Makefile prerequisite

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How to Use Variables. A variable is a name defined in a makefile to represent a string of text, called the variable's value. These values are substituted by explicit request into targets, prerequisites, commands, and other parts of the makefile. (In some other versions of make, variables are called macros.) The above makefile results in the definition of a target ‘target’ with prerequisites ‘echo’ and ‘built’, as if the makefile contained target: echo built, rather than a rule with a recipe. Newlines still present in a line after expansion is complete are ignored as normal whitespace. So even if your makefile has no pattern rules, this could still be affecting you. I noticed a few things: Asking to explicitly make the prerequisite works. This shows that make knows how to build the prerequisite. Adding an explicit target statement (not using a pattern rule) for a particular file seemed to solve the problem.

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Jul 10, 2006 · With second expansion the prerequisite list of any rule under goes a second expansion (the first expansion happens when the Makefile is read) just before the rule is used. By escaping any $ signs with a second $ it\'s possible to use GNU Make automatic variables in the prerequisite list. For prerequisites which are archive members, only the named member is used (see Archives). A target has only one prerequisite on each other file it depends on, no matter how many times each file is listed as a prerequisite. So if you list a prerequisite more than once for a target, the value of $^ contains just one Sep 27, 2018 · Creating a simple GCC Makefile in Linux using C Language. Makefile contains recipes implemented on various files to achieve a target. A target is the output file which is created by linking and compiling the base files. We are going to use GCC compiler to Makefile contains recipes implemented on various files to achieve a target. Sep 27, 2018 · Creating a simple GCC Makefile in Linux using C Language. Makefile contains recipes implemented on various files to achieve a target. A target is the output file which is created by linking and compiling the base files. We are going to use GCC compiler to Makefile contains recipes implemented on various files to achieve a target.

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Makefile: create prerequisite from a list. Ask Question Asked 1 year, 10 months ago. Active 1 year, 10 months ago. Viewed 536 times 1. 1. The usual way ... This “chaining” of targets to prerequisites to targets to prerequisites is typical of how make analyzes a makefile to decide the commands to be performed. The next prerequisite make considers is lexer.o. Again the chain of rules leads to lexer. c but this time the file does not exist. Makefile variable as prerequisite. In a Makefile, a deploy recipe needs a environment variable ENV to be set to properly execute itself, whereas others don't care, eg: ENV = .PHONY: deploy hello deploy: rsync . I have 2 libraries in 2 different directories that I build with Makefiles. library B depends on library A. If I modify a .cpp file in library A and run lib B's Makefile can I have B's makefile to automatically rebuild library A? I am now rebuilding A, followed by B... but I'd like B to... (0 Replies) Makefile variable as prerequisite. In a Makefile, a deploy recipe needs a environment variable ENV to be set to properly execute itself, whereas others don't care, eg: ENV = .PHONY: deploy hello deploy: rsync . This is great since we can write simple Makefiles to get the job done in style. link Quick primer on make link Introduction . make is a build tool from the 70s. Builds are described in files known as Makefiles. Your project's Makefile will typically live in its root directory. Makefiles are composed of rules that look like this: Makefile variable as prerequisite. In a Makefile, a deploy recipe needs a environment variable ENV to be set to properly execute itself, whereas others don't care, eg: ENV = .PHONY: deploy hello deploy: rsync .

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The above makefile results in the definition of a target ‘target’ with prerequisites ‘echo’ and ‘built’, as if the makefile contained target: echo built, rather than a rule with a recipe. Newlines still present in a line after expansion is complete are ignored as normal whitespace. will do, too; but keep in mind that order-only prerequisites are a GNU extension to the syntax of Makefile, hence not fully portable. EDIT. If, in addition, you want bar and foo to be rebuilt when baz is modified, then the only feasible solution is the first one.

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A Makefile defines a graph of rules for creating a target (or targets). Its purpose is to do the minimum amount of work needed to update a target to the most recent version of the source. Famously written over a weekend by Stuart Feldman in 1976, it is still widely used (particularly on Unix and Linux) despite many competitors and criticisms. defined in the Makefile. By convention, the first rule in the Makefile is often called all or default, commonly listing all valid build targets as prerequisites. make only executes the rule if the target is out-of-date, meaning either it doesn't exist or its modification time is older than any of its prerequisites.

