Makefile filter ifeq. ifeq (,) and the conditional evaluates as true.

Makefile filter ifeq # You may end up recursing into __sub-make twice. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The Makefile used by git is a good example of a Makefile which does non-trivial configuration tasks in the Makefile itself (such as switching on the host type). – The ifeq conditional you have used is processed by Make at parse time, not when the recipe is executed. If you want to conditionalize on an automatic variable like $@, which are only available in the recipe, you This statement: ifeq ($(findstring $@, $(APP_OBJS)), $@) is a Make conditional, and Make will evaluate before executing any rule, and therefore before the automatic variable $@ has a value. Commented Sep 29, 2020 at 13:02. ifeq ($(TEST_FLAG)$(DEBUG_FLAG),TRUEFALSE) do something endif It's also possible to use the Conditional functions, which are more likely to be useful in a loop (as ifeq will probably not do what you expect in a loop, it will be tested exactly once). c -o dummytgt The findstring function is what your heart desires: $(findstring find,in) Searches in for an occurrence of find. MY_DIRNAME=. c', `bar. mk? I need it to do smth like this: IF arch = AREABI_V7 *use path for my arm_v7 static libs* ELSE *use path for arm static libs* I'm trying to use find_j=$(findstring j,$(filter-out --%,$(MAKEFLAGS))) to find if there is -j option, so when I echo $(find_j) the value is j but when I compare it ifeq (j, $(find_j)) this returnes false I cant understand where is the problem my version of make is make-3. /prog $(filter-out $@, $(MAKECMDGOALS)) %: @true super short explanation: filter out current goal from list of goals. Follow You could do this for example using the filter function combined with the origin function ($(if $(filter undefined,$(origin BAR)),quux) Makefile conditional not respecting target-specific variables. Immediate Set VARIABLE := value Setting of a variable with simple expansion of the values inside - values within it are expanded at declaration time. So Make expands "$@" to nothing: ifeq ($(findstring , $(APP_OBJS)),) the findstring returns the empty list since it didn't find a match:. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Makefiles are generally case sensitive, so you need to use ifeq and else, the following works here with GNU Make: ifeq ($(GREP_FINDINGS), ) @echo true else @echo false endif You might also want to check this out. ifeq ($(OS),Windows_NT) You seem to be misunderstanding the way $(if works. cpp #include &lt;iostream&gt; using namespace std Well, the actual answer depends on what you want to compare. Conditionals; ifeq ($(STR1),$(STR2)) makefile lines if true else makefile lines if false endif. 76 has been handled by Paul D. c, baz. The result of the function's processing is substituted into the makefile at the point of the @Beta -- I had a question about your leading spaces: am I correct that the leading spaces must specifically not be tabs? When I try to construct a similar ifeq-block, my editor (vim) tries to indent the next line (after the ifeq-line) with a leading tab. Improve this answer. PHONY: all all: $(eval $(call SOME_FUNC)) After executing "make" command I've got following output: $ make Makefile:10: TRUE Makefile:10: FALSE make: Nothing to be done for 'all'. 6 GB usable) Device ID 140104E8-85AA-3D55-990E-5185A62E169B Product ID 00425-00000-00002-AA904 System type 64-bit operating system, x64-based processor Pen and touch No pen or touch input is The filter function can be used to separate out different types of strings (such as file names) in a variable. /External ifneq "$(wildcard $(MY_DIRNAME) )" "" # if directory MY_DIRNAME exists: INCLUDES += A simple and easy-to-use library to enjoy videogames programming - raylib/examples/Makefile at master · raysan5/raylib Thank you for your answer, a fourth editor helped me fix the indentation issue. Put these together and $(filter-out $@,$(MAKECMDGOALS)) returns the list of targets specified on the command line other than "action", which might be "value1 value2". I found here a nice solution which can be used like this:. Functions allow you to do text processing in the makefile to compute the files to operate on or the commands to use. Date: Tue, 14 Jan 2025 23:23:33 -0300: From: Arnaldo Carvalho de Melo <> Subject: Re: [PATCH FOR-NEXT] perf tools: Expose quiet/verbose variables in Makefile. This is good if you have 4 CPUs say, and a good test of any makefile. For says that foo depends of foo. In your src_file. ifneq ( ,$(filter product_name,$(TARGET_PRODUCT))) endif # TARGET_PRODUCT Problem