Ronald Oussoren <ronaldousso...@mac.com> added the comment:
The bug in the 'gcc' command is still present when using Xcode 4.2.1 (that is,
the attached unicode.c miscompiles with "gcc -O3").
Clang (again from Xcode 4.2.1) compiles the file correctly, but fails to do a
proper build the last few lines of the build log:
clang -bundle -undefined dynamic_lookup
build/temp.macosx-10.4-x86_64-3.3/Users/ronald/Projects/python/rw/cpython/Modules/_cursesmodule.o
-L/usr/local/lib -lncurses -o build/lib.macosx-10.4-x86_64-3.3/_curses.so
/bin/sh: line 1: 84213 Segmentation fault: 11 CC='clang' LDSHARED='clang
-bundle -undefined dynamic_lookup ' OPT='-DNDEBUG -g -fwrapv -O3 -Wall
-Wstrict-prototypes' ./python.exe -E ./setup.py build
make: *** [sharedmods] Error 139
The last bit of a gdb stack trace:
#0 0x00007fff86cd94f0 in strlen ()
#1 0x000000010005bee1 in PyUnicode_FromString (u=0x4c <Address 0x4c out of
bounds>) at unicodeobject.c:1735
#2 0x000000010003bb65 in PyDict_GetItemString (v=0x10075cc58, key=<value
temporarily unavailable, due to optimizations>) at dictobject.c:2187
#3 0x000000010004eaf8 in add_getset [inlined] () at
/Users/ronald/Projects/python/rw/cpython/Objects/typeobject.c:3771
#4 0x000000010004eaf8 in PyType_Ready (type=0x10159efb8) at typeobject.c:4109
#5 0x000000010159209a in PyInit__curses () at
/Users/ronald/Projects/python/rw/cpython/Modules/_cursesmodule.c:3293
#6 0x00000001000c0e20 in _PyImport_LoadDynamicModule (name=0x1010f9f80,
path=0x10074c750, fp=<value temporarily unavailable, due to optimizations>) at
importdl.c:85
#7 0x00000001000beca0 in imp_load_dynamic (self=<value temporarily
unavailable, due to optimizations>, args=<value temporarily unavailable, due to
optimizations>) at import.c:3804
#8 0x000000010009f0c8 in call_function [inlined] () at
/Users/ronald/Projects/python/rw/cpython/Python/ceval.c:4003
For some reason a clean rebuild got a failure in another location, this time in
the Py_XDECREF call on line 2966 in ceval.c:
while (!EMPTY()) {
v = POP();
Py_XDECREF(v);
}
Due to the optimization level I couldn't get more information.
When I patch the Makefile to use '-O2' instead of '-O3' in CFLAGS the problems
stays (obviously with full rebuild).
Patching the optimization level down to '-O1' gives a slightly better result,
this time I get:
./python.exe -SE -m sysconfig --generate-posix-vars
Fatal Python error: Py_Initialize: unable to load the file system codec
SystemError: NULL result without error in PyObject_Call
BTW. I tried to build with srcdir==builddir and "./configure CC=clang" on an
up-to-date OSX 10.7 system with Xcode 4.2.1.
Summary of compiler results:
- gcc-4.2 (i686-apple-darwin11-gcc-4.2.1): unicode.c OK, build OK
- gcc (i686-apple-darwin11-llvm-gcc-4.2): unicode.c fails, build fails
- clang: unicode.c OK, build fails
----------
nosy: +ronaldoussoren
type: -> compile error
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13241>
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