[LLVMdev] configuring LLVM 2.6 for OSX 10.4sdk on OSX 10.5 system

[Graham Wakefield]

Hi all,

(Sorry if the answer to this is obvious - and thanks in advance~)

Short version:
linker error of _backtrace from LLVMSystem.a building a dynamic  
library embedding LLVM/clang, both against the OSX 10.4 sdk.

Long version:
I've just tried rebuilding my project using the 2.6 release, using the  
following commands to try and force LLVM to build against the OSX 10.4  
sdk (I am actually doing this on an OS X 10.5.8 system):

env MACOSX_DEPLOYMENT_TARGET=10.4 ./configure --enable-targets=x86 -- 
enable-jit --enable-optimized --enable-pic
env MACOSX_DEPLOYMENT_TARGET=10.4 make UNIVERSAL_SDK_PATH=/Developer/ 
SDKs/MacOSX10.4u.sdk/

This seems to work fine.

However, my project is a dynamic library in which LLVM/Clang are  
embedded for adding runtime JIT capability to an existing application,  
but in attempting to build, I get a linker error on _backtrace from  
LLVMSystem.a.

Is this a simple mistake on my part, or is LLVM not supported against  
the 10.4 sdk? The problem disappears if I build against 10.5 sdk  
(using llvm-gcc 4.2), but unfortunately that's not possible for the  
application in question. Here's the (abriged) build command:

CompileC build/Objects-normal/i386/gen_codegen.o gen_codegen.cpp  
normal i386 c++ com.apple.compilers.gcc.4_0
     cd llvm
     /Developer/usr/bin/gcc-4.0 -x c++ -arch i386 -fmessage-length=0 - 
pipe -Wno-trigraphs -fpascal-strings -fasm-blocks -O0 -isysroot / 
Developer/SDKs/MacOSX10.4u.sdk -fvisibility-inlines-hidden -mmacosx- 
version-min=10.4 -gdwarf-2 -iquote /build/codegen.build/codegen- 
generated-files.hmap -I/llvm/build/codegen.build/codegen-own-target- 
headers.hmap -I/codegen.build/codegen-all-target-headers.hmap -iquote / 
build/codegen.build/codegen-project-headers.hmap -Wmost -Wno-four-char- 
constants -Wno-unknown-pragmas -F/build/Development -I/Developer/SDKs/ 
MacOSX10.4u.sdk/Developer/Headers/FlatCarbon -I/llvm/llvm-2.6/include - 
I/build/codegen.build/DerivedSources -DLUA_USE_MACOSX -DLUA_USE_DLOPEN  
-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -include /macho- 
prefix.pch -c /llvm/gen_codegen.cpp -o /build/codegen.build/Objects- 
normal/i386/gen_codegen.o

Ld "/sysbuild/Development/codegen.mxo/Contents/MacOS/codegen" normal  
i386
     cd /llvm
     setenv MACOSX_DEPLOYMENT_TARGET 10.4
     /Developer/usr/bin/g++-4.0 -arch i386 -bundle -isysroot / 
Developer/SDKs/MacOSX10.4u.sdk -L/build/Development -L/llvm-2.6/ 
lib_osx -F/build/Development -filelist /build/codegen.build/Objects- 
normal/i386/codegen.LinkFileList -mmacosx-version-min=10.4 - 
lCompilerDriver -lLLVMAnalysis -lLLVMArchive -lLLVMAsmParser - 
lLLVMAsmPrinter -lLLVMBitReader -lLLVMBitWriter -lLLVMCodeGen - 
lLLVMCore -lLLVMDebugger -lLLVMExecutionEngine -lLLVMInstrumentation - 
lLLVMInterpreter -lLLVMipa -lLLVMipo -lLLVMJIT -lLLVMLinker -lLLVMMC - 
lLLVMScalarOpts -lLLVMSelectionDAG -lLLVMSupport -lLLVMSystem - 
lLLVMTarget -lLLVMTransformUtils -lLLVMX86AsmParser - 
lLLVMX86AsmPrinter -lLLVMX86CodeGen -lLLVMX86Info -lLTO -lLTO - 
lplugin_llvmc_Base -lplugin_llvmc_Clang -lprofile_rt -framework  
MaxAudioAPI -framework MaxAPI -framework Carbon -o "/sysbuild/ 
Development/codegen.mxo/Contents/MacOS/codegen"
Undefined symbols:
   "_backtrace", referenced from:
       PrintStackTrace(void*) in libLLVMSystem.a(Signals.o)
ld: symbol(s) not found
collect2: ld returned 1 exit status


On Jan 14, 2009, at 3:43 PM, Graham Wakefield wrote:

> Hi,
>
> For the record, adding
>   UNIVERSAL_SDK_PATH=/Developer/SDKs/MacOSX10.4u.sdk/
> was insufficient to restrict the .a/.o files to link against the  
> 10.4 sdk, but
>   env MACOSX_DEPLOYMENT_TARGET=10.4 make
> did the trick.
>
> Thanks!
>
> On Jan 14, 2009, at 1:29 PM, Jean-Daniel Dupas wrote:
>
>>
>> Le 14 janv. 09 à 21:48, Chris Lattner a écrit :
>>
>>>
>>> On Jan 14, 2009, at 12:44 PM, Graham Wakefield wrote:
>>>
>>>> Sorry if this is a newb q... I'm developing an application on a  
>>>> 10.5 machine but want to target the 10.4 SDK. Is there a magic  
>>>> incantation for the llvm configure script to set the sysroot  
>>>> path, equivalent to e.g. --with-sysroot "/Developer/SDKs/ 
>>>> MacOSX10.4u.sdk"?
>>>>
>>> Try 'make UNIVERSAL_SDK_PATH=/Developer/SDKs/MacOSX10.4u.sdk/'.
>>>
>>> There are some comments in llvm/Makefile.rules that can help,
>>
>> Note that you don't have to use 10.4 SDK to target Tiger. You just  
>> have to set the "macosx version min" (either using the gcc flag - 
>> mmacosx-version-min=10.4 or using the MACOSX_DEPLOYMENT_TARGET env  
>> var)
>>
>> env MACOSX_DEPLOYMENT_TARGET=10.4 make
>>
>>
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