Re: test fails when no C++ compiler is available

[Ralf Wildenhues]

[ dropping bug-automake, adding autoconf-patches ]

Hi Jim, Eric,

* Jim Meyering wrote on Tue, May 12, 2009 at 11:30:40AM CEST:
> > I've just built automake-from-git on a newly-installed system
> > that lacked a C++ compiler.  It failed like this:

> > 220. compile.at:204: 220. Multiple languages (compile.at:204): FAILED 
> > (compile.at:249)
> >
> > tests/testsuite.dir/220/config.log:
> >
> >   configure:2973: result: no
> >   configure:3003: checking a simple C program that is not valid C++
> >   configure:3018: gcc -c -g -O2  conftest.c >&5
> >   configure:3018: $? = 0
> >   configure:3019: result: ok
> >   configure:3040: checking a simple C++ program that is not valid C
> >   configure:3054: g++ -c   conftest.cpp >&5
> >   ./configure: line 1401: g++: command not found
> >   configure:3054: $? = 127

> >   configure:3058: result: failed
> >   configure:3060: error: could not compile test program

Thanks for the bug report.  I'm proposing the following patch to fix
this test failure, that doesn't care about the AC_PROG_CXX glitch.
OK?

Thanks,
Ralf

    testsuite: skip `Multiple languages' test without C++ compiler.
    
    * tests/compile.at (Multiple languages): Skip test on systems
    without a C++ compiler.
    Report by Jim Meyering.

diff --git a/tests/compile.at b/tests/compile.at
index 6ca4ef4..20398fb 100644
--- a/tests/compile.at
+++ b/tests/compile.at
@@ -2,8 +2,8 @@
 
 AT_BANNER([Low level compiling/preprocessing macros.])
 
-# Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007, 2008 Free Software
-# Foundation, Inc.
+# Copyright (C) 2000, 2001, 2003, 2005, 2006, 2007, 2008, 2009  Free
+# Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -219,6 +219,24 @@ AC_COMPILE_IFELSE([
 AT_CHECK_AUTOCONF
 AT_CHECK_CONFIGURE
 
+# This test should be skipped on systems without a C++ compiler.
+AT_DATA([configure.ac],
+[[AC_INIT
+
+AC_PROG_CXX
+AC_LANG_PUSH([C++])
+AC_COMPILE_IFELSE([
+  AC_LANG_PROGRAM([[
+    #ifndef __cplusplus
+    choke me
+    #endif
+  ]])], [], AS_EXIT([77]))
+AC_LANG_POP([C++])
+]])
+
+AT_CHECK_AUTOCONF
+AT_CHECK_CONFIGURE
+
 AT_DATA([configure.ac],
 [[AC_INIT