Added OMPI_WHICH macro as an alternative to using {{{`which

<prog>`}}} in `configure`. It is preferable to simply using {{{`which
<prog>`}}} because backticks (`) (aka backquotes) invoke a sub-shell
which may source a "noisy" `~/.whatever` file, and we do not want the
error messages to be part of the assignment in {{{foo=`which
<prog>`}}}.

This commit was SVN r16955.

config/ompi_functions.m4

@@ -10,6 +10,7 @@ dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
 dnl                         University of Stuttgart.  All rights reserved.
 dnl Copyright (c) 2004-2005 The Regents of the University of California.
 dnl                         All rights reserved.
+dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -268,6 +269,37 @@ dnl #######################################################################
 dnl #######################################################################
 dnl #######################################################################
 
+# Macro that serves as an alternative to using `which <prog>`. It is
+# preferable to simply using `which <prog>` because backticks (`) (aka
+# backquotes) invoke a sub-shell which may source a "noisy"
+# ~/.whatever file (and we do not want the error messages to be part
+# of the assignment in foo=`which <prog>`). This macro ensures that we
+# get a sane executable value.
+AC_DEFUN([OMPI_WHICH],[
+# 1 is the variable name to do "which" on
+# 2 is the variable name to assign the return value to
+
+OMPI_VAR_SCOPE_PUSH([ompi_prog ompi_file ompi_dir ompi_sentinel])
+
+ompi_prog=$1
+
+IFS_SAVE=$IFS
+IFS="$PATH_SEPARATOR"
+for ompi_dir in $PATH; do
+    if test -x "$ompi_dir/$ompi_prog"; then
+        $2="$ompi_dir/$ompi_prog"
+        break
+    fi
+done
+IFS=$IFS_SAVE
+
+OMPI_VAR_SCOPE_POP
+])dnl
+
+dnl #######################################################################
+dnl #######################################################################
+dnl #######################################################################
+
 # Declare some variables; use OMPI_VAR_SCOPE_END to ensure that they
 # are cleaned up / undefined.
 AC_DEFUN([OMPI_VAR_SCOPE_PUSH],[

config/ompi_setup_cc.m4

@@ -10,6 +10,7 @@ dnl Copyright (c) 2004-2007 High Performance Computing Center Stuttgart,
 dnl                         University of Stuttgart.  All rights reserved.
 dnl Copyright (c) 2004-2006 The Regents of the University of California.
 dnl                         All rights reserved.
+dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -306,6 +307,6 @@ AC_DEFUN([_OMPI_PROG_CC],[
     AC_DEFINE_UNQUOTED(OMPI_CC, "$CC", [OMPI underlying C compiler])
     set dummy $CC
     ompi_cc_argv0=[$]2
-    OMPI_CC_ABSOLUTE="`which $ompi_cc_argv0`"
+    OMPI_WHICH([$ompi_cc_argv0], [OMPI_CC_ABSOLUTE])
     AC_SUBST(OMPI_CC_ABSOLUTE)
 ])

config/ompi_setup_cxx.m4

@@ -12,6 +12,7 @@ dnl Copyright (c) 2004-2006 The Regents of the University of California.
 dnl                         All rights reserved.
 dnl Copyright (c) 2006      Los Alamos National Security, LLC.  All rights
 dnl                         reserved. 
+dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -255,7 +256,7 @@ AC_DEFUN([_OMPI_PROG_CXX],[
     AC_DEFINE_UNQUOTED(OMPI_CXX, "$CXX", [OMPI underlying C++ compiler])
     set dummy $CXX
     ompi_cxx_argv0=[$]2
-    OMPI_CXX_ABSOLUTE="`which $ompi_cxx_argv0`"
+    OMPI_WHICH([$ompi_cxx_argv0], [OMPI_CXX_ABSOLUTE])
     AC_SUBST(OMPI_CXX_ABSOLUTE)
 
     OMPI_CXX_COMPILER_VENDOR([ompi_cxx_vendor])

config/ompi_setup_f77.m4

@@ -12,6 +12,7 @@ dnl Copyright (c) 2004-2005 The Regents of the University of California.
 dnl                         All rights reserved.
 dnl Copyright (c) 2006      Los Alamos National Security, LLC.  All rights
 dnl                         reserved. 
+dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -63,7 +64,7 @@ else
     set dummy $OMPI_F77
     OMPI_F77_ARGV0=[$]2
     BASEF77="`basename $OMPI_F77_ARGV0`"
-    OMPI_F77_ABSOLUTE="`which $OMPI_F77_ARGV0`"
+    OMPI_WHICH([$OMPI_F77_ARGV0], [OMPI_F77_ABSOLUTE])
     
     if test "$OMPI_WANT_F77_BINDINGS" = "0" ; then
         AC_MSG_WARN([*** Fortran 77 bindings disabled by user])

config/ompi_setup_f90.m4

@@ -12,6 +12,7 @@ dnl Copyright (c) 2004-2005 The Regents of the University of California.
 dnl                         All rights reserved.
 dnl Copyright (c) 2007      Los Alamos National Security, LLC.  All rights
 dnl                         reserved. 
+dnl Copyright (c) 2007      Sun Microsystems, Inc.  All rights reserved.
 dnl $COPYRIGHT$
 dnl 
 dnl Additional copyrights may follow
@@ -93,7 +94,7 @@ else
         set dummy $OMPI_F90
         OMPI_F90_ARGV0=[$]2
         BASEF90="`basename $OMPI_F90_ARGV0`"
-        OMPI_F90_ABSOLUTE="`which $OMPI_F90_ARGV0`"
+        OMPI_WHICH([$OMPI_F90_ARGV0], [OMPI_F90_ABSOLUTE])
     fi
 fi
 # make sure the compiler actually works, if not cross-compiling