New submission from Daniel Lord:
ERROR SUMMARY:
abstract.h:1332:60: warning: ISO C++ forbids converting a string constant to
‘char*’ [-Wwrite-strings]
#define PyMapping_Keys(O) PyObject_CallMethod(O,"keys",NULL)
ISSUE CRITICALITY:
Non-fatal Warning (will become an error eventually when deprecations expire and
errors are introduced in c++XX or later)
COMPILER:
g++ -std=c++11
g++ 4.2.1
$g++ -v
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr
--with-gxx-include-dir=/usr/include/c++/4.2.1
Apple LLVM version 7.3.0 (clang-703.0.31)
Target: x86_64-apple-darwin15.5.0
Thread model: posix
InstalledDir:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
FILE:
abstract.h
WORKAROUND:
add compiler option: -Wc++11-compat-deprecated-writable-strings and
-Wwritable-strings. In theory anyway: doesn't seem to work (still get the
warning) and when I tried g++ 5.3.0, the compiler marks that option as an error
and unsupported.
g++-5.3.0: error: unrecognized command line option ‘-Wwritable-strings’
g++-5.3.0: error: unrecognized command line option
‘-Wc++11-compat-deprecated-writable-strings’
ERROR MESSAGE:
warning: ISO C++11 does not allow conversion from string literal to 'char *'
[-Wwritable-strings]
pList = PyMapping_Keys(pDict);
^
/Users/xxxxxx/anaconda/include/python2.7/abstract.h:1332:49: note: expanded
from macro 'PyMapping_Keys'
#define PyMapping_Keys(O) PyObject_CallMethod(O,"keys",NULL)
^
1 warning generated.
OFFENDING STATEMNT:
#define PyMapping_Keys(O) PyObject_CallMethod(O,"keys",NULL)
PROBLEM:
"keys" is a string literal but not declared as a constant.
COMMENTS:
This is not a big deal...yet.
I can compile with g++ C++11 using the above flag to allow deprecated writeable
string literals for my application embedding Python 2.7.
However, I assume the embedding code is replete with non-constant string
literals which eventually need to be fixed though this is the first one I have
run into.
----------
components: Extension Modules
messages: 270572
nosy: Daniel Lord
priority: normal
severity: normal
status: open
title: Non-Critical Compiler WARNING: Python Embedding C++11 does not allow
non-constant string literals
type: compile error
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue27530>
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