[LLVMdev] -fPIC warning on every compile on Cygwin

Aaron Gray aaronngray.lists at googlemail.com
Fri Feb 27 09:48:28 PST 2009 

On Fri, Feb 27, 2009 at 4:50 PM, Aaron Gray <aaronngray.lists at googlemail.com
> wrote:

>  On Fri, Feb 27, 2009 at 4:32 PM, Jay Foad <jay.foad at gmail.com> wrote:
>
>> >> Could you please rig Makefile.rules or something to print out the value
>> >> of $(LLVM_ON_WIN32) ? The only way I can think of this happening is if
>> >> that's erroneously false.
>>
>> This works for me:
>>
>> Index: Makefile.rules
>> ===================================================================
>> --- Makefile.rules      (revision 65633)
>> +++ Makefile.rules      (working copy)
>> @@ -298,6 +298,8 @@
>>       # Common symbols not allowed in dylib files
>>       CXX.Flags += -fno-common
>>       C.Flags   += -fno-common
>> +    else ifeq ($(OS),Cygwin)
>> +      # Nothing. Cygwin defaults to PIC and warns when given -fPIC
>>     else
>>       # Linux and others; pass -fPIC
>>       CXX.Flags += -fPIC
>
>
> Jay, thanks I will try this.
>

I had to hand modify the code as it did not seem to want to work as a patch.

However, it does not deal with the LLVMHello.dll problem. Here's what I am
getting :-

~~~
llvm[3]: Linking Debug Loadable Module LLVMHello.dll
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZN79_GLO
BAL__N__usr_src_llvm_65633_lib_Transforms_Hello_Hello.cpp_00000000_965F4EBD6Hell
o213runOnFunctionERN4llvm8FunctionE':
/usr/src/llvm-65633/lib/Transforms/Hello/Hello.cpp:53: undefined reference
to `l
lvm::EscapeString(std::basic_string<char, std::char_traits<char>,
std::allocator
<char> >&)'
/usr/src/llvm-65633/lib/Transforms/Hello/Hello.cpp:54: undefined reference
to `l
lvm::cerr'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZN79_GLO
BAL__N__usr_src_llvm_65633_lib_Transforms_Hello_Hello.cpp_00000000_965F4EBD5Hell
o13runOnFunctionERN4llvm8FunctionE':
/usr/src/llvm-65633/lib/Transforms/Hello/Hello.cpp:34: undefined reference
to `l
lvm::EscapeString(std::basic_string<char, std::char_traits<char>,
std::allocator
<char> >&)'
/usr/src/llvm-65633/lib/Transforms/Hello/Hello.cpp:35: undefined reference
to `l
lvm::cerr'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZSt17__v
erify_groupingPKcjRKSs':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2569: undefined reference to
`llvm::PassInfo::registerPass()'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2571: undefined reference to `llvm::Pass::getPassName()
const'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2571: undefined reference to
`llvm::Pass::print(std::basic_ostr
eam<char, std::char_traits<char> >&, llvm::Module const*) const'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2571: undefined reference to
`llvm::FunctionPass::assignPassMan
ager(llvm::PMStack&, llvm::PassManagerType)'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2570: undefined reference to
`llvm::Pass::dumpPassStructure(uns
igned int)'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2576: undefined reference to
`llvm::FunctionPass::runOnModule(l
lvm::Module&)'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZN4llvm1
2RegisterPassIN79_GLOBAL__N__usr_src_llvm_65633_lib_Transforms_Hello_Hello.cpp_0
0000000_965F4EBD5HelloEEC1EPKcS5_bb':
/usr/src/llvm-65633/include/llvm/PassSupport.h:172: undefined reference to
`llvm
::Pass::getPassName() const'
/usr/src/llvm-65633/include/llvm/PassSupport.h:172: undefined reference to
`llvm
::Pass::print(std::basic_ostream<char, std::char_traits<char> >&,
llvm::Module c
onst*) const'
/usr/src/llvm-65633/include/llvm/PassSupport.h:172: undefined reference to
`llvm
::FunctionPass::assignPassManager(llvm::PMStack&, llvm::PassManagerType)'
/usr/src/llvm-65633/include/llvm/PassSupport.h:175: undefined reference to
`llvm
::Pass::dumpPassStructure(unsigned int)'
/usr/src/llvm-65633/include/llvm/PassSupport.h:175: undefined reference to
`llvm
::FunctionPass::runOnModule(llvm::Module&)'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZSt17__v
erify_groupingPKcjRKSs':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2560: undefined reference to
`llvm::Statistic::RegisterStatisti
c()'
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2558: undefined reference to `llvm::Value::getNameStr()
const'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZNSt12_V
ector_baseISt4pairIPKN4llvm8PassInfoEPNS1_4PassEESaIS7_EEC2ERKS8_':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/s
tl_vector.h:(.text$_ZN4llvm12FunctionPassD2Ev[llvm::FunctionPass::~FunctionPass(
)]+0x7): undefined reference to `vtable for llvm::FunctionPass'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZSt17__v
erify_groupingPKcjRKSs':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2558: undefined reference to `llvm::Pass::~Pass()'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZNSt12_V
ector_baseISt4pairIPKN4llvm8PassInfoEPNS1_4PassEESaIS7_EEC2ERKS8_':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/s
tl_vector.h:(.text$_ZN4llvm4PassC2EPKv[llvm::Pass::Pass(void const*)]+0x7):
unde
fined reference to `vtable for llvm::Pass'
/usr/build/llvm-65633/lib/Transforms/Hello/Debug/Hello.o: In function
`_ZSt17__v
erify_groupingPKcjRKSs':
/usr/gcc-4.2.2/lib/gcc/i686-pc-cygwin/4.2.2/../../../../include/c++/4.2.2/bits/l
ocale_facets.tcc:2558: undefined reference to `vtable for
llvm::FunctionPass'
collect2: ld returned 1 exit status
make[3]: *** [/usr/build/llvm-65633/Debug/lib/LLVMHello.dll] Error 1
make[3]: Leaving directory `/usr/build/llvm-65633/lib/Transforms/Hello'
make[2]: *** [Hello/.makeall] Error 2
make[2]: Leaving directory `/usr/build/llvm-65633/lib/Transforms'
make[1]: *** [Transforms/.makeall] Error 2
make[1]: Leaving directory `/usr/build/llvm-65633/lib'
make: *** [all] Error 1

Aaron Gray at AMD2500-PC /usr/build/llvm-65633 $

Aaron
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Index: Makefile.rules
===================================================================
--- Makefile.rules	(revision 65635)
+++ Makefile.rules	(working copy)
@@ -298,6 +298,8 @@
       # Common symbols not allowed in dylib files
       CXX.Flags += -fno-common
       C.Flags   += -fno-common
+    else ifeq ($(OS),Cygwin)
+      # Nothing. Cygwin defaults to PIC and warns when given -fPIC
     else
       # Linux and others; pass -fPIC
       CXX.Flags += -fPIC

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