is, it works for a product_name, but I want it to work also for a product_name1, product_name2, product_surname etc. out test. Conditionals control what make actually “sees” in the makefile, This string, used anywhere in a makefile, is replaced by a space-separated list of names of existing files that match one of the given file name patterns. c gcc-o hello main. Follow In Makefile assign path variable dependent if path exists. This has only a drawback, you will lose any command-line arguments you pass directly to make as make all --silent. s' should be specified Suppose that a makefile uses the VPATH variable to specify a list of directories that make should search ifeq ($(wildcard file1),) CLEAN_SRC = else CLEAN_SRC = *. , are not using automatic variables like $@ or $<), then the answer is to remove the TABs. I want to keep VERBOSE=1 available because we have some scripts that make use of it (and use other makefiles only aware of VERBOSE) The ifeq function and other regular conditionals has no guarantee that the parts will not be expanded if they are not true. e. gcc -c . Makefile Os detection and ifeq not getting triggered. Make executes a makefile in three distinct phases: It reads in the Makefile, building a graph in memory, saving macros/expanding macros as necessary. As long as the condition is static (doesn't rely on the specific recipe or order in which the makefile is read) then it will work. h,nothing) Makefile ifeq ($(wifiSim),1) WIFISIM :=1 endif all: test. @CraigRinger -- just looking at this. Now, without the ifneq, make would:. Makefile: This is my laptop information Device name DESKTOP-RK0Q93P Processor 13th Gen Intel(R) Core(TM) i5-1340P 1. Conditionals. make ALL This approach also works without using . The question is how can I detect whether it is running Windos or Linux in the Makefile? 04-20-2016, 05:58 PM From GNU make, chapter 7. then pass list of goals as arguments to prog. out 1 . Sign in. To recursively call a makefile, use the special $(MAKE) foo = ok all: ifeq ($(foo), ok) echo "foo equals ok" else echo "nope" endif Check if a variable is empty Filtering multiple patterns: You can filter multiple patterns at once. So how could I insert wildcards instead second word? Something like product_*. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Appendix A Quick Reference. Commented Sep 10 Assignments to variables on the command line override the values from the makefile. The way I put it is that conditionals are evaluated at the time the Makefile is read. The result of the function's processing is substituted into the The following is a very simple makefile that does not seem to work properly. I'm looking for a Makefile which is more user friendly in a test environment. /bin/run. PHONY: all all: job1 job2 job3 . 7. You can't use makefile commands (like ifeq etc. Run the recipe for . – s. I played around the code and found that the conditional statements should be written without indentation, and this solved my problem. Returns all whitespace-separated words in text that do not match any of the pattern words, removing the words that do match one or more. h file3 endif Share. You can also combine it with mktemp to store the output into a new tempfile each time, and clean that up as part of the build recipe that consumes whatever you will use this for. that don't depend on the rule being run (e. What you are implementing that way is an include guard, which is not what you want, what you actually need is:. h if WITH_ATS is defined. Also please remove extra whitespaces inside ifeq. , to download a file only if it doesn't currently exist, the following code could be used: ifeq is a make directive. Development since Version 3. Great answer – Aaron D I am writing a Makefile (to use make) to compile a program that has to be multiplatform. # do something. By indenting it with a TAB, you have put it into the recipe, and all commands in the recipe are passed to the shell. Share Functions for Transforming Text. h" #endif That is, to include ats. perf When I have a Makefile that uses else ifneq, the last character is marked as an error, with the text <function>, <include>, <topconditional> define, else, endif, export, identifier, override, private, undefine or vpath expectd, Elixir Cross Referencer - source code of U-boot v2024. See section Functions for String Substitution and Analysis. c. Conditionals can compare the value of one variable to another, or the value of a This variable is only needed if you’d like to set GNU make-specific flags in a POSIX-compliant makefile. $@ is dummytgt $(filter dummytgt,1. Note in some cases command ifeq ( $(FIRST),1 ) may compare with unstriped line and fail because of extra whitespaces: it may compare to '1 ' instead of simple '1' So makefile will looks like C source file. A makefile is a combination of two different languages. – Alexey Nikulin. The current nested structure isn't really a nest - it is a series of if statements: There isn't any use of else. Note: You use the filter function when you want to return a list of words that match 1 Overview of make. If what you want to compare are MAKE things, like make variables etc. The first argument, condition, first has all preceding and trailing whitespace stripped, then is expanded. I have lots of variables called allow_xxx where xxx is a feature. All content provided in this blog is for informational purposes only. Name. ifeq ($(skip-makefile),) # Do not print "Entering directory ", # but we want to display it when entering to the 文章浏览阅读3. The two latter methods, check if the variable was defined rather than if its value I'd like to enable a verbose compilation in my makefile, but I can't figure out how to make a conditional OR. You use a function in a function call, where you give the name of the function and some text (the arguments) for the function to operate on. I've read in linux Makefile: $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make $(Q)@: What is the meaning of $(Q)@:? I'm trying to google it, but google always crappy if the search using some weird character. The if function provides support for conditional expansion in a functional context (as opposed to the GNU make makefile conditionals such as ifeq (see Syntax of Conditionals). exe,$@),fooinc. c, bar. Ask Question Asked 6 years, 5 months ago. I cannot explain why it happens. PHONY: job1 job1: ; . g. al. PHONY: job3 job3: ; . c cc hello. You have to use filter: ifneq (,$(filter $(A),$(B) $(C))) The filter will return B and/or C if they match A, and the ifneq empty string will be true if the filter returns any value. It's actually quite readable and reasonably simple to use. NOTPARALLEL. s should be specified in the command to the compiler. Conditionals control what 'make' actually "sees" in the makefile, so they cannot be used to control recipes at the time of execution. If you don't indent ifeq it will be evaluated when the makefile is read. c and . There are many good answers here already, but I wanted to share a more complete example that both: doesn't assume uname exists on Windows; also detects the processor; The CCFLAGS defined here aren't necessarily recommended or ideal; they're just what the project to which I was adding OS/CPU auto-detection happened to be using. PHONY: job2 job2: ; . deps/%. Conditionals can compare the value of one variable to another, or the value of a variable to a constant string. 9. It contains two arguments, separated by a comma and surrounded by parentheses. Running make with the following Makefile will instantly exit: a = $(shell sleep 3) Running make with the following Makefile will sleep for 3 seconds, and then exit: a := $(shell sleep 3) In the former Makefile, a is not evaluated until it's used elsewhere in the Makefile, while in the latter a is evaluated immediately even though it's not used. Commented Apr 18, 2018 at 11:14. Conditionals affect which lines of the makefile make uses. The problem is that the flag must be passed as a comma-separated string. 10: Makefile It's not clear what you want, or whether you want this trick to work with different targets, or whether you've defined these targets elsewhere, or what version of Make you're using, but what the heck, I'll go out on a limb: In a GNU makefile, I would like to set an output variable to one value I am able to achieve what I want using the filter function: TRUE_HOSTS = hal9000 pipboy TEST_OUTPUT = $(if $(filter $(TEST_INPUT),$ "ifeq" conditional syntax in makefile. 文章浏览阅读2. this will allow you to write something like this $ make run arg1 arg2 ifeq (a,b) ifeq "a" "b" ifeq 'a' 'b' ifneq (a,b) ifneq "a" "b" ifneq 'a' 'b' else endif Conditionally evaluate part of the makefile. 0 GB (15. I'm using make in Windows and I need to manipulate some variables to create a filename. Because I use the Makefile Tutorial - learn make by example . How to filter-out bracket in Makefile. Makefile Tutorial - learn make by example . In a directory 'test' following files are present: prerit@vvdn105:~/test$ ls hello hello. From the make info docs: $(if CONDITION,THEN-PART[,ELSE-PART])' The `if' function provides support for conditional expansion in a functional context Conditionals affect which lines of the makefile make uses. cpp test. Gnu make treats lines joined with \ as a single line. You can use ifeq with a concatenation of your values, eg. ifeq ($(origin FOO), undefined) FOO = bar endif Note that a variable set to an empty value is still defined, so The following Makefile is not working and I am not sure what's going on. h but only foo. 1. Makefile has four conditional statements: ifeq (two values are equal), ifneq (two values are not equal), ifdef (value is defined), and ifndef (value is not defined). sources = foo. 2. need to be on their own line, rather like #ifdef in C (if that's any help to you). Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Makefile. h, $(files)) will select all . Makefile can be trick, normaly i do some thing like # turn them into do-nothing targets $(eval toto:;@:) my_test: ifeq (toto, $(filter toto,$(MAKECMDGOALS))) @echo 'toto is defined' else @echo 'no toto around' endif The trick with makefile syntax is that when a line after a target begins with a tab character, this lines is not a make statement anymore, but rather is passed (after $ variables and functions are evaluated) to the shell, as a command that is supposed to build the target. This is what I try to do: allow_feat1 := 1 I found an example here showing how to implement the OR logic to check for different values for a flag. I capture the intent of the Makefile in pseudo code, then indicate the issues I have. Go to the previous, next section. And how do I add multiple selections if the syntax is like ifeq ($(VAR1),some-string) combined with ifeq ($(VAR2),some-other-string) – rubo77 Commented Jul 25, 2018 at 11:36 Make now has all it needs to build dummytgt (according to your makefile), so now it expands the command block. make -j5 will run 5 shell commands at once. cpp : test. -f $ (CURDIR)/ Makefile $ (filter-out _all sub-make, $ (MAKECMDGOALS)) # Leave processing to above invocation of make: skip endif # ifeq ($(KBUILD_SRC),) # We process the rest of the Makefile if this is the final invocation of make: ifeq ($ (skip-makefile),) # Do not print "Entering directory ", # but we want to display it when entering -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) # Leave processing to above invocation of make. Adding java directory to my path automatically. In the example above the ifeq is indented. This way the user have to specify the values of those variables only if the defaults are not suitable. #ifdef WITH_ATS #include "ats. Example. 2, Syntax of Conditionals: "Often you want to test if a variable has a non-empty value. Multiple if statements in makefile conditionals. GNU Make: shell cat file yields contents without newlines. It will be used in a unix-shell or in a Windows(MSDOS) cmd. Basically, you want make to see something like:. Note that, in your C source file, WITH_ATS is just an empty macro (i. The make utility automatically determines which pieces of a large program need to be recompiled, and issues commands to recompile them. I would rather not have nested if/else without indentation if I don't have to. Contribute to YosysHQ/yosys development by creating an account on GitHub. So you have to find a way to construct a statement which, when evaluated, will expand to a non-empty string if you want the then-part and an empty string if you want the else part. Makefile: Filter out strings containing a character. So in the end i can't found any Manual about it. You'd have to do something like ifeq ($(MAKECMDGOALS),$(filter-out clean,$(MAKECMDGOALS))) – ifeq (,$(filter %686 %x86 %i86 %amd64,$(MACHINE))) IS_X86 = 0 else IS_X86 = 1 endif Alternatively, you could create something based on $(findstring ) or other GNU make text functions. ifeq (run,$(firstword $(MAKECMDGOALS))) # use the rest as arguments for "run" Various statements in a makefile. c (say). All commands outside of recipes are makefile commands. run: # . c 2. See section Including Other Makefiles. Improve this I want to write a function which would return different values depending on argument. I've written: define function ifeq($(1),a) aaaa else bbbb endif endef $(info MSG: $(call function,a)) I get Is there any way to use conditional expressions in Android. Note, the Makefile and Bash has different syntax. That's what I was referring to. So is it really just a funky syntax for a case statement, or is each 'else ifeq' independent. Functions for Transforming Text. Note, while this ifeq : 判断语句，用于比较两个参数是否相等，相等则该语句通过。 如果a和b相等，则do something. h' but only `foo. When the value results from complex expansions of variables and functions, expansions you would consider empty may actually contain whitespace characters and thus are not seen as empty. 