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configure judges that ifort can not understand -c and -o together.

From: 井口 雄介
Subject: configure judges that ifort can not understand -c and -o together.
Date: Tue, 22 Nov 2005 17:40:11 +0900

Dear all,

For making Makefile for Intel Fortran Compiler 9.0 whose command name is ifort,
I wrote `configure.in' as follow,
---from here---
---until here---

and ran autoconf and `./configure'.
--- output from here
checking for ifort... ifort
checking for Fortran 77 compiler default output... a.out
checking whether the Fortran 77 compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU Fortran 77 compiler... no
checking whether ifort accepts -g... yes
checking whether ifort understand -c and -o together... no
--- output until here

Although `configure' judges that ifort does not understand
 -c and -o together in the last line, this is obviously misjudgment.

In the `config.log', the corresponding part is as follows.
--- log from here
configure:1600: checking whether ifort understand -c and -o together
configure:1624: ifort -g -c conftest.c -o conftest.o >&5
ifort: Command line warning: no action performed for specified file(s)
configure:1627: $? = 0
configure:1641: result: no
--- log until here

Surprisingly, `configure' judges the Fortran compiler characteristics by
C program named `conftest.c'.

Therefore, I have rewritten the `configure' as follows.
> ac_ext=F
< /* confdefs.h.  */
> C* confdefs.h.  */
< /* end confdefs.h.  */
> C* end confdefs.h.  */
>       program main
< int
< main ()
< {
<   ;
<   return 0;
< }
>       end

After that, `configure' judges that ifort understand -c and -o

My environment is as follows:

Redhat linux 9.0 for x86
autoconf (GNU Autoconf) 2.57
GNU bash, version 2.05b.0(1)-release (i386-redhat-linux-gnu)
ifort (IFORT) 9.0  20051020

  Yusuke Iguchi

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