[mpich-commits] r10622 - mpich2/trunk

[goodell at mcs.anl.gov]

Author: goodell
Date: 2012-11-19 11:56:07 -0600 (Mon, 19 Nov 2012)
New Revision: 10622

Modified:
   mpich2/trunk/configure.ac
Log:
tt#1570: "no" means no for f77/fc/cxx

When --disable-LANG is passed to configure, set the corresponding
language variables to "false" to prevent searching for a working
compiler when the user specifically disabled that language.

If this commit causes any problems, revert it.  We lived without
problems without it for many years, so this isn't a critical feature.

Reviewed by balaji at .

Modified: mpich2/trunk/configure.ac
===================================================================
--- mpich2/trunk/configure.ac	2012-11-19 17:54:41 UTC (rev 10621)
+++ mpich2/trunk/configure.ac	2012-11-19 17:56:07 UTC (rev 10622)
@@ -650,6 +650,18 @@
 dnl AS_IF) around these macros in an effort to save configure time.  It will
 dnl lead to weird AM_CONDITIONAL errors and potentially other problems.
 
+# Before attempting to find valid compilers, set the corresponding precious
+# shell variable to "false" (the program/builtin that always fails) for any
+# languages that have been disabled by the user with "--disable-LANG".  This
+# should save a bit of configure time and also prevent user complaints like
+# ticket #1570.
+AS_IF([test "x$enable_f77" = "xno"],[F77=false])
+AS_IF([test "x$enable_fc"  = "xno"],[FC=false])
+# Set CXXCPP=$CPP so that we don't fail the (fatal) preprocessor sanity check.
+# At least as of autoconf-2.69, this sanity test does not check for any
+# C++-specific headers.
+AS_IF([test "x$enable_cxx" = "xno"],[CXX=false ; CXXCPP=$CPP])
+
 # suppress default "-g -O2" from AC_PROG_CXX
 : ${CXXFLAGS=""}
 AC_PROG_CXX([PAC_CXX_SEARCH_LIST])