On Apr 29, 2009, at 7:24 PM, Daniel Dunbar wrote:
Hi Colin,
I would definitely like to improve this, but I also think that the
llvm-gcc behavior (which clang is just copying) was chosen by
design. Poor design, perhaps, but I believe the intent was that -
emit-llvm simply changes the output format, not the functionality.
Thus -S -emit-llvm is output in LLVM IR, -c -emit-llvm is output in
LLVM bitcode, -emit-llvm alone is an executable, but having been
compiled with LLVM tools. The problem, of course, is when the linker
doesn't have LLVM support.
I'd rather not break "compatibility" with llvm-gcc... is there a
specific reason you wante to change this (why not use "-c"?). If it
just comes down to eliminating the current bad user experience, we
could augment the tool chain to understand whether the system
supports LLVM inputs and avoid trying to pass them to the linker and
give an error instead.
Note that llvm IR inputs are supported on both the mac and linux,
given appropriate tools (a 10.5 linker, and the gold linker with llvm
plugin, respectively).
-Chris
- Daniel
On Wed, Apr 29, 2009 at 3:54 PM, Collin Winter <[email protected]
> wrote:
Hi all,
Currently on Linux, clang -emit-llvm and -emit-llvm-bc will attempt to
run the generated LLVM file through gcc, resulting in errors like
those below. The attached patch tells clang to stop at compilation for
-emit-llvm and -emit-llvm-bc, rather than attempting to pass them to
ld. The patch also includes tests for this behavior.
The patch is against r70419. I've tested this on Darwin and Linux with
clang's make test.
Thanks,
Collin Winter
$ ../../llvm/Debug/bin/clang -ccc-echo -O3 -emit-llvm-bc -I.
-IInclude -I../trunk -I../trunk/Include -DPy_BUILD_CORE
../trunk/Python/llvm_inline_functions.c -o
Python/llvm_inline_functions.bc
"/usr/local/google/collinwinter/llvm/Debug/bin/clang-cc" -triple
i386-unknown-linux-gnu -S -disable-free -main-file-name
llvm_inline_functions.c --relocation-model static --disable-fp-elim
--unwind-tables=0 --fmath-errno=1 -DPy_BUILD_CORE -I. -IInclude
-I../trunk -I../trunk/Include -O3 -fdiagnostics-show-option -o
/tmp/cc-4HJUGl.s -x c ../trunk/Python/llvm_inline_functions.c
"/usr/bin/gcc" -O3 -emit-llvm-bc -I. -IInclude -I../trunk
-I../trunk/Include -DPy_BUILD_CORE -c -o /tmp/cc-fL4PGn.o -x assembler
/tmp/cc-4HJUGl.s
"/usr/bin/gcc" -O3 -emit-llvm-bc -I. -IInclude -I../trunk
-I../trunk/Include -DPy_BUILD_CORE -o Python/llvm_inline_functions.bc
/tmp/cc-fL4PGn.o
/usr/bin/ld: warning: cannot find entry symbol mit-llvm-bc; defaulting
to 0000000008048f50
/usr/lib/gcc/i486-linux-gnu/4.0.3/../../../../lib/crt1.o: In
function `_start':
/tmp/glibc.iZwOIW/glibc-2.3.6-0ubuntu20/build-tree/glibc-2.3.6/
csu/../sysdeps/i386/elf/start.S:115:
undefined reference to `main'
/tmp/cc-fL4PGn.o: In function `_PyLlvm_WrapDealloc':
../trunk/Python/llvm_inline_functions.c:(.text+0x9ed): undefined
reference to `_Py_Dealloc'
/tmp/cc-fL4PGn.o: In function `_PyLlvm_WrapIsExceptionOrString':
../trunk/Python/llvm_inline_functions.c:(.text+0xa0a): undefined
reference to `PyClass_Type'
/tmp/cc-fL4PGn.o: In function `_PyLlvm_WrapEnterExceptOrFinally':
../trunk/Python/llvm_inline_functions.c:(.text+0xa3a): undefined
reference to `PyThreadState_Get'
../trunk/Python/llvm_inline_functions.c:(.text+0xa56): undefined
reference to `PyErr_Fetch'
../trunk/Python/llvm_inline_functions.c:(.text+0xa65): undefined
reference to `_Py_NoneStruct'
../trunk/Python/llvm_inline_functions.c:(.text+0xa6b): undefined
reference to `_Py_RefTotal'
../trunk/Python/llvm_inline_functions.c:(.text+0xa85): undefined
reference to `PyErr_NormalizeException'
../trunk/Python/llvm_inline_functions.c:(.text+0xaa4): undefined
reference to `_PyEval_SetExcInfo'
../trunk/Python/llvm_inline_functions.c:(.text+0xaaf): undefined
reference to `_Py_RefTotal'
../trunk/Python/llvm_inline_functions.c:(.text+0xab5): undefined
reference to `_Py_NoneStruct'
../trunk/Python/llvm_inline_functions.c:(.text+0xabb): undefined
reference to `_Py_NoneStruct'
../trunk/Python/llvm_inline_functions.c:(.text+0xac0): undefined
reference to `PyErr_Clear'
collect2: ld returned 1 exit status
$
$ ../../llvm/Debug/bin/clang -ccc-echo -O3 -emit-llvm -I. -IInclude
-I../trunk -I../trunk/Include -DPy_BUILD_CORE
../trunk/Python/llvm_inline_functions.c -o
Python/llvm_inline_functions.ir
"/usr/local/google/collinwinter/llvm/Debug/bin/clang-cc" -triple
i386-unknown-linux-gnu -emit-llvm-bc -disable-free -main-file-name
llvm_inline_functions.c --relocation-model static --disable-fp-elim
--unwind-tables=0 --fmath-errno=1 -DPy_BUILD_CORE -I. -IInclude
-I../trunk -I../trunk/Include -O3 -fdiagnostics-show-option -o
/tmp/cc-zFrEU8.o -x c ../trunk/Python/llvm_inline_functions.c
"/usr/bin/gcc" -O3 -emit-llvm -I. -IInclude -I../trunk
-I../trunk/Include -DPy_BUILD_CORE -o Python/llvm_inline_functions.ir
/tmp/cc-zFrEU8.o
/tmp/cc-zFrEU8.o: file not recognized: File format not recognized
collect2: ld returned 1 exit status
collinwin...@lagos:/usr/local/google/collinwinter/us/obj$
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