Question

我编译使用OpenCV的程序时出错，只是包含#include，即：

In file included from /usr/local/include/opencv2/highgui/highgui.hpp:46:
In file included from /usr/local/include/opencv2/core/core.hpp:4826:
/usr/local/include/opencv2/core/mat.hpp:2248:42: error: call to member function 'ptr' is ambiguous
{ return (const _Tp*)((SparseMat*)this)->ptr(i0, false, hashval); }
                     ~~~~~~~~~~~~~~~~~~~~^~~
/usr/local/include/opencv2/core/core.hpp:3507:12: note: candidate function
    uchar* ptr(int i0, bool createMissing, size_t* hashval=0);
           ^
/usr/local/include/opencv2/core/core.hpp:3509:12: note: candidate function
    uchar* ptr(int i0, int i1, bool createMissing, size_t* hashval=0);
           ^
/usr/local/include/opencv2/core/core.hpp:3513:12: note: candidate function not viable: no known conversion from 'int' to
      'const int *' for 1st argument; take the address of the argument with &
    uchar* ptr(const int* idx, bool createMissing, size_t* hashval=0);
           ^
/usr/local/include/opencv2/core/core.hpp:3511:12: note: candidate function not viable: requires at least 4 arguments, but 3 were
      provided
    uchar* ptr(int i0, int i1, int i2, bool createMissing, size_t* hashval=0);

我尝试了多个（最近的）OpenCV版本，但在我的情况下，它们都没有工作。 OpenCV是否正式不支持Clang，或者我应该报告错误？我使用Linux（ubuntu 13.04），我使用clang 3.2-1。

Answer 1

我最近在我的Mac上遇到了同样的错误。（一月至2016）

获取错误的过程如下：

使用brew安装opencv brew install opencv 在这种情况下，brew在opencv之前安装gcc并使用gcc NOT clang编译opencv。 gcc安装在/usr/local/Cellar/gcc/5.3.0/bin/
我制作了我的程序并尝试使用默认选项使用CMake进行编译。 cmake尝试使用clang作为编译器：它的位置是/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc
因为opencv的编译器和程序的编译器不同，所以会产生错误。

所以，我试着在cmake中将编译器设置为gcc set( CMAKE_C_COMPILER /usr/local/Cellar/gcc/5.3.0/bin/gcc-5 ) set( CMAKE_CXX_COMPILER /usr/local/Cellar/gcc/5.3.0/bin/gcc-5 )

然后，我传递了这个错误。

OpenCV Clang mat.hpp错误：调用成员函数'ptr'是不明确的

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