gnu make or conditional

 

 

 

 

A number of architectures provide for some form of conditional execution, or predication.When definecondexec is used, an implicit reference to the predicable instruction attribute is made. See Insn Attributes. GNU Make provides a rich set of conditional directives, with which you can annotate parts of the Makefile to be used conditionally (or ignored). Make conditional directives work in very much the same way as C preprocessor directives (of the GCC chapter (FIXME I usually take advantage of conditional functions: SPECIFICFLAGS(if (findstring (CUSTOMFLAG),TRUE),(IFTRUE),(IFFALSE)).More: What is a make target? I set MYVAR when calling make: MYVARabc make. I would have expected to see "Value is known." but I get the following GNU Make conditionals are checked at make time, and are based on variables passed to the make program or defined in the Makefile. Automake conditionals will work with any make program. 21/12/2017 GNU make: Conditional Syntax. Next: Testing may safely be split across the beginning or the end of the conditional. make evaluates conditionals when itId like to enable a verbose compilation in my makefile, but I cant figure out how to make a conditional OR. If you have problems with GNU make or think youve found a bug, please report it to the developers we cannot promise to do anything but we might well want to fix it.The following example of a conditional tells make to use one set of libraries if the CC variable is gcc, and a different set of libraries otherwise. GNU Make provides a rich set of conditional directives, with which you can annotate parts of the Makefile to be used conditionally (or ignored). Make conditional directives work in very much the same way as C preprocessor directives (of the GCC chapter (FIXME If ok is not blank, the required version of GNU make or later is being used if its blank, the version is too old.else Another feature introduced in GNU make 3.

81 was support for non-nested else branches by having the conditional on the same line as the else. If you have problems with GNU make or think youve found a bug, please report it to the developers we cannot promise to do anything but we might well want to fix it.The following example of a conditional tells make to use one set of libraries if the CC variable is gcc, and a different set of libraries otherwise. Using GNU make, maybe this is what you need?or you can rewrite your makefile to use conditional operators, and then use (or). See info make "Conditional Syntax" and info make "Conditional Functions". But then why did it print false? Because before make parses the results of the evaluation, it first expands the string to be evaluated. The info function is being expanded when the argument to eval is being expanded, before make parses the code. One version might make frequent time-consuming consistency checks on its intermediate data, or print the values of those data for debugging, and the other not. A conditional whose condition is always false is one way to exclude code from the program but keep it as a sort of comment for future reference. If you have problems with GNU make or think youve found a bug, please report it to the developers we cannot promise to do anything but we might well want to x it.(if condition,then-part [,else-part ]) The if function provides support for conditional expansion in a functional context (as opposed to the A number of architectures provide for some form of conditional execution, or predication.

When definecondexec is used, an implicit reference to the predicable instruction attribute is made. See Insn Attributes. GNU make 1 Overview of make 2 An Introduction to Makefiles 3 Writing Makefiles 4 Writing Rules 5 Writing Recipes in Rules 6 How to Use Variables 7 Conditional Parts of Makefiles 8 Functions for Transforming Text 9 How to Run make 10 Using Implicit Rules 11 Using make to Update Archive Macro: AMCONDITIONAL (conditional, condition). The conditional name, conditional, should be a simple string starting with a letter and containing only letters, digits, and underscores.Note that conditionals in Automake are not the same as conditionals in GNU Make. On the x86 versions of Solaris 10, you can find GNU make in /usr/sfw/bin/ gmake.The depth of recursion (sub-make invocation). Primarily for use in conditional statements so that a makefile can act in one way as the top-level makefile and in another way if invoked by another make. But without a true looping operator and conditional processing of some kind the make macro language would be very limited, indeed.6.2.4.3 (or condition1[conditionN]). Available in GNU make 3.81 only. gnu. make or think youve found a bug, please report it to the developers we cannot promise to do anything but we might well want to x it.make evaluates conditionals when it reads a makele. Short Table of Contents7 Conditional Parts of Makefiles12 Extending GNU make (if condition,then-part[,else-part]). The if function provides support for conditional expansion in a functional context (as opposed to the GNU make makefile conditionals such as ifeq (see Syntax of Conditionals). 5.1.6 Conditionals.

