重载“malloc(int)”的调用不明确
[英]call of overloaded ‘malloc(int)’ is ambiguous
问题描述
The following function belongs to the CoinUtils project, that is used in the open-source CBC linear programming solver.
以下function属于CoinUtils项目，用于开源CBC线性规划求解器。
/** Returns strdup or NULL if original NULL */
inline char *CoinStrdup(const char *name)
{
char *dup = NULL;
if (name) {
const int len = static_cast< int >(strlen(name));
dup = static_cast< char * >(malloc(len + 1));
CoinMemcpyN(name, len, dup);
dup[len] = 0;
}
return dup;
}
I'm getting the following error when I compile in debug mode in GCC 11 under ubuntu 22.04.当我在 GCC 11 under ubuntu 22.04 中以调试模式编译时出现以下错误。
error: call of overloaded ‘malloc(int)’ is ambiguous
624 | dup = static_cast< char * >(malloc(len + 1));
Can someone explain what's going on?有人可以解释发生了什么吗？
The complete error message is this:完整的错误信息是这样的：
In file included from /src/third_party/coin-or/Clp/src/ClpModel.hpp:21,
from /src/third_party/coin-or/Clp/src/ClpSimplex.hpp:16,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:12,
from /src/test/lp_tests.h:13,
from /src/test/lp_tests.cpp:5:
/src/third_party/coin-or/CoinUtils/src/CoinHelperFunctions.hpp: In function ‘char* CoinStrdup(const char*)’:
/src/third_party/coin-or/CoinUtils/src/CoinHelperFunctions.hpp:624:39: error: call of overloaded ‘malloc(int)’ is ambiguous
624 | dup = static_cast< char * >(malloc(len + 1));
| ~~~~~~^~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/testing_utilities.h:8,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/usr/include/stdlib.h:540:14: note: candidate: ‘void* malloc(size_t)’
540 | extern void *malloc (size_t __size) __THROW __attribute_malloc__
| ^~~~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/test/testing_utilities.h:9,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:332:3: note: candidate: ‘void* arma::superlu::malloc(std::size_t)’
332 | malloc(size_t N)
| ^~~~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/lp_tests.cpp:5:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp: In destructor ‘CoinYacc::~CoinYacc()’:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:200:11: error: call of overloaded ‘free(char*&)’ is ambiguous
200 | free(symbuf);
| ~~~~^~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/testing_utilities.h:8,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/test/testing_utilities.h:9,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/lp_tests.cpp:5:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:205:11: error: call of overloaded ‘free(char*&)’ is ambiguous
205 | free(s->name);
| ~~~~^~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/testing_utilities.h:8,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/test/testing_utilities.h:9,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/lp_tests.cpp:5:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:208:11: error: call of overloaded ‘free(symrec*&)’ is ambiguous
208 | free(symtable);
| ~~~~^~~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/testing_utilities.h:8,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/test/testing_utilities.h:9,
from /src/test/lp_tests.h:8,
from /src/test/lp_tests.cpp:5:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
gmake[3]: *** [CMakeFiles/Tests.dir/build.make:8532: CMakeFiles/Tests.dir/src/test/lp_tests.cpp.o] Error 1
gmake[3]: *** Se espera a que terminen otras tareas....
In file included from /src/third_party/coin-or/Clp/src/ClpModel.hpp:21,
from /src/third_party/coin-or/Clp/src/ClpSimplex.hpp:16,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:12,
from /src/test/lp_tests.h:13,
from /src/test/tests.cpp:20:
/src/third_party/coin-or/CoinUtils/src/CoinHelperFunctions.hpp: In function ‘char* CoinStrdup(const char*)’:
/src/third_party/coin-or/CoinUtils/src/CoinHelperFunctions.hpp:624:39: error: call of overloaded ‘malloc(int)’ is ambiguous
624 | dup = static_cast< char * >(malloc(len + 1));
| ~~~~~~^~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/tests.cpp:2:
/usr/include/stdlib.h:540:14: note: candidate: ‘void* malloc(size_t)’
540 | extern void *malloc (size_t __size) __THROW __attribute_malloc__
| ^~~~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/core/arma_extend/arma_extend.hpp:21,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/base.hpp:87,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack.hpp:25,
from /src/engine/../utils/type_declarations.h:9,
from /src/engine/../utils/armadillo_extension.h:19,
from /src/test/../engine/core/data_structures/bus_data.h:10,
from /src/test/../engine/core/data_structures/numeric_circuit.h:22,
from /src/test/../newton.h:9,
from /src/test/tests.cpp:9:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:332:3: note: candidate: ‘void* arma::superlu::malloc(std::size_t)’
332 | malloc(size_t N)
| ^~~~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/tests.cpp:20:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp: In destructor ‘CoinYacc::~CoinYacc()’:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:200:11: error: call of overloaded ‘free(char*&)’ is ambiguous
200 | free(symbuf);
| ~~~~^~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/tests.cpp:2:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/core/arma_extend/arma_extend.hpp:21,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/base.hpp:87,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack.hpp:25,
from /src/engine/../utils/type_declarations.h:9,