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Any rules in the last example lead to the same commands and differed in their prerequisites only. For those rules that have no prerequisites (e.g. socks) I don't even need an implicit rule. The explicit ones can be pooled, because of their commands being all identic. Thus I get a shorter and pretty clear Makefile: A10. NMAKE 4 Intro Data Structures & SE Dependency Hierarchy prog main.obj unit1.obj unit2.obj main.cpp unit1.cpp unit1.h unit2.cpp unit2.h NMAKE builds an implicit dependency hierarchy for the system: • The dependency hierarchy is checked by NMAKE to determine if a file is up-to-date when it is used in a prerequisite list. There are actually two different types of prerequisites understood by GNU make: normal prerequisites such as described in the previous section, and order-only prerequisites. A normal prerequisite makes two statements: first, it imposes an order in which recipes will be invoked: the recipes for all prerequisites of a target will be completed before the recipe for the target is run.

A file "can be made" if it is mentioned explicitly in the makefile as a target or a prerequisite, or if an implicit rule can be recursively found for how to make it. When an implicit prerequisite is the result of another implicit rule, we say that chaining is occurring. See section Chains of Implicit Rules. Makefile tricks. GNU make is an extremely powerful program, and can be used to automate the building and testing of software. The only problem with using it is that makefile syntax is rather cryptic, and debugging complex makefiles can be difficult. If a dependency relationship is incorrect, then a file may not be rebuilt when it needs to be. Other targets are updated as well if they appear as prerequisites of goals, or prerequisites of prerequisites of goals, etc. By default, the goal is the first target in the makefile (not counting targets that start with a period). A file "can be made" if it is mentioned explicitly in the makefile as a target or a prerequisite, or if an implicit rule can be recursively found for how to make it. When an implicit prerequisite is the result of another implicit rule, we say that chaining is occurring. See section Chains of Implicit Rules. Sep 09, 2015 · You should also have a list of prerequisite modules / etc. Making your users stumble upon them leaves a bad first impression. This comment has been minimized. Sign in to view

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The practice we recommend for automatic prerequisite generation is to have one makefile corresponding to each source file. For each source file name.c there is a makefile name.d which lists what files the object file name.o depends on. That way only the source files that have changed need to be rescanned to produce the new prerequisites. This is great since we can write simple Makefiles to get the job done in style. link Quick primer on make link Introduction . make is a build tool from the 70s. Builds are described in files known as Makefiles. Your project's Makefile will typically live in its root directory. Makefiles are composed of rules that look like this: I have 2 libraries in 2 different directories that I build with Makefiles. library B depends on library A. If I modify a .cpp file in library A and run lib B's Makefile can I have B's makefile to automatically rebuild library A? I am now rebuilding A, followed by B... but I'd like B to... (0 Replies) This “chaining” of targets to prerequisites to targets to prerequisites is typical of how make analyzes a makefile to decide the commands to be performed. The next prerequisite make considers is lexer.o. Again the chain of rules leads to lexer. c but this time the file does not exist. Getting basename and notdir to work in prerequisite (dependency) list. Tag: makefile. I'm trying to write a Makefile to make generating some figures automatic and ... Makefile Syntax A Makefile consists of a set of rules. A rule generally looks like this: targets : prerequisities command command command. The targets are file names, seperated by spaces. Typically, there is only one per rule. The commands are a series of steps typically used to make the target(s).

Writing Rules. A rule appears in the makefile and says when and how to remake certain files, called the rule's targets (most often only one per rule). It lists the other files that are the prerequisites of the target, and commands to use to create or update the target. automatic variables: descriptions [email protected] The file name of the target $< The name of the first prerequisite $^ The names of all the prerequisites $+ prerequisites listed more than once are duplicated in the order A Makefile defines a graph of rules for creating a target (or targets). Its purpose is to do the minimum amount of work needed to update a target to the most recent version of the source. Famously written over a weekend by Stuart Feldman in 1976, it is still widely used (particularly on Unix and Linux) despite many competitors and criticisms. To use this makefile to delete the executable file and all the object files from the directory, type: make clean : In the example makefile, the targets include the executable file `edit', and the object files `main.o' and `kbd.o'. The prerequisites are files such as `main.c' and `defs.h'. In fact, each `.o' file is both a target and a prerequisite.

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The one-page guide to Makefile: usage, examples, links, snippets, and more. Other targets are updated as well if they appear as prerequisites of goals, or prerequisites of prerequisites of goals, etc. By default, the goal is the first target in the makefile (not counting targets that start with a period). Suffix rules cannot have any prerequisites of their own. If they have any, they are treated as normal files with unusual names, not as suffix rules. GNU Make supports suffix rules for compatibility with old makefiles but otherwise encourages usage of pattern rules.