2w次，点赞12次，收藏46次。Makefile语句某项目中mk文件中，用到了ifneq和filter。发现它们俩搭配时，蛮有用的。ifneq语句ifneq : 判断语句，用于比较两个参数，如果两个参数不等，则该语句通过# 如果a和b不相等，则do somethingifneq ($(a), $(b)) # do somethingendiffilter语句filter:_ifneq filter The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they are ignored. So make reads your Makefile, your conditional is false and it You can use filter: ifeq (,$(filter clean help showvars,$(MAKECMDGOALS))) then check var and fail if not set. Getting this warning like below. filter-out is a function that removes some elements from a list. This variable will be seen by GNU make and ignored by other The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they are ignored. Besides working around your current problem, using such GNU make language feature is also more efficient than forking left and right via $(shell). In the makefile of my project, there's code which is similiar to this: ifneq ($(MAKECMDGOALS), rebuild) Better is to use filter which is exact word matches: GOALS := rebuild rerun distclean clean mostlyclean dep-clean tools tools-clean ifeq (,$(filter $(GOALS),$(MAKECMDGOALS))) include $(DEPENDENCIES) endif Share. I want to compile all the files located in src/ directory to bc/%. Let me explain: I want to be able to specify a verbose compilation either by setting V=1 or VERBOSE=1. 90. The ifeq directive begins the conditional, and specifies the condition. Makefile define variable using if. $(filter pattern,text) Select words in text that match one of the pattern words. Provide details and share your research! But avoid . What is the story with $(OS) , and can anyone provide docs on this? Every environment variable that make sees when it starts up is transformed into a make variable with the same name and value. makefile try to execute also the remaining string so the error: make: *** No rule to make target `my'. c bar. Viewed 467 times 0 . Yosys Open SYnthesis Suite. c) expands to 1. override variable = value override variable:= value override The second top answer mentions ifeq, however, it fails to mention that this ifeq must be at the same indentation level in the makefile as the name of the target, e. If no existing file name matches a pattern, then that pattern is omitted from the output of the wildcard function. Lazy Set VARIABLE = value Normal setting of a variable, but any other variables mentioned with the value field are recursively expanded with their value at the point at which the variable is used, not the one it had when it was declared. Asking for help, clarification, or responding to other answers. , it doesn't have any value Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company . c ifeq (,$(filter clean,$(MAKECMDGOALS)) include $(sources:. $(filter-out pattern,text) Select words in text No, there is no and operator for the conditionals (but there is a and function that can be used in conditionals). one can use the filter function. c and baz. sh $(filter-out $@,$(MAKECMDGOALS)) @echo $(filter-out $@,$(MAKECMDGOALS)) But when I run as example: >make run my custom input params my custom input params make: *** No rule to make target `my'. o: main. This is the exact opposite of the filter function. If what you want to compare IS depending on the rule being run, then you have to convert the make I had a case where I wanted to define a variable based on the test whether a directory exists or not at the top-most level of the Makefile where the approaches described above don't work. Note this only works if A, B, and C consist of a single word. See Special Built-in Target Names, Catalogue of Built-In Rules, and Summary of Options, for other summaries. The first proposal in the answer you found tests whether variables are the empty string or not. If you want a conditional for a Make variable when expanding It does not look like any Makefile has logics like this from the examples I see. Every quoting character you write in a makefile will be kept as a literal quote and passed along as-is to the commands that make invokes. Execute the include $(DFILES) line. Alternatively, one could write ifneq ($(filter cpp,$(MAKECMDGOALS)),) to test that the result of $(filter) is not an empty string. However, an explicit assignment in the makefile, or with a command argument, overrides the environment. And you can't use shell commands (like $(echo )) in the makefile (outside of a recipe). Here is a summary of the directives GNU make recognizes: . The correct usage of the Makefile is one of the below. If the condition is true, make reads the lines of the text-if-true as part of the makefile; if the condition is false, make ignores those lines completely. Negation: