[CMake] FORTRAN and BLAS Issue

[Matthew Clay]

Fellow cmake users:

I am experiencing a minor issue with cmake, and can't seem to find an 
answer browsing the web. I have a minimal working example that 
highlights the issue with my main code. The problem is this: compiling 
by myself with gfortran and the appropriate flags produces no errors, 
while attempting to build the code with cmake throws an error.

The FORTRAN code--note that DDOT is the call to BLAS that I want to make:

PROGRAM TEST
   IMPLICIT NONE
   DOUBLE PRECISION,DIMENSION(2) :: x,y  ! The two vectors.
   REAL(KIND=8),EXTERNAL :: DDOT         ! Their dot product.
   x(:) = (/ 1.,100. /)
   y(:) = (/ 1.,1. /)
   WRITE (*,*) DDOT(2,x,1,y,1)
END PROGRAM TEST

What works:

gfortran test.f90 -O3 -lblas
./a.out

What doesn't work:

cmake_minimum_required(VERSION 2.8)
project(collision)
enable_language(Fortran)
FIND_PACKAGE(BLAS REQUIRED)
add_definitions(-O3 -lblas)
add_executable(collision test.f90)

Upon attempting [ mkdir build && cd build && cmake .. && make ] as with 
any other code I get the following result:

Scanning dependencies of target collision
[100%] Building Fortran object CMakeFiles/collision.dir/test.f90.o
Linking Fortran executable collision
CMakeFiles/collision.dir/test.f90.o: In function `MAIN__':
test.f90:(.text+0x7d): undefined reference to `ddot_'
collect2: error: ld returned 1 exit status
make[2]: *** [collision] Error 1
make[1]: *** [CMakeFiles/collision.dir/all] Error 2

It appears that BLAS is not being linked with the code...maybe? I am not 
a cmake expert, and would greatly appreciate any words of wisdom for 
troubleshooting this problem!

Thanks,
Matt
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