makefile head-scratcher: multiple targets in one go
Hi!
I've got a build process where scripts create multiple targets from their sources. But here I'm running into a conceptual problem of GNU make: If one has multiple targets in a dependency, make applies the rules once for every target that is out of sync - which is correct for normal compiling, but not here.
Lets say running myscript abcd.conf creates the files a.txt b.txt c.txt and d.txt in one go, and the script should be run if any of the targets are out of sync.
but that would run mysript abcd.conf four times when abcd.conf gets updated, with $@ pointing at each target in turn . As mysript is quite time- and resource-consuming, this is something I need to avoid. As any of the target files might get out of sync, I can't just select one to force a single run.
I've read the make documentation up and down to no avail, and found nothing useful on Google. My experiments so far have failed, and I'm fresh out of ideas.
I always considered make to be the "swiss army knife" of automated building processes, and used it for quite some odd things over the years, but now I could use some input:
Is that what I want to achieve even possible with GNU make or do I have to look for other options (perl or shell scripts are no problems)?
Is there something in the make documentation that I failed to see or understand properly?
Anyone out there with a clever makefile trick for this?
Hi,
I am getting the following error while building on Solaris 64 , while I am trying to build.
Error Snippet :-
----------------------
Makefile:57: *** multiple target patterns. Stop.
make: Leaving directory `/work1/patch/vds6053sun64o/vobs/jvi'
make: *** Error 2
make: Leaving directory... (0 Replies)
Hi All
I need to parse the target
something like:
ifeq '$@' 'first'
echo 1 $@
endif
ifeq '$@' 'second'
echo 2 $@
endif
The thing is to be able compare the target string to any string and then do the commands
Thanks a lot
ziv (0 Replies)
Greetings!
I'm fairly new to the unix world and I hope someone here can help me with my question. I'm using a Makefile to run a few programs and the final output is several .eps files. However I need them to be .pdf files, so I want to use epstopdf to convert the files.
Since I'm already... (6 Replies)
Hi All
I am creating a makefile and I want to do a clean section.
In the clean section I would like to check if the file exists and then delete it.
I always have an error 'unexpected end of file'
What's wrong in it?
Thanks
msntn
firstCpp: first.cpp
g++ -o first first.cpp
clean:
... (1 Reply)
Hi,
As part of our project, we need to load historical data for a year before our system is live. We have the data feed files that we need to load. However, I need to make sure that the file structure (number of fields separated by a comma) on the field is same for all the files of the same... (1 Reply)
I have the following part of a makefile and want to simplify it
using rules rather than having to code the same two blocks
when I need ti build another program.
An having difficulty doing it
all: 1dvel2 1dvel 2dvel
... (8 Replies)
I am trying to create executables for the following files
Currently, I am making 9 different directories for for each. I would like to make 1 directory but everytime I try it does not work.
CROSS_COMPILE?=
# CROSS_COMPILE used to = arm-arago-linux-gnueabi... (1 Reply)
Hello,
I want to merge multiple files (under hundreds folders) side by side. File name are the same but folder are different.
like
folder1/same_name.txt
folder2/same_name.txt
folder3/same_name.txt
......Normally it can be done as
paste /different_path*/same_name.txt > merged_file.txtbut... (2 Replies)
Hi,
I have a question related to makefile. I'm new to makefile and I'm in the process of writing a makefile for my RBT build. I have multiple source files and when I compile them I will get multiple object files (one object file for each source file). I'm having problem in creating a target for... (1 Reply)
Discussion started by: Anand Venkatesa
1 Replies
LEARN ABOUT OSX
md
md(1) BSD General Commands Manual md(1)NAME
md -- process raw dependency files produced by cpp -MD
SYNOPSIS
md [-d] [-f] [-m makefile] [-u makefile] [-o outputfile] [-v] [-x] [-D c|d|m|o|t|D]
DESCRIPTION
The md command basically does two things:
Process the raw dependency files produced by the cpp -MD option. There is one line in the file for every #include encountered, but there are
repeats and patterns like .../dir1/../dir2 that appear which should reduce to .../dir2. md canonicalizes and flushes repeats from the depen-
dency list. It also sorts the file names and "fills" them to a 78 character line.
md also updates the makefile directly with the dependency information, so the .d file can be thrown away (see d option). This is done to
save space. md assumes that dependency information in the makefile is sorted by .o file name and it procedes to merge in (add/or replace [as
appropriate]) the new dependency lines that it has generated. For time efficiency, md assumes that any .d files it is given that were cre-
ated before the creation date of the "makefile" were processed already. It ignores them unless the force flag [f] is given.
FLAG SUMMARY -D c|D|d|m|o|t
Specify debugging option(s):
c show file contents
D show very low level debugging
d show new dependency crunching
m show generation of makefile
o show files being opened
t show time comparisons
-d Delete the .d file after it is processed
-f Force an update of the dependencies in the makefile, even if the makefile is more recent than the .n file. (This implies that md has
been run already.)
-m makefile
Specify the makefile to be upgraded. The defaults are makefile and then Makefile.
-o outputfile
Specify an output file (other than a makefile) for the dependencies.
-u makefile
Like -m, but the file will be created if necessary.
-v Set the verbose flag.
-x Expunge old dependency information from the makefile.
SEE ALSO make(1)BUGS
Old, possibly not used by anyone.
HISTORY
The md utility was written by Robert V. Baron at Carnegie-Mellon University.
BSD June 2, 2019 BSD
02-05-2011
makefile head-scratcher: multiple targets in one go