If you want to select all elements that do not match a pattern, you can use filter A conditional causes part of a makefile to be obeyed or ignored depending on the values of variables. Saved searches Use saved searches to filter your results more quickly Now create a file called Makefile in the same directory as your main. find_j=$(findstring -j,$(filter-out --%,$(MAKEFLAGS))) ifneq ( , $(find_j)) $ make Makefile:4: Extraneous text after `else' directive Makefile:6: *** commands commence before first target. For example, sets ‘ frobozz ’ to ‘ yes ’, while: sets ‘ frobozz ’ to ‘ no ’. I have a Makefile with content: define SOME_FUNC ifeq (n,y) $(warning TRUE) else $(warning FALSE) endif endef . Check out the links (in particular the first one) for a bit of elaboration. All I want to do is to call a function inside another function in an "if" statement. ifeq et. You can use the filter function to do this: PARAMS := a b c ifneq ($(filter $(ENV_PARAM),$(PARAMS)),) $(info $(ENV_PARAM) exists in $(PARAMS)) else $(info $(ENV_PARAM) does not exist in $(PARAMS)) endif Read: "if the result of searching for the ENV_PARAM value in PARAMS is not empty, run the 'true' block else run the 'false' block". The ifeq and the likes are evaluated at the moment when make reads the makefile, that means there is no actual ifeq present in the assigned value of your It should look something like this: VARIABLE=true define test_ifeq $(eval FOO := $(if $(filter $(VARIABLE),true), true, false)) echo "value: $(FOO)" endef all: $(call test_ifeq) NOTE: I Let's suppose you've just untarred the archive, and for whatever reason you want to run make clean before anything else. c you need neither #ifndef nor #define. Given the following ifeq statements, You can use the filter function for this: ifeq ($(OS), Linux) foo endif ifneq (,$(filter $(OS),Darwin FreeBSD NetBSD)) bar endif Share. The if, and and or conditional functions consider that the empty string is false and that anything else is true (including strings containing only spaces). Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they are ignored. The shell has no idea what an ifeq command is, and can't understand all the parens here, so you get these errors. Makefile: run based on test of variable. make CATEGORY=parser TEST=basic. – MadScientist. It contains two arguments, separated by a comma Filtering multiple patterns: You can filter multiple patterns at once. . c -o lib clean: rm -f lib demo Demo has the main function and ifeq ($(OS), Windows_NT) IS_WINDOWS = 1 else IS_WINDOWS = 0 endif This $(OS) in a conditional, I can't find docs on it anywhere. c -o demo lib: ${CC} ${CFLAGS} lib. Use saved searches to filter your results more quickly. just want to conditionally call a particular target or set of targets based on a variable, for example: ifeq ($(BUILD_ENV),"development") clean: -clean else clean: -clean-info endif ifeq ($(BAR),) FOO +=quux endif Share. But running make on that Makefile seems to fail because (I think) make is interpreting the leading tab to mean a recipe. The ifeq then compares the result of the $(filter) function to the sought word: if equal, then the block til endif is parsed/executed. /a. 90 GHz Installed RAM 16. Makefile require round quotes around variable, bash - not. 99. This manual describes GNU make, which was implemented by Richard Stallman and Roland McGrath. So $(filter-out bar, foo bar baz) returns foo baz (it can be more subtle, but we don't need subtlety here). ifeq ($(skip-makefile),) # Do not print "Entering directory ", # but we want to display it when entering to the THE major reason to use make IMHO is the -j flag. c makefile In makefile a rule is defined as follows: hello:hello. I always see TEST PASSED. Editing the makefile as per suggestion from @MadScientist (i. However, you can look into the question: How to detect if the In a makefile I'm trying to run a shell command and capture the output in a make variable do something if the variable is not empty I've created this simplified makefile to demonstrate my The ifeq and family of conditionals are evaluated when parsing the Makefile. define variable define variable = define Since the functions don’t share any state, the only way to pass data between them is through writing and reading files. All commands in recipes are expanded and sent to the shell. If you do an ifeq ($1,) inside of the macro, the $1 is not expanded until the $(call is expanded, and thus it is valid to use the ifeq inside of the define (though I wouldn't recommend that practice) – HardcoreHenry Makefile语句 某项目中mk文件中，用到了ifneq和filter。发现它们俩搭配时，蛮有用的。 