警告：在 C++ 模式下将“c-header”输入视为“c++-header”，此行为已弃用
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Warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated
提问by antimatter
What does this clang++ error message mean, and why am I getting it? I can't seem to find anythingon the internet about it...clang: warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated
这个 clang++ 错误消息是什么意思，为什么我会得到它？我似乎无法在互联网上找到有关它的任何信息...clang: warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated
Here's my code,
这是我的代码，
MergeSort.h:
合并排序.h:
#ifndef __MERGESORT_H__
#define __MERGESORT_H__
#include <iostream>
using namespace std;
class MergeSort;
class MergeSort
{
public:
MergeSort();
MergeSort(const int* list, int length);
~MergeSort();
friend ostream& operator<< (ostream& os, const MergeSort& ms);
private:
int* list;
int len;
};
ostream& operator<< (ostream& os, const MergeSort& ms);
#endif
MergeSort.cpp:
合并排序.cpp:
#include <iostream>
#include "MergeSort.h"
using namespace std;
MergeSort::MergeSort()
{
list = new int[1];
list[0] = 0;
len = 0;
}
MergeSort::MergeSort (const int* t, int length)
{
if (t) {
len = length;
list = new int[len];
for (int i = 0; i < length; i++)
list[i] = t[i];
}
else {
list = new int[1];
list[0] = 0;
len = 0;
}
}
MergeSort::~MergeSort()
{
delete[] list;
}
ostream& operator<<(ostream& os, const MergeSort& ms)
{
for (int i = 0; i < ms.len; i++)
os << ms.list[i];
return os;
}
int
main()
{
int list[] = {1,2,3,4};
int list_len = sizeof(list)/sizeof(int);
MergeSort ms = MergeSort(list, list_len);
cout << ms << endl;
cout << "hello world" << endl;
}
And the output:
和输出：
[gyeh@gyeh mergesort]$ clang++ -c -g -Wall MergeSort.cpp MergeSort.h
clang: warning: treating 'c-header' input as 'c++-header' when in C++ mode, this behavior is deprecated
[gyeh@gyeh mergesort]$ clang++ MergeSort.o -o MergeSort
[gyeh@gyeh mergesort]$ valgrind --leak-check=yes ./MergeSort
==25774== Memcheck, a memory error detector
==25774== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==25774== Using Valgrind-3.9.0 and LibVEX; rerun with -h for copyright info
==25774== Command: ./MergeSort
==25774==
1234
hello world
==25774==
==25774== HEAP SUMMARY:
==25774== in use at exit: 0 bytes in 0 blocks
==25774== total heap usage: 1 allocs, 1 frees, 16 bytes allocated
==25774==
==25774== All heap blocks were freed -- no leaks are possible
==25774==
==25774== For counts of detected and suppressed errors, rerun with: -v
==25774== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 1 from 1)
回答by Some programmer dude
You should not compile the header files, only the source files.
你不应该编译头文件，只编译源文件。
回答by jayatubi
Inspire from @JoachimPileborg. The actually meaning of this error message tells is:
灵感来自@JoachimPileborg。此错误消息的实际含义是：
You're compiling an Cheader file via a CXXcompiler. It DOES NOTmean you CAN NOTcompile the headerfiles. you CANcompile the headerfile if you choose the right compiler for the right files. In simple words:
您正在C通过CXX编译器编译头文件。这DOES NOT意味着您CAN NOT编译头文件。你CAN编译的头文件，如果你选择了正确的文件正确的编译器。简单来说：
clang with *.h works
clang with *.hpp not works
clang++ with *.h not works
clang++ with *.hpp works
So to fix the issue about compiling the header files, for example the pre-compile headers, just change the suffix from .hto .hppwill do the trick.
因此，要解决有关编译头文件的问题，例如预编译头文件，只需将后缀从.hto更改即可.hpp。
