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C语言的条件编译if, elif, else, endif.

ifdef and ifndef directives C/C 08/29/2019; 2 minutes to read 1; In this article. The ifdef and ifndef directives have the same effect as the if directive when it's used with the defined operator. Syntax. ifdef identifier ifndef identifier. These directives are equivalent to: if defined identifier if !defined identifier. Remarks. gcc -D defines a macro to be used by the preprocessor. gcc -D option flag. gcc -D defines a macro to be used by the preprocessor. [轉] ifndefdefineendif的用法整理 原作者:icwk 文件中的ifndef 頭件的中的ifndef,這是一個很關鍵的東西。比如你有兩個C文件,這兩個C文件. Created on 2009-07-24 01:17 by ngie, last changed 2010-08-03 21:26 by terry.reedy.This issue is now closed. They delimit blocks of program text that are compiled only if a specified condition is true. These directives can be nested. The program text within the blocks is arbitrary and may consist of preprocessor directives, C statements, and so on. The beginning of the block of program text is marked by one of three directives: if. ifdef. ifndef.

以下の出典より情報収集。 cross platform development 条件コンパイル(インテルコンパイラ icc の判別) _MSC_VERマクロの値 Visual Studio 2017まで – sgryjp.log.old. C의 전처리문이 오는 줄Line의 첫 문자는 항상 ‘’으로 시작한다. ANSI 표준에 따른 C의 전처리문의 종류가 아래에 나와 있다. 파일 처리를 위한 전처리문: include; 형태 정의를 위한 전처리문: define, undef; 조건 처리를 위한 전처리문: if, ifdef, ifndef, else, elif.

linuxカーネルはC言語のマクロを駆使して書かれています。それらのうち、凝ったマクロになじみの無い人には初見では意図がわからない&わかってみれば面白いであろうものをいくつか紹介いたします。. 平时我们在linux c平台开发的时候,引用了一些Cpp或者C的代码库,发现一些头文件有如下代码条件编译。 这个是什么意思呢?一开始看到这个也很茫然。上网查找了一些资料。 主要作用: 为了在C代码. 21.02.2019 · 预处理命令-条件编译 定义ifndef x define x. endif这是宏定义的一种,它可以根据是否已经定义了一个变量来进行分支选择,一般用于调试等等.实际上确切的说这应该是预处理功能中三种(宏定义,文件包含和条件编译)中的一种----条件编译。.

[轉]ifndef, define, endif的用法整理 @ H's 手.

The C preprocessor, often known as cpp, is a macro processor that is used automatically by the C compiler to transform your program before compilation. cpp1 - Linux man page Name. The common predefined macros are GNU C extensions. They are available with the same meanings regardless of the machine or operating system on which you are using GNU C or GNU Fortran. Their names all start with double underscores. __COUNTER__. This macro expands to sequential integral values starting from 0.

C语言中ifdef,ifndef和endif. 本博客记录工作中需要的linux运维命令,大学时候开始接触linux,会一些基本操作,可是都没有整理起来,加上是做开发,不做运维,有些命令忘记了,所以现在整理成博客,当然vi,文件操作等就不介绍了,慢. Conditional inclusions ifdef, ifndef, if, endif, else and elif These directives allow to include or discard part of the code of a program if a certain condition is met. ifdef allows a section of a program to be compiled only if the macro that is specified as the parameter has been defined, no. Anjuta is a solid, simple, intuitive, bug free IDE for C/C development on Linux. Search/Indexing, edit, compile and debug. Anjuta supports Glade Gtk GUI builder, profiling uses gprof and memory leak detection uses valgrind and has an integrated help. 目次 >> C、C >> Tips. ifdefでelse ifは?. 中のFC4はFedora ProjectのFedora Core 4を、FC5はFedora Core 5を、FC6はFedora Core 6をopenSUSEはNovellのSUSE Linux OSSを表します。Fedora7以降は、単にFedora7、Fedora8、Fedora9、Fedora10、Fedora11、Fedora12、Fedora13、Fedora14、Fedora15.

C言語 - プリプロセッサ ifdef - 定義の確認: ifdef コマンドは、define で定義された識別子が あるかどうかをチェックするコマンドです。 あとの処理は、if と同じく、条件付きコンパイル機能となります。 ifdef コマンドの逆の意味である ifndef コマンドも存在します。. This C tutorial explains how to use the define preprocessor directive in the C language. In the C Programming Language, the define directive allows the definition of macros within your source code. シェルにおいて $ FOO= とすると、シェル変数 FOO は空ではあるが、定義はされている。 変数 FOO を未定義にするには $ unset FOO としなければならない。 つまり、シェルスクリプトで、「変数が空」であることと、「変数が未定義」であることは明確. ifdef linux A life immersed in Linux. Saturday, 28 May 2016. Procenv 0.46 - now with more platform godness. I have just released procenv version 0.46.

23.04.2010 · Most Linux systems are POSIX complaint Portable Operating System Inteface for UNIX. They also normally define _POSIX_SOURCE; _POSIX_C_SOURCE >= 200112. When using some of the latest functions from or other header you may want to check the version first. ifdef、ifndef、elif、else、および endif の各ディレクティブ. Informix ESQL/C プリプロセッサでは条件付きコンパイルのための次のディレクティブをサポートしています。 ifdef 名前を検査し、define によりその名前が作成された場合は、後続の文を実行します。 ifndef. ifdef can be used with built-in token identifiers set by the compiler to indicate that additional functionality is available. For instance, the __cplusplus macro is defined in C but not C; you can use this fact to mix C and C code using an ifdef statement: ifdef __cplusplus // C code else // C code endif Related C preprocessor tutorial. c 言語でプログラミングしている際に, ソースファイルが増えるとヘッダファイルの依存関係をいちいち記述するのは面倒である. いろいろな解決方法があるみたいであるが, とりあえずこんなん考えてみた.

Second, if you are only making changes to one.c file, recompiling all of them every time is also time-consuming and inefficient. So, it's time to see what we can do with a makefile. The simplest makefile you could create would look something like: Makefile 1 hellomake: hellomake.c hellofunc.c gcc -o hellomake hellomake.c hellofunc.c -I. NOTE: For more on the compilation process, please refer to the article: Journey of a C program to Linux executable Defining macros with values from command line Not only the macros can be defined from command line as shown in one of the sections above but. C语言条件编译(if,ifdef,ifndef,endif,else,elif) 条件编译(conditional compiling)命令指定预处理器依据特定的条件来判断保留或删除某段源代码。 例如,可以使用条件编译让源代码适用于不同的目标系统,而不需要管理该源代码的各种不同版本。.

If an ifdef is evaluated to be false, then the elseif directive is processed as if it was an ifdef directive. If all elseif directives evaluate to be false, the else directive is processed if it exists. Input is evaluated until an endif directive is encountered. A endif directive ends the ifdef processing. 22.01.2014 · In this c Video tutorial,you will learn the ifdef and ifndef conditional compilation macros. You are gonna learn what are conditional compilation macros and how to use ifdef and ifndef in.

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