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Top Forums Shell Programming and Scripting GFORTRAN error in makefile installation Post 302911937 by Perderabo on Monday 4th of August 2014 04:43:02 PM
Old 08-04-2014
I am not really familiar with modern fortran. But is not g++ a compiler for the C++ language? Maybe you should try a fortran compiler? To test my guess I wrote a little "hello world" program in fortran. This might be my first fortran program since the 1970's, so slide me some slack here. Wow, I see that I must start my statements in column 7 still! But anyway here is ....

Code:
$
$
$ cat ftest.f
       program HelloWorld
       write (*,*) "Hello, world!"
       end program HelloWorld

$
$
$ g++ ftest.f -o ftest
/usr/lib/gcc/x86_64-redhat-linux/4.1.2/../../../../lib64/crt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
/tmp/cckZ95tO.o: In function `MAIN__':
ftest.f:(.text+0x1b): undefined reference to `_gfortran_set_std'
ftest.f:(.text+0x50): undefined reference to `_gfortran_st_write'
ftest.f:(.text+0x66): undefined reference to `_gfortran_transfer_character'
ftest.f:(.text+0x72): undefined reference to `_gfortran_st_write_done'
collect2: ld returned 1 exit status
$
$
$
$
$ gfortran ftest.f -o ftest
$ ./ftest
 Hello, world!
$
$

My little experiment suggests that my guess was right. Fortran code works well with the fortran compiler. But it doesn't really work with the C++ compiler. So I suggest that you switch to a fortran compiler.
This User Gave Thanks to Perderabo For This Post:
 

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CONFIG.GUESS(1) 						   User Commands						   CONFIG.GUESS(1)

NAME
config.guess - guess the build system triplet SYNOPSIS
config.guess [OPTION] DESCRIPTION
The GNU build system distinguishes three types of machines, the `build' machine on which the compilers are run, the `host' machine on which the package being built will run, and, exclusively when you build a compiler, assembler etc., the `target' machine, for which the compiler being built will produce code. This script will guess the type of the `build' machine. Output the configuration name of the system `config.guess' is run on. Operation modes: -h, --help print this help, then exit -t, --time-stamp print date of last modification, then exit -v, --version print version number, then exit ENVIRONMENT VARIABLES
config.guess might need to compile and run C code, hence it needs a compiler for the `build' machine: use the environment variable `CC_FOR_BUILD' to specify the compiler for the build machine. If `CC_FOR_BUILD' is not specified, `CC' will be used. Be sure to specify `CC_FOR_BUILD' is `CC' is a cross-compiler to the `host' machine. CC_FOR_BUILD a native C compiler, defaults to `cc' CC a native C compiler, the previous variable is preferred REPORTING BUGS
Report bugs and patches to <config-patches@gnu.org>. Originally written by Per Bothner. Copyright 1992-2016 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
autoconf(1), automake(1), autoreconf(1), autoupdate(1), autoheader(1), autoscan(1), config.guess(1), config.sub(1), ifnames(1), libtool(1). GNU Autoconf 2.69 August 2017 CONFIG.GUESS(1)
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