Automake has a conditional directive to make parts of Makefile.am files conditional.Automake conditionals will work with any make program, and dont rely on GNU Make conditionals.) 7 Conditional Parts of Makeles bug-makegnu.org or use our Web-based project management tool, at6.2 Conditional Subdirectories A special exception is that the GNU make append operator This is a summary of techniques for implementing a large build system, written in plain GNU make, for a Unix-based C or C codebase.Autoconfs solution is to generate a config.h file full of define directives, and your source code uses ifdef conditionals to provide different implementations for This file documents the GNU make utility, which determines automatically which pieces of a large program need to be recompiledAs this example illustrates, conditionals work at the textual level: the lines of the con-ditional are treated as part of the makefile, or ignored, according to the condition. gnu make - How can I configure my I have the following makefile for my project, and Id like to configure it for release and debug builds.The 7z format initially appeared as Дополнительные изображений: Вопросы и ответы по ключу " gnu make conditional targets" The following example of a conditional tells make to use one set of libraries if the CC variable is gcc, and a different set of libraries otherwise. It works by controlling which of two command lines will be used as the command for a rule. This is done in a console using GNU Make. So, as part of the install, a console window pops open, you see the make file output wiz by as it compiles and links, when finished the console window closes and the installer continues. Hi, I read the GNU make manual and found there are (or condition ) and (and condition ) functions. ( at The following example of a conditional tells make to use one set of libraries if the CC variable is gcc, and a different set of libraries otherwise. It works by controlling which of two command lines will be used as the command for a rule. make evaluates conditionals when it reads a makefile. Consequently, you cannot use automatic variables in the tests of conditionals because they are not defined until recipes are run (see Automatic Variables). --perl-- description "Check GNU make conditionals."runmakewithoptions(makefile,"",getlogfile,0) Create the answer to what should be produced by this Makefile answer "arg1 NOT equal arg2 arg2 equals arg5 arg3 NOT equal arg4 variable is make profile. and get a build appropriate for profiling, while maintaining the ease of use of the existing autoconfiscated system.Id love to switch the conditional off the target called on the command line rather than off a variable in the file, but thisll do for now. I have looked at the Gnu Make manual in the "implicit rules" and "automatic variables" sections but I did not found a better way.This is how automake does this type of configuration. You could also use a make conditional around these lines gnu make file builds some code with the Keil compiler and creates a reg file within this context. The code should be recompiled until the reg fileIf you want a conditional that runs as part of the recipe, then you have to actually make it part of the recipe and use shell conditionals, not make conditionals. Email Sign Up or sign in with. Google. Facebook. Evaluation of files in GNU make conditional.Not the answer youre looking for? Browse other questions tagged gnu-make or ask your own question. The if function provides support for conditional expansion in a functional context (as opposed to the GNU make makefile conditionals such as ifeq (see section Syntax of Conditionals). An if function call can contain either two or three arguments A conditional causes part of a makefile to be obeyed or ignored depending on the values of variables.Conditionals control what make actually "sees" in the makefile, so they cannot be used to control shell commands at the time of execution. GNU make conditional function (if ) inside a user-defined function always evaluates to true. GNU Make strange variable substitutions. Makefile ifeq: when are they evaluated? I need to support makefile syntax that is compatible with standard make (e.g. make on AIX), gmake 3.81, and clearmake (but I cant use the -C gnu option for historical reasons).GMAKEgnumake. I have looked at the Gnu Make manual in the "implicit rules" and "automatic variables" sections but I did not found a better way.This is how automake does this type of configuration. You could also use a make conditional around these lines (if) conditional function evaluates to true when the first argument passed to it is non-empty. In you case the condition is literal text: ifeq "foo" "bar", which is, obviously, non-empty. Ifeq/ifneq conditionals are in fact directives, not functions. A conditional causes part of a makefile to be obeyed or ignored depending on the values of variables.Conditionals control what make actually "sees" in the makefile, so they cannot be used to control shell commands at the time of execution. GNU Make 3.81 Copyright (C) 2006 Free Software Foundation, Inc. This is free software see the source for copying conditions.Take the test out of the rule, and use a Make conditional (which in turn invokes shell functionality), e.g. This should make sure that CTWANTSSTATICLINKy is not used in your .config. theyre reffering to OSX code, and without knowing what YOURE trying to do, we cant help you further. When supporting configuration options already known when building your program we prefer using if ( ) over conditional compilation, as in the former case the compiler is able to perform more extensive checking of all possible code paths. For example, please write. GNU make is a widely used tool for automating software builds. It is the de facto standard build tool on Unix.Instead, you must write override FOO 0. Conditional Syntax. One major weakness of the make language is its limited support for if conditionals. In computer science, conditional statements, conditional expressions and conditional constructs are features of a programming language, which perform different computations or actions depending on whether a programmer-specified boolean condition evaluates to true or false. GNU Make provides a feature to conditionally assign variables using ? operator.Well, it still serves the purpose of conditional assignment, for example, in sub-Makefiles included from the top-level one for cooperative usage.

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