu wrote:> Hi, >Hi Jing,> I am following the instructions on Writing an LLVM Pass on > Darwin(8.7.0) powerpc. The loadable library is built. But "opt -load > " gives error saying "Symbol not found". I am using LLVM 1.8. Could > someone tell me how to fix it? I have tried the same procedure on > Pentium4 Redhat9. Everything is ok there. So I think there must be > some specific problem on Darwin that I should pay attention to. But > what is it? > > Here is how I got this error. > > After installing cfrontend3.4 and LLVM, I included cfrontend-bin and > LLVM-installed-bin in PATH. I also set LLVM_LIB_SEARCH_PATH to be > cfrontend-lib. > > I copied Hello.cpp and Makefile to > ~/tools/build-ppc/lib/Transforms/Hello and built the library. > > pollux:~/tools/build-ppc/lib/Transforms/Hello $ make > llvm[0]: Compiling Hello.cpp for Release build (PIC) > llvm[0]: Linking Release Shared Library LLVMHello.so > llvm[0]: Linking Release Object Library LLVMHello.o > > The loadable library was found on ~/tools/build-pcc/Release/lib. > > pollux:~/tools/build-ppc/Release/lib $ file LLVMHello* > LLVMHello.0.0.0.so: Mach-O bundle ppc > LLVMHello.0.so: symbolic link to `LLVMHello.0.0.0.so' > LLVMHello.a: current ar archive > LLVMHello.la: ASCII English text > LLVMHello.o: Mach-O object ppc > LLVMHello.so: symbolic link to `LLVMHello.0.0.0.so' > > But when I ran opt -load, it said "symbol not found". > > pollux:~/test $ opt > -load /Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so -help > Error opening > '/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so': Can't > open :/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so: > dlopen(/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so, 9): > Symbol not found: > __ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE > Referenced > from: /Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so > Expected in: flat namespaceThis corresponds to: FunctionPass::addToPassManager(llvm::FunctionPassManagerT*, llvm::AnalysisUsage&) which should be linked into "opt". It is part of libLLVMCore.a> I guess the problem is that the library who implements the symbol was > not found at run time, or the lib path information was not given to > LLVMHello correctly at link time.I don't know. It works fine on Linux. This could be a darwin linking issue. Please note that we upgraded the ltdl library used to load Darwin shared objects after release 1.8. There were libtool release notes that indicated better support for Darwin so we upgraded to 1.5.22. You may want to apply the same patches to your 1.8 sources and rebuild. That *might* help. The diffs are attached for lib/System/ltdl.h and lib/System/ltdl.c> I am new to Darwin. I have tried to set LD_LIBRARY_PATH to be > llvm-installed-lib, and rebuilt LLVMHello. No difference was found.Yeah, I don't think its so much a problem with building LLVM or LLVMHello. Rather, its the way shared libraries work on Darwin.> What shall I do to fix it? Any information is appreciated.My idea is above. Others (who know Darwin much better) might have other ideas.> > Thanks, > > JingSure. Reid. -------------- next part -------------- A non-text attachment was scrubbed... Name: diffs Type: text/x-patch Size: 19581 bytes Desc: not available URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20060827/33c66d15/attachment.bin>
Thank you, Reid.
I have applied tha patch to ltdl.c ltdl.h. The problem still exists. I
looked up the symbol on libLLVMCore.a, and found three U-entries and one
T-entry. However, the Darwin linker is not able to find the T-entry. Any
idea?
pollux:~/test jingyu$ opt -load
/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so -help
Error opening '/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so':
Can't open :/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so:
dlopen(/Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so, 9): Symbol
not
found:__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
Referenced from: /Users/jingyu/tools/build-ppc/Release/lib/LLVMHello.so
Expected in: flat namespace
pollux:~/tools/build-ppc/Release/lib jingyu$ nm libLLVMCore.a | grep
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
U
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
U
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
00004100 T
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
000197d8 S
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE.eh
U
__ZN4llvm12FunctionPass16addToPassManagerEPNS_20FunctionPassManagerTERNS_13AnalysisUsageE
Jing
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