Re: problem with simple autoconf for fortran

[Steven G. Johnson]

Michael Lemke wrote:

I have these three files (+ the stuff created by autoconf etc): x.F
[...]
$ cat configure.ac
dnl Process this file with autoconf to produce a configure script.
AC_INIT(x,1.0)
AM_INIT_AUTOMAKE

dnl Checks for programs.
AC_PROG_MAKE_SET
AC_PROG_F77
[...]
That went all fine. Then I do a make:
$ make
g77 -DPACKAGE_NAME=\"x\" -DPACKAGE_TARNAME=\"x\" -DPACKAGE_VERSION=\"1.0\" -
DPACKAGE_STRING=\"x\ 1.0\" -DPACKAGE_BUGREPORT=\"\" -DPACKAGE=\"x\" -DVERSION=
\"1.0\" -I. -I. @CPPFLAGS@ -g -O2 -c -o x.o `test -f 'x.F' || echo './'`x.F
g77: cannot specify -o with -c or -S and multiple compilations
make: *** [x.o] Error 1

Why is there a @CPPFLAGS@ ? Isn't that supposed to be replaced by some real
flags? Did I miss something in my configure.ac/Makefile.am?

Try putting AC_PROG_CPP in your configure.ac. When your file is named .F (instead of .f), automake expects that the Fortran compiler is preprocessing it with the C preprocessor and understands CPPFLAGS. However, CPPFLAGS are only set by the AC_PROG_CC/AC_PROG_CPP macros.

Steven


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