[cfe-commits] Patch to clang -emit-llvm-bc on Linux

[Collin Winter]

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
collinwinter at lagos:/usr/local/google/collinwinter/us/obj$
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