Compile Fortran source with Accelerate Framework (LAPACK and BLAS)

Question

I wish to compile Fortran source code which uses functions from LAPACK and BLAS. When I compile a single source code file e.g.

gfortran -g -framework accelerate test.f

it works.

However, I have many source code files which I want to compile through Makefile. When I modify my Makefile by adding:

LDFLAGS= -framework Accelerate

(Not sure it is the right way but that's how someone seemed to do it) I get the error that the lapack function used inside is unrecognized.

Can someone tell me what modification to do in the makefile?

Here is the error I get:

gfortran -g test.o  -o a.out
Undefined symbols for architecture x86_64:
  "_sgesv_", referenced from:
     _MAIN__ in test.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
make: *** [a.out] Error 1

sgesv is the lapack subroutine being called which shall be included in veclib/accelerate framework.

Here is the copy of my Makefile:

#
#              
#
#FFLAGS = -fast
#FFLAGS = gfortran
FC = gfortran
LFLAGS = gfortran -g
LINK = gfortran -g
LDFLAGS = -framework Accelerate
OBJECTS = test.o\

SOURCES = test.f\

a.out:  $(OBJECTS)
    $(LINK) $(OBJECTS) -o a.out

For others:

Here was what I was doing wrong. The last line should change: $(LINK) $(OBJECTS) -o a.out $(LDFLAGS)

Isn't capitalization important (notice `accelerate` and `Accelerate`)? You definitely have to post the error message. — Vladimir F Героям слава, Jun 08 '15 at 17:39
@Vladimir F, I don't think the capitalization matters here. But just to make sure I changed both to lower and upper case and even tried the example I run from terminal both ways too. It works regardless. — Danish Habib, Jun 08 '15 at 18:47
Show your Makefile, ho is $LDFLAGS used there? Notice that you do NOT have any accelerate in the link command in your error message. You must get it there. — Vladimir F Героям слава, Jun 08 '15 at 18:51

Alexander Vogt · Accepted Answer · 2015-06-08T19:40:48.917

1

The compiler tells you that it cannot find sgesv, which is (in your case) part of the accelerate framework. From the error message, I see that the command resulting from the Makefile is

gfortran -g test.o  -o a.out

which is missing the linker directive.

So, within the Makefile you are missing the link flags in the actual command:

a.out:  $(OBJECTS)
    $(LINK) $(OBJECTS) -o a.out $(LDFLAGS)

edited Jun 08 '15 at 19:40

answered Jun 08 '15 at 19:16

Alexander Vogt

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Added it. Same error. – Danish Habib Jun 08 '15 at 19:23
Can you see the framework directive in the command/error message? – Alexander Vogt Jun 08 '15 at 19:26
This works. @Alexander Vogt There was a typo in the original makefile. – Danish Habib Jun 08 '15 at 19:31
1

@DanishHabib You should accept the answer if it solves the problem. – Vladimir F Героям слава Jun 08 '15 at 19:36
I did now. Sorry new to this website. You guys are awesome. Also, I see now that the question has been answered elsewhere too. Shall I delete this now? Also, the other question is not something that I came up to as a noob. – Danish Habib Jun 08 '15 at 19:44

Compile Fortran source with Accelerate Framework (LAPACK and BLAS)

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