ifneq语句 ifneq : 判断语句，用于比较两个参数，如果两个参数不等，则该语句通过 # 如果a和b不相等，则do something ifneq ($(a), $(b)) # do something endif filter语句 filter: By default, the goal is the first target in the makefile (not counting targets that start with a period). Anyone see what I am doing wrong here? EDIT: ok. 3. -f $ (CURDIR)/ Makefile $ (filter-out _all sub-make, $ (MAKECMDGOALS)) # Leave processing to above invocation of make: skip endif # ifeq ($(KBUILD_SRC),) # We process the rest of the Makefile if this is the final invocation of make: ifeq ($ (skip-makefile),) # Do not print "Entering directory ", # but we want to display it when entering AND && in ifeq in makefile. If there is no indentation, Make will treat it as a directive for itself; otherwise, it's regarded as a shell script. o : c++ test. skip endif # ifeq ($(KBUILD_SRC),) # We process the rest of the Makefile if this is the final invocation of make. For example, $(filter %. Based on my recent answer to this other question Force Makefile to execute script after building any target (just before exiting), it was very easy to do what you would like. It follows that syntactic units of the makefile, such as rules, may safely be split across the beginning or the end of the conditional. TEST=ON buildbegin: ifeq ($(TEST),ON) @echo TEST PASSED else @echo TEST FAILED endif No matter what I set the TEST variable to, my ifeq statement passes. Share 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)). I don't know why you keep trying to use filter-out, when I wrote filter above. The macro $< is empty when your script is parsed so your recipe only ever contains the latter two lines. Using ifeq in makefile to compile either C or CPP file. $(wildcard *. c' and `baz. ifeq ($(GCC_MINOR),$(filter $(GCC_MINOR),4 5)) filter X, A B will return those of A,B that are equal to X. If it occurs, the value is find; otherwise, the value is empty. Related. d) endif One use of specifying a goal is if you want to compile only a part of the program, or only one of several programs. And syntax is not correct. ) in a shell script. / Makefile blob: ce2f83a684f67ed4529e9753315d465e355d98fe [] [] [] [] I have a Makefile with a set of booleans which must be used to control the flags for an external application. c', `baz. also create a catch all target (%) which does nothing to silently ignore all the other "goals". ifeq (,) and the conditional evaluates as true. out 3 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) # If --no-print-directory is unset, recurse once again to set it. s,$(sources)) -o foo says that `foo' depends of `foo. conditional check against list of strings in GNU makefile command. c because the $(DFILES) variable contains files with names that I want a different version of the clean target to run based on whether make dev or make prod are run on a makefile. Smith. Stop. Modified 6 years, 5 months ago. If the variable variable-name has an empty value, the text-if-true is effective; I've tried ifneq ($(WNDAP660),$(filter $(WNADAP620),y y)), but it is not working. -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS)) # Leave processing to above invocation of make. Make: filtering a list of files containing a given word. I'm trying to setup a Makefile that will search and copy some files (if-else condition) and I can't figure out what exactly is wrong with it? The answer is to use Make ifeq or ifneq. Hi, Can anybody help mw how to use 2 conditinal directives in makefile (with AND=&&), so far none of my tries succedded. Indeed, it will be difficult to use filter-out for this test. 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)). It contains To test for an empty value, use ifeq ($(foo),). ifeq is not a valid command for the shell. The else directive causes the following lines to be obeyed if the previous conditional failed. c %. Makefile 条件判断作用条件语句可以根据一个变量的值来控制 make 执行或者时忽略 Makefile 的特定部分，条件语句可以是两个不同的变量或者是常量和变量之间的比较。下面是条件判断中使用到的一些关键字：关键字功能ifeq判断参数是否不相等，相等为 true NOTE: The make tool reads the makefile and checks the modification time-stamps of the files at both the side of ':' symbol in a rule. filter: 过滤语句，过滤掉不符合指定的模式的内容，仅保 This conditional uses three directives: one ifeq, one else and one endif. The ifneq directive begins the conditional, and specifies the condition. Tricky makefile OS := $(shell uname) ifeq $(OS) Darwin # Run MacOS commands else # check for Linux and run other commands endif Share. It will return all the words in the list that do not match clean which is not so helpful here. d: %. If you're doing string comparison with a single word then $(filter ) is a good option: depends_on = $(if $(filter the_file. Want to see if there