The programs bellow fails to link against lapack library from the atlas
package:
% gfortran -L/sw/lib -llapack -lcblas -lf77blas -latlas test_dgesv.f
/usr/bin/ld: Undefined symbols:
___powisf2 referenced from liblapack expected to be defined in libgcc
___powidf2 referenced from liblapack expected to be defined in libgcc
collect2: ld returned 1 exit status
This is with gcc43 4.3.3-1000 and atlas 3.8.2-2 on MacOS 10.4.11 PPC.
The powisf2 and powidf2 symbol are defined in
/sw/lib/gcc4.3/lib/libgcc_s.1.dylib. Indeed the program links fine if
one add -lgcc_s.1 to the link command:
% gfortran -L/sw/lib -llapack -lcblas -lf77blas -latlas -lgcc_s.1 test_dgesv.f
Why does this library need to be added by hand? Is it a bug in atlas on
10.4/PPC? The same program compiles well on 10.5 without -lgcc_s.1.
PROGRAM TEST_DGESV
C...Resolution d'un systeme lineaire
IMPLICIT NONE
DOUBLE PRECISION MAT
DOUBLE PRECISION VEC
DIMENSION MAT(4,4)
DIMENSION VEC(4)
INTEGER I
INTEGER INFO
INTEGER IPIV
DIMENSION IPIV(4)
C...Elements de la matrice MAT
C...Premiere ligne
MAT(1,1)=1
MAT(1,2)=2
MAT(1,3)=3
MAT(1,4)=4
C...Deuxieme ligne
MAT(2,1)=4
MAT(2,2)=1
MAT(2,3)=2
MAT(2,4)=3
C...Toisieme ligne
MAT(3,1)=5
MAT(3,2)=6
MAT(3,3)=1
MAT(3,4)=2
C...Quatrieme ligne
MAT(4,1)=-7
MAT(4,2)=-8
MAT(4,3)=-9
MAT(4,4)=1
C...Elements du vecteur VEC
VEC(1)=-10
VEC(2)=-4
VEC(3)=-12
VEC(4)=-22
C...Resolution de A*X=B
C...DGESV(N,NRHS,A,LDA,IPIV,B,LDB,INFO)
CALL DGESV(4,1,MAT,4,IPIV,VEC,4,INFO)
C...En sortie, MAT contient sa decomposition LU
C...En sortie, la solution est dans VEC
C...En sortie, INFO=0 si tout va bien
C...En sortie, IPIV contient la liste des permutations
WRITE(6,*)'INFO=',INFO
WRITE(6,*)'LISTE DES PERMUTATIONS:'
DO I=1,4
WRITE(6,*)'IPIV(',I,')=',IPIV(I)
ENDDO
C...Affichage du resultat (1,-2,3,-4)
WRITE(6,*)'SOLUTION DE MAT*X=VEC:'
DO I=1,4
WRITE(6,*)'X(',I,')=',VEC(I)
ENDDO
END PROGRAM TEST_DGESV
------------------------------------------------------------------------------
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