Conditionally setting FLAGS variable in makefile

[GeoMX]

I have my program version saved to a version.h file and would like to set the value of a FLAGS variable according to the content of this file.

I'm trying to do something like this:


VERSION=`cat version.h`
ifneq (,$(findstring "beta", $(VERSION)))
@echo "nothing"
else
@echo "it's beta"
FLAGS=-g
endif

But it does not work. First, I get messages expressing I can't place operations before targets, if I place a dummy target before this, the FLAGS variable never sets.

Thanks in advance for all of your help

[GeoMX]

More information :).

The contents of version.h can be one of these:


#define VERSION "0.1 beta"

#define VERSION "0.1"

The makefile:

VERSIONH=`cat version.h`
VERSION=$(findstring beta, $(VERSIONH))
ifeq ($(VERSION),)
FLAGS =
else
FLAGS = -g
endif

version: version.c
cc -o version version.c $(FLAGS)
@echo "VERSIONH: $(VERSIONH)"
@echo "VERSION: $(VERSION)"
@echo "FLAGS: $(FLAGS)"

Output of make command when version.h contains the beta word:

cc -o version version.c -g
version.h: #define VERSION "0.1 beta"
version:
flags:

And when beta is not present:

version.h: #define VERSION "0.1"
version:
flags:
It seems findstring is the problem, do you have any advice on how to get it working?

[gmargo]

I think I've got it working; see if you can adapt this. I've got two version files so both can be tested at once:



$ cat version1.h
#define VERSION "0.1"

$ cat version2.h
#define VERSION "0.1 beta"

$ cat version.makefile
VERSION1 := $(shell cat version1.h)
VERSION2 := $(shell cat version2.h)
FLAGS1=
FLAGS2=

ifneq (,$(findstring beta, $(VERSION1)))
FLAGS1=-g
endif
ifneq (,$(findstring beta, $(VERSION2)))
FLAGS2=-g
endif

all:
@echo "VERSION1 = \"$(VERSION1)\""
@echo "VERSION2 = \"$(VERSION2)\""
@echo "FLAGS1 = \"$(FLAGS1)\""
@echo "FLAGS2 = \"$(FLAGS2)\""

$ make -f version.makefile
VERSION1 = "#define VERSION 0.1"
VERSION2 = "#define VERSION 0.1 beta"
FLAGS1 = ""
FLAGS2 = "-g"

[diesch]

Why not just


FLAGS=$(shell grep -q beta version.h && echo -- '-g')

[GeoMX]

I think I've got it working; see if you can adapt this. I've got two version files so both can be tested at once:



VERSION1 := $(shell cat version1.h)


Thank you, using shell and := everything works correctly :).


Why not just


FLAGS=$(shell grep -q beta version.h && echo -- '-g')
It seems a nicer way, I just had to remove the two dashes after the echo.

FLAGS=$(shell grep -q beta version.h && echo '-g')
Just one more question, how would I set an alternative value as in the else clause for the ieq/ineq?

THANK YOU so much for your help.