Help making a makefile from shell script

[instinct2]

Hi, I am trying to build a makefile from a shell script with the following command lines:

cat << EOF > makefile

FFLAGS = -s
LINK = f77 -o
MACH = amach.o

OBJS = driver.o psr.o eqlib.o stanlib.o cklib.o twopnt.o cputim.o \
math.o $(MACH)
EXES = chem.exe psr.exe
INPS = therm.dat chem.inp psr.inp
OUTS = chem.bin chem.out save.bin recov.bin psr.out

chem.exe : ckinterp.o
$(LINK) chem.exe ckinterp.o

psr.exe : $(OBJS)
$(LINK) psr.exe $(OBJS)
EOF

But I ended up getting this errors:
psr.sh: line 4: MACH: command not found
psr.sh: line 4: LINK: command not found
psr.sh: line 4: OBJS: command not found
psr.sh: line 4: LINK: command not found
psr.sh: line 4: OBJS: command not found

and my makefile has blanks where MACH, LINK and OBJS are.

FFLAGS = -s
LINK = f77 -o
MACH = amach.o

OBJS = driver.o psr.o eqlib.o stanlib.o cklib.o twopnt.o cputim.o math.o
EXES = chem.exe psr.exe
INPS = therm.dat chem.inp psr.inp
OUTS = chem.bin chem.out save.bin recov.bin psr.out

chem.exe : ckinterp.o
chem.exe ckinterp.o

psr.exe :
psr.exe


It seems like the shell tries to read the macros instead of writing them into my makefile. Can anyone help me to solve this? Sorry I am new to fortran /linux. Thank you very much.

[atreyu]

you need to escape all the instances of the '$' char, e.g.

psr.exe : \$(OBJS)
\$(LINK) psr.exe \$(OBJS)

[instinct2]

nope it doesnt work. It still blank for $(OBJS) etc in the built makefile, hence exe cant be compiled. Any other ideas?

[atreyu]

i put it all in a shell script and it worked for me. and now that i look at it, i think i need to escape a continuation character, and add a missing continuation character. taking that into account, i made a file called makefile.sh containing this:

cat << EOF > makefile

FFLAGS = -s
LINK = f77 -o
MACH = amach.o

OBJS = driver.o psr.o eqlib.o stanlib.o cklib.o twopnt.o cputim.o \\
math.o \$(MACH)
EXES = chem.exe psr.exe
INPS = therm.dat chem.inp psr.inp
OUTS = chem.bin chem.out save.bin recov.bin psr.out

chem.exe : ckinterp.o \\
\$(LINK) chem.exe ckinterp.o

psr.exe : \$(OBJS) \\
\$(LINK) psr.exe \$(OBJS)
EOF

then i ran it like this:

sh makefile.sh

and it successfully made the makefile.

or am i misunderstanding you, and the makefile is made, but it does not compile properly?

[instinct2]

Yeah you are right with the escape thing and it works for me too if I make a new sh file with the above coding. However, it doesnt work in the original sh file which is trying to make a few files at the same time. I think the problem comes from the following coding which is located in the beginning and end of the sh file.

sh 1> ${1}.log 2>&1 << ENDSH
....
....
....
ENDSH

From the comments, I know the codes are to ensure the sh output will be printed onto a text file instead of screen. But I am not sure why it prevents the backslashes from working.
Running the sh file will make a makefile with $(OBJS) $(LINK) missing and obviously compiling it doesnt work as the makefile is incomplete.

If I remove the above coding, everything works perfectly.

[atreyu]

try adding an additional two escape backslashes before each escape backslash that was added, e.g.:

psr.exe : \\\$(OBJS) \\\\
\\\$(LINK) psr.exe \\\$(OBJS)
EOF

does that work?

[instinct2]

wow it works magically. Thank you very much. But do u know why is that?

[atreyu]

well, i think it is b/c each time you invoke a sub-shell, that sub-shell (Bash) wants to interpolate the variables, indicated by the $ sign. And as I said before, if you want to preserve the $ char, you have to escape it. You have two sub-shells in your code, which means escaping it twice. The first sub-shell is the "sh" at the very beginning, the 2nd one is the "here document" you create using the cat and redirectors.