are other ways to achieve this. s' and `ugh. c=. This appendix summarizes the directives, text manipulation functions, and special variables which GNU make understands. I've never heard of DASH run: prog . – Beta. For example. You seem rather confused over what make does. I have a base filename and an optional part to append. Make: detect platform with regex. include file-include file sinclude file Include another makefile. c file, and paste the following into it: main. 0. I could make up for this differences using ifeq clauses. chromium / external / qemu / refs/heads/master / . This feels normal in other languages but seems to be not so common in Makefile. branch := $(shell git rev-parse --abbrev-ref HEAD) ifeq ($(branch), master) ami_regions = us-west-2 endif show_regions: echo $(ami_regions) How could this ifeq statement be written as a one-liner, where the variable is set if the condition passes, otherwise sets the variable as another value or simply leaves it unset? A conditional directive causes part of a makefile to be obeyed or ignored depending on the values of variables. Contribute to vampy/Makefile development by creating an account on GitHub. Makefile filter-out not removing a file from a list of files. CC = gcc CFLAGS = -Wall -g demo: ${CC} ${CFLAGS} demo. h files from the files list. out 2 . A makefile here has nested if statements to assign variable values and targets to be built. (If the ‘-e’ flag is specified, then values from the environment override assignments in the makefile. But it’s still worthwhile looking at some makefile s from real-life projects to see what people have done with From the docs: $(filter PATTERN,TEXT) Returns all whitespace-separated words in TEXT that do match any of the PATTERN words, removing any filter function in Makefile. If the two strings match exactly (except for leading or trailing whitespace), then the first set of lines is used; no_implicit_load $(filter-out dir1 dir2, *) I am trying to find how to use regular expressions in a makefile, for example: foo: ifeq ($(bar),^ver[0-9]+) do something else ($(baz),word) do something else endif When i type (Makefile use DASH for default interpreter ). For more info, see $(filter) and ifeq in GNU Make documentation. bc. For example, given: The makefile s shown throughout this book are industrial strength and quite suitable for adapting to your most advanced needs. o . GNU make Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Opinions expressed here are my own and do not represent the views of my current or past employers. Couple of weeks later i'm more confortable with make and haven't tried yet a condition. In the example above, this means that the second alternative linking command is used whenever the first alternative is not used. See section Conditional Parts of Makefiles. But I just want to pass a single param without values (start, not start=yes) to 2 make commands: run and run_whatever (example names)For the run command I am using:. 3w次，点赞22次，收藏92次。1. You can use this function in a conditional to test for the presence of a specific substring in a given string. c -o hello ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) # If --no-print-directory is unset, recurse once again to set it. a space after the ifeq): I'd probably define a function to test one path (using subst and ifeq), and return the path if it contains usr/bin and an empty string if it doesn't, then feed the list to the function by means of foreach. Before doing the include proper, it would. From my understanding, "target" is like a function. When comparing something with the empty string `' using ifeq or ifneq, cc $(filter %. $(filter-out pattern,text) ¶. I thought that C's && will work, but alas, played with (), spaces and etc. c) is of course empty (and always will be!) ${GCC} is gcc (say) ${CFLAGS} is empty (say) Thus the shell gets. The lines of the makefile following the ifeq are obeyed if the two arguments match; otherwise they are ignored. s and ugh. ouchene. I know I can do this: ifeq ($(option), 1) CC=gcc else ifeq ($(myhostname), "johnsLaptop") CC=johnsCompiler else CC=mipsel-linux-gcc endif endif But thats ugly. Presumably, it is already clean. makefile ifeq ignores 1st choice and accepts 2nd choice. Yes, you can. I would like to create a variable inside my makefile with all values that are allowed. $ (filter-out _all sub-make $ (CURDIR)/ Makefile, $ (MAKECMDGOALS)) _all: sub-make # Invoke a second make in the output directory, passing relevant variables sub - make : Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. jhlo tmwlt llx hraz puyxag auzji jfv gdggre hjessw cjsjhvb