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Date:	Fri, 21 May 2010 16:10:04 +0000 (GMT)
From:	Marco Atzeri <marco_atzeri AT yahoo DOT it>
Subject:	RE: How to compile Fortran 90 subroutine under CYGWIN
To:	cygwin AT cygwin DOT com, bo yu <enviyub2 AT hotmail DOT com>
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--- Ven 21/5/10, bo yu  ha scritto:

> Tim,
>=20=20
> Thanks for your reply.
>=20=20
> I have the new version of cygwin installed in my computer,
> in which the g77, g++, gcc, gfortran, C++ compiler are in
> C:\cygwin\bin.
>=20
> Firstly, I use cygwin build C programs and For77 programs.
> It works very well. Now, I add two For90 programs and want
> to build following program together in cygwin:
>=20=20
> Fortran 77 program:=C2=A0=C2=A0=C2=A0runslhg.f , intrface.f
>=20
> Fortran 90 program:=C2=A0=C2=A0=C2=A0swan_init.f90 ,=C2=A0
> swan_loopstep.f90

gfortran can handle F90 and F77, but in your makefile
you have no rule for ".f90" extension


> C Program:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
> slosh2.c ,=C2=A0 cstart.c etc.
>=20=20
> Step 1: I replace g77 with gfortran in 'makefile',=20
>=20=20
> #!/bin/make
> SHELL =3D /bin/sh
> CC =3D gcc
> F77 =3D gfortran
> STRIP =3D strip
> STD_FLAGS =3D -O3 -Wall -pedantic -ansi
> FFLAGS =3D
> LD_FLAGS =3D -Wl,--stack,8000000
> STD_DEF =3D -D_WINDOWS_ -D_GCC_
> STD_INC =3D -I.
> STD_LIB =3D -lg2c -L/usr/lib -lm
> PRJ_NAME =3D sloshDos
> TARGETS =3D $(PRJ_NAME)
> CFLAGS =3D $(STD_FLAGS) $(STD_DEF) $(STD_INC)
> ############################
> # FILES
> ############################
> H_SOURCES =3D slosh2.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pack.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 myassert.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 myutil.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 savellx.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 complex.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 clock.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 tendian.h \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 tio3.h
> C_OBJECTS =3D slosh2.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pack.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 myassert.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 myutil.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 savellx.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 complex.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 clock.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 tendian.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 tio3.o
> F_OBJECTS =3D runslhg.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 intrface.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 swan_init.o \
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 swan_loopstep.o
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=20
> C_MAIN =3D cstart.c
> ############################
> # TARGETS
> ############################
> all: $(TARGETS)
>  @echo ""
> $(PRJ_NAME): $(C_OBJECTS) $(F_OBJECTS) $(C_MAIN)
> $(LIB_DEPENDS) $(H_SOURCES)
>  $(CC) $(C_MAIN) $(CFLAGS) $(LD_FLAGS) $(C_OBJECTS)
> $(F_OBJECTS) $(STD_LIB) -o $(PRJ_NAME)
>  $(STRIP) -s $(PRJ_NAME).exe
> install:
>  cp *.exe ../../bin
> clean:
>  rm -f *.o *.bak *.BAK
> ############################
> # SUFFIXES
> ############################
> .c.o : $(H_SOURCES)
>  $(CC) -c $(CFLAGS) $<
> .f.o:
>  ${F77} -c ${FFLAGS} $<
>=20=20
>=20
> Step 2: in cygwin, I ran makefile, The error message is
>=20=20
> gcc =E2=80=93c runslhg.f
> gcc =E2=80=93c intrface.f

Why gcc is invoked for Fortran ??
See "10.7 Old-Fashioned Suffix Rules" of info make

> make: *** No rule to make target =E2=80=98swan_init.o=E2=80=99, needed
> by =E2=80=98sloshDos=E2=80=99. Stop

The message is clear. You gave no indication how to make
swan_init.o from swan_init.f90

Try to copy/rename the swan_init.f90 to swan_init.f=20
and see what happens=20

>=20=20
> Step 3: To test if gfortran compiler wotk for For77
> program, I try to build C program and For70 programs only
> using gfortran, I ran makefile, The error message is
>=20=20
> runslhg.o:runslhg.f:,.text+0x4f>: undefined reference to
> '__gfortran_st_read'
> runslhg.o:runslhg.f:,.text+0x6d>: undefined reference to
> '__gfortran_transfer_character'
> runslhg.o:runslhg.f:,.text+0x7b>: undefined reference to
> '__gfortran_st_read_done'
>=20=20

during the linking you need to add the=20
"-lgfortranbegin -lgfortran"

>=20=20
> My Questions are
> (1) Does gfortran work for fortran 90 program only?=20

No. it compiles also F77

> (2) g77 compiler works for fortran 77 programs. Does g77
> work for fortran 90 programs?

I doubt

> (3) How to build C, FOR77 and For 90 programs together in
> cygwin? How to set the makefile, use separete command for
> for77 and for 99?

This is not really a cygwin problem.=20
You should read the make documentation.

>=20=20
>=20=20
> I would appreciate any suggestion what should I look at.
>=20=20
> Thanks again,
> Bo

Regards
Marco






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