Makefile Variable Assignment

Makefile Variable Assignment-75
2) PHONY is needed because otherwise make will create an automatic rule of “cc all.o f1.o f2.o -o all TODO why was this not a problem when I didn’t use the % wildcard?4.11 Double-Colon Rules are rarely used, but allow the same target to run commands from multiple targets.But the examples we’ve seen have only scratched the surface.

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We use it to make a temporary file, that doesn’t interfere with others if there is some parallel builds going on. This is the magic that generates prereqs automatically, by looking at the code itself 3) The purpose of the sed command is to translate (for example): main.o : main.c defs.h into: main.o main.d : main.c defs.h 4) Running 5.2 Note only: the default shell is /bin/sh.

You can change this by changing the variable SHELL 5.4 Make stops running a rule (and will propogate back to prerequisites) if a command returns a nonzero exit status.

5.6 The export directive takes a variable and makes it accessible to sub-make commands.

In this example, “cooly” is exported such that the makefile in subdir can use it. Use the special $(MAKE) instead of “make” because it will pass the make flags for you and won’t itself be affected by them.

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Visit Stack Exchange I have a Makefile that has a variable that needs to have a default value in case when variable is unset or if set but has null value. I need this, as I invoke make inside a shell script and the value required by the makefile can be passed from the shell as

Visit Stack Exchange I have a Makefile that has a variable that needs to have a default value in case when variable is unset or if set but has null value. I need this, as I invoke make inside a shell script and the value required by the makefile can be passed from the shell as $1.

This distinction will become more clear as we proceed.

A variable name can contain almost any characters including most punctuation.

# 2) If there is no blah.c file, the implicit rule will not run and will not complain.

4.8 Multiple Targets: We can use the wildcard % in targets, that captures zero or more of any character Note 1) We do not use *.o, because that is just the string *.o, which might be useful in the commands, but is only one target and does not expand.

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Visit Stack Exchange I have a Makefile that has a variable that needs to have a default value in case when variable is unset or if set but has null value. I need this, as I invoke make inside a shell script and the value required by the makefile can be passed from the shell as $1.This distinction will become more clear as we proceed.A variable name can contain almost any characters including most punctuation.# 2) If there is no blah.c file, the implicit rule will not run and will not complain.4.8 Multiple Targets: We can use the wildcard % in targets, that captures zero or more of any character Note 1) We do not use *.o, because that is just the string *.o, which might be useful in the commands, but is only one target and does not expand.# Adding PHONY to a target will prevent make from confusing the phony target with a file name.# In this example, if clean is created, make clean will still be run.Other macro languages you may be familiar with are the C preprocessor, allows you to define a shorthand term for a longer sequence of characters and use the shorthand in your program.The macro processor will recognize your shorthand terms and replace them with their expanded form.will delete the target of a rule if the rule fails in this manner.This will happen for all targets, not just the one it is before like PHONY.

.This distinction will become more clear as we proceed.A variable name can contain almost any characters including most punctuation.# 2) If there is no blah.c file, the implicit rule will not run and will not complain.4.8 Multiple Targets: We can use the wildcard % in targets, that captures zero or more of any character Note 1) We do not use *.o, because that is just the string *.o, which might be useful in the commands, but is only one target and does not expand.# Adding PHONY to a target will prevent make from confusing the phony target with a file name.# In this example, if clean is created, make clean will still be run.Other macro languages you may be familiar with are the C preprocessor, allows you to define a shorthand term for a longer sequence of characters and use the shorthand in your program.The macro processor will recognize your shorthand terms and replace them with their expanded form.will delete the target of a rule if the rule fails in this manner.This will happen for all targets, not just the one it is before like PHONY.

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Comments Makefile Variable Assignment

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