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2 Building from Source use none none integrating toproduce none with nonecode 39 generator .net which can be misleading. none for none Here s an example of how the initializers can fool you into creating a bug:. iOS 1 2 3 4 5 6 7 8 9 10 11 1 2 13 14 15 16 struct Foo { int m_two; int m_one; Foo( int one ) : m_one(one), m_two(m_one+1) {}; }; #include <iostream> int main(int argc, char **argv[]) { Foo f(1); std::cout << f.m_one << std::endl; std::cout << f.m_two << std::endl; } // declaration.

// initializer $ gcc -c -Wall order.cpp order.cpp: In constructor "Foo::Foo(int)": order.

cpp:3: warning: "Foo::m_one" will be initialized after order.cpp:2: warning: "int Foo::m_two" order.cpp:6: warning: when initialized here.

The initializers appear o none for none n lines 5 and 6 above. If you look at only the two initializers, you may see nothing wrong. Look again, and you realize that m_two was defined first and therefore is initialized first.

This is a problem, because m_two is initialized using the value of m_one, which is uninitialized when m_two is initialized. To solve the problem, you must reorder the declarations so that m_two is declared after m_one. Deprecated features Emit warnings for modules that use deprecated features such as using old-style Standard Template Library (STL) headers (for example, iostream.

h instead of <iostream>). The warning you will see looks like the following:. warning: #warning This fi le includes at least one deprecated or antiquated header. Please consider using one of the 32 headers found in section 17.4.

1.2 of the C++ standard. Examples include substituting the <X> header for the <X.

h> header for C++ includes, or <iostream> instead of the deprecated header <iostream.h>. To disable this warning use -Wnodeprecated.

. Understanding Errors and Warnings This warning pops up even when you compile without warnings enabled. If you follow the suggestion, you will change the #include statements to use the new-style headers but not so fast. Along with the new headers comes much stricter namespace enforcement.

In particular, any references to symbols in namespace std will not compile unless you add the appropriate namespace qualifier or a using statement. You are likely to see this only in legacy code that predates the C++ standard or in code you may be porting from a system with a more permissive C++ compiler. You have three choices here: 1.

Easiest Ignore it and/or turn it off using -Wno-deprecated. 2. Easy Fix the offending headers and add the statement using namespace std to the module body (but not in any header files).

13 3. More work Fix the offending headers and use appropriate namespace qualifiers. Incompatible ABI This warning is not part of -Wall but is turned on with the -Wabi flag.

ABI stands for Application Binary Interface, and it is the convention used for calling functions that allows multiple programming languages to live in the same program. You may be writing a C++ program that calls a library written in Fortran, and even though you don t have a Fortran compiler, your program works. This is possible because the Fortran compiler follows a particular ABI.

The ABI tells the compiler how to call a function and how to pass arguments. The ABI is unique for each combination of processor and operating system, because each has unique requirements and capabilities. Most procedural languages have no issues conforming to a common ABI, so ABIs typically are language neutral.

C++, however, is sufficiently complicated that it requires the ABI to be extended in ways that are unique to the C++ language. The lack of a standard ABI requires each compiler to make arbitrary extensions to the C ABI to support C++. As a result, for example, you may not be able to link code created by GNU C++ with a library compiled by a commercial vendor because.

13. Never put using names none none pace std in a header file. This pollutes the namespace of any module that uses it and can cause difficult-to-find bugs.

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