gnu-make

I need to get the nth dependency file from a rule, something similar to $n in bash. I need this because I'd like to feed in individual dependency files as options to the build program. Here's an example: dep.o: dep.src config1.cfg config2.cfg parse -cfg1 $2 -cfg2 $3 -o $@ $< Is it possible? dep.o: dep.src config1.cfg config2.cfg @echo the second preq is $(word 2,$^), the third is $(word 3,$^) 来源： https://stackoverflow.com/questions/11424204/how-to-get-the-second-dependency-file-using-automatic-variables-in-a-makefile

Is there a way using GNU Make of compiling all of the C files in a directory into separate programs, with each program named as the source file without the .c extension? Martin Broadhurst SRCS = $(wildcard *.c) PROGS = $(patsubst %.c,%,$(SRCS)) all: $(PROGS) %: %.c $(CC) $(CFLAGS) -o $@ $< I don't think you even need a makefile - the default implicit make rules should do it: $ ls src0.c src1.c src2.c src3.c $ make `basename -s .c *` cc src0.c -o src0 cc src1.c -o src1 cc src2.c -o src2 cc src3.c -o src3 Edited to make the command line a little simpler. SRCS = $(wildcard *.c) PROGS = $(patsubst

There seems to be some controversy on whether the number of jobs in GNU make is supposed to be equal to the number of cores, or if you can optimize the build time by adding one extra job that can be queued up while the others "work". Is it better to use -j4 or -j5 on a quad core system? Have you seen (or done) any benchmarking that supports one or the other? I would say the best thing to do is benchmark it yourself on your particular environment and workload. Seems like there are too many variables (size/number of source files, available memory, disk caching, whether your source directory &

I'm following the instructions of someone whose repository I cloned to my machine. What I want is simple: to be able to use the make command as part of setting up the code environment. But I'm using Windows, and I searched online only to find a make.exe file to download, a make-4.1.tar.gz file to download (I don't know what to do with it next), and things about downloading MinGW (for GNU; but after installing it I didn't find any mention of "make"). I don't want a GNU compiler or related stuff; I only want to use "make" in Windows. Please tell me what I should do to accomplish that. Thanks in

Is there a way to get GNU make to work correctly with filenames that contain colons? The specific problem I'm running into happens to involve a pattern rule. Here's a simplified version that does not depend on cutting and pasting tab characters: % make --version GNU Make 3.81 Copyright (C) 2006 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This program built for x86_64-redhat-linux-gnu % cat Makefile COLON := \: all: ; true %.bar: ; cp $< $@ x.bar: x.foo %.foo:

I've a lot of C files, some have a header (.h), some files not. Here's my makefile : .SUFFIXES: SRC := $(wildard ./src/*.c) OBJ := $(SRC:%.c=%.o) all: $(OBJ) %.o: %.c $(MyNotGCCCompiler) "@../$(*F).cmd" It works fine except that if I change a header file, the target isn't recompiled because not included in the dependencies. How can I manage this case? Thanks The standard approach is to generate header dependencies automatically while compiling. For the first compilation no dependencies are necessary since every source file must be compiled. Subsequent recompilations load dependencies generated

I have an rule that creates a directory bin: -mkdir $@ However after the first time the directory has been generated, I receive this output: mkdir bin mkdir: cannot create directory `bin': File exists make: [bin] Error 1 (ignored) Is there some way I can only run the rule if the directory doesn't exist, or suppress the output when the directory already exists? The traditional way to handle directory creation is to use a stamp file that is depended on and creates the dir as a side effect. Remove the stamp file when making distclean or whatever your "really clean" target is: bin/.dirstamp: mkdir