from /src/engine/../utils/armadillo_extension.h:19,
from /src/test/../engine/core/data_structures/bus_data.h:10,
from /src/test/../engine/core/data_structures/numeric_circuit.h:22,
from /src/test/../newton.h:9,
from /src/test/tests.cpp:9:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/tests.cpp:20:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:205:11: error: call of overloaded ‘free(char*&)’ is ambiguous
205 | free(s->name);
| ~~~~^~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/tests.cpp:2:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/core/arma_extend/arma_extend.hpp:21,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/base.hpp:87,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack.hpp:25,
from /src/engine/../utils/type_declarations.h:9,
from /src/engine/../utils/armadillo_extension.h:19,
from /src/test/../engine/core/data_structures/bus_data.h:10,
from /src/test/../engine/core/data_structures/numeric_circuit.h:22,
from /src/test/../newton.h:9,
from /src/test/tests.cpp:9:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
In file included from /src/third_party/coin-or/CoinUtils/src/CoinModel.hpp:8,
from /src/engine/core/../core/lp_interface/lp_osi_interface.h:16,
from /src/test/lp_tests.h:13,
from /src/test/tests.cpp:20:
/src/third_party/coin-or/CoinUtils/src/CoinModelUseful.hpp:208:11: error: call of overloaded ‘free(symrec*&)’ is ambiguous
208 | free(symtable);
| ~~~~^~~~~~~~~~
In file included from /usr/include/c++/11/cstdlib:75,
from /usr/include/c++/11/ext/string_conversions.h:41,
from /usr/include/c++/11/bits/basic_string.h:6608,
from /usr/include/c++/11/string:55,
from /usr/include/c++/11/bits/locale_classes.h:40,
from /usr/include/c++/11/bits/ios_base.h:41,
from /usr/include/c++/11/ios:42,
from /usr/include/c++/11/ostream:38,
from /usr/include/c++/11/iostream:39,
from /src/test/tests.cpp:2:
/usr/include/stdlib.h:555:13: note: candidate: ‘void free(void*)’
555 | extern void free (void *__ptr) __THROW;
| ^~~~
In file included from /src/third_party/header_only/armadillo-11.1.0/include/armadillo:134,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/core/arma_extend/arma_extend.hpp:21,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack/base.hpp:87,
from /src/third_party/header_only/mlpack-4.0.0/src/mlpack.hpp:25,
from /src/engine/../utils/type_declarations.h:9,
from /src/engine/../utils/armadillo_extension.h:19,
from /src/test/../engine/core/data_structures/bus_data.h:10,
from /src/test/../engine/core/data_structures/numeric_circuit.h:22,
from /src/test/../newton.h:9,
from /src/test/tests.cpp:9:
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:341:3: note: candidate: ‘void arma::superlu::free(void*)’
341 | free(void* mem)
| ^~~~
gmake[3]: *** [CMakeFiles/Tests.dir/build.make:8462: CMakeFiles/Tests.dir/src/test/tests.cpp.o] Error 1
gmake[2]: *** [CMakeFiles/Makefile2:324: CMakeFiles/Tests.dir/all] Error 2
gmake[1]: *** [CMakeFiles/Makefile2:331: CMakeFiles/Tests.dir/rule] Error 2
gmake: *** [Makefile:293: Tests] Error 2
3 个解决方案
解决方案1
5 已采纳 2023-01-04 21:16:09
The two functions it's considering are the standard void* malloc(size_t) and void* arma::superlu::malloc(std::size_t) .它正在考虑的两个函数是标准的void* malloc(size_t)和void* arma::superlu::malloc(std::size_t) 。 Presumably somewhere you have using namespace arma::superlu which pulls everything from that namespace into the global namespace.大概在某个地方您using namespace arma::superlu ，它将所有内容从该命名空间拉入全局命名空间。
To get around it, you can要绕过它，你可以
- get rid of
using namespace arma::superluand either fully qualify everything from that namespace or pull in exactly you need (withusing arma::superlu::xyz;).摆脱using namespace arma::superlu并完全限定该命名空间中的所有内容或完全符合您的需要（using arma::superlu::xyz;）。 Or要么 - Qualify the
malloccall with::malloc, or preferablystd::mallocto call the C++ standard version.使用::malloc限定malloc调用，或者最好使用std::malloc来调用 C++ 标准版本。
Similar for the ambiguous calls to free .类似于对free的模糊调用。
解决方案2
1 2023-01-04 21:16:22
The error messages explain: the call to malloc is ambiguous due to two candidates:错误消息解释：由于两个候选人，对malloc的调用不明确：
std::malloc
arma::superlu::malloc
To avoid this you should explicitly call the intended one, eg std::malloc , rather than relying on overload resolution.为避免这种情况，您应该显式调用预期的调用，例如std::malloc ，而不是依赖重载解析。 You might also want to look at why arma::superlu:: is being searched.您可能还想看看为什么要搜索arma::superlu:: 。 Is there a using directive;是否有使用指令； or is this code perhaps defined inside that namespace and so that was the intended version of malloc to call.或者此代码是否可能在该命名空间内定义，因此这是要调用的 malloc 的预期版本。
NB.注意。 The code has a vulnerability in the behaviour when the input string is longer than INT_MAX , and it would also be good to check what is going to happen if malloc returns a null pointer.当输入字符串长于INT_MAX时，代码在行为上存在漏洞，如果malloc返回 null 指针，检查将发生什么也是很好的。
解决方案3
0 2023-01-26 21:47:23
std::malloc is not a candidate here: std::malloc不是这里的候选人：
/usr/include/stdlib.h:540:14: note: candidate: ‘void* malloc(size_t)’
540 | extern void *malloc (size_t __size) __THROW __attribute_malloc__
| ^~~~~~
...
/src/third_party/header_only/armadillo-11.1.0/include/armadillo_bits/translate_superlu.hpp:332:3: note: candidate: ‘void* arma::superlu::malloc(std::size_t)’
332 | malloc(size_t N)
| ^~~~~~
But the culprit likely is a using namespace arma::superlu somewhere in your own code, or in one of the thirdparty headers.但罪魁祸首可能是在您自己的代码或第三方标头之一中的某个地方using namespace arma::superlu 。
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