export symbol names with leading underscore

Clang Frontend
#1

Hi

I'm working on the cocotron project. i try to make cocotron "clang"-ready.

I use clang as cross compiler (On OS X for Windows) and bintuils as linker (via gcc).

i got some linking erros like "Cannot export _strnstr: symbol not found"

i analyzed the problem. When you take a look into the object files you see the problem.

Glenn-Ganzs-iMac:bin glenn$ strings "/Users/glenn/Projects/glennganz-cocotron1-
clang/Foundation/build/Windows/i386/Foundation.build/Debug/Foundation-Windows-i386
(clang).build/Objects-normal/i386/CFBase.o" | grep strnstr
strnstr
strnstr
-export:_kCFAllocatorDefault,data -export:_kCFAllocatorSystemDefault,data -
export:_kCFAllocatorMalloc,data -export:_kCFAllocatorMallocZone,data -
export:_kCFAllocatorNull,data -export:_kCFAllocatorUseContext,data -export:_CFAllocatorGetDefault
-export:_CFAllocatorSetDefault -export:_CFAllocatorGetTypeID -export:_CFAllocatorCreate -
export:_CFAllocatorGetContext -export:_CFAllocatorGetPreferredSizeForSize -
export:_CFAllocatorAllocate -export:_CFAllocatorDeallocate -export:_CFAllocatorReallocate -
export:_CFGetTypeID -export:_CFRetain -export:_CFRelease -export:_CFGetRetainCount -
export:_CFGetAllocator -export:_CFHash -export:_CFEqual -export:_CFCopyTypeIDDescription -
export:_CFCopyDescription -export:_CFMakeCollectable -export:_sleep -export:_strlcpy -
export:_strnstr -export:_bzero -export:_bcopy -export:_bcmp -export:_mkstemps -export:_random
_strnstr
Glenn-Ganzs-iMac:bin glenn$ strings "/Users/glenn/Projects/glennganz-cocotron1-
clang/Foundation/build/Windows/i386/Foundation.build/Debug/Foundation-Windows-
i386.build/Objects-normal/i386/CFBase.o" | grep strnstr
strnstr:F(0,77)
-export:kCFAllocatorUseContext,data -export:kCFAllocatorNull,data -
export:kCFAllocatorMallocZone,data -export:kCFAllocatorMalloc,data -
export:kCFAllocatorSystemDefault,data -export:kCFAllocatorDefault,data -export:random -
export:mkstemps -export:bcmp -export:bcopy -export:bzero -export:strnstr -export:strlcpy -
export:sleep -export:CFMakeCollectable -export:CFCopyDescription -
export:CFCopyTypeIDDescription -export:CFEqual -export:CFHash -export:CFGetAllocator -
export:CFGetRetainCount -export:CFRelease -export:CFRetain -export:CFGetTypeID -
export:CFAllocatorReallocate -export:CFAllocatorDeallocate -export:CFAllocatorAllocate -
export:CFAllocatorGetPreferredSizeForSize -export:CFAllocatorGetContext -export:CFAllocatorCreate
-export:CFAllocatorGetTypeID -export:CFAllocatorSetDefault -export:CFAllocatorGetDefault

the object file from gcc has no leading underscore in the export name.

Is there an option for clang to produce the export names without leading underscores?

Thanks
Glenn

#2

No, but there's clearly something going wrong... symbols on darwin are
always prefixed with an underscore, but symbols for Windows aren't.
How exactly are you cross-compiling?

-Eli

#3

Oh, right, symbols are prefixed on Windows. But not here, apparently...

A patch with a testcase, even if it's a hack, would be appreciated.

-Eli

#4

Oh, right, symbols are prefixed on Windows. But not here, apparently...

Probably this is a fallout from MC-ization. I think the best test will
be building something like Qt in shared mode and check what's
happening here.

Please fill the LLVM PR in bugzilla with small testcase.