[BuildTools-tickets] [BuildTools] #67: Running configure without g++ => cryptic error

[BuildTools]

#67: Running configure without g++ => cryptic error
--------------------------+-------------------------------------------------
Reporter:  plb            |        Owner:  andreasw           
    Type:  enhancement    |       Status:  new                
Priority:  trivial        |    Component:  configuration tests
 Version:  0.5            |   Resolution:                     
Keywords:  configure g++  |  
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Comment (by stefan):

 For the configure run without CXX=gcc, it looks like the AC_PROG_CXX macro
 of autoconf automatically sets CXX to g++ if it '''cannot''' find a C++
 compiler, see
 https://projects.coin-
 or.org/CoinUtils/browser/releases/2.2.5/CoinUtils/configure#L3276

 Thus, the lines
 {{{
 AC_PROG_CXX([$comps])
 if test -z "$CXX" ; then
   AC_MSG_ERROR([Failed to find a C++ compiler!])
 fi
 }}}
 in coin.m4/AC_COIN_PROG_CXX does not catch the error, since $CXX will be
 g++, even though g++ might not work.[[BR]]
 Unfortunately, according to
 [http://www.gnu.org/software/autoconf/manual/html_node/C_002b_002b-
 Compiler.html#index-AC_005fPROG_005fCXX-809 the autoconf manual], this
 seem to be even a desired behaviour, not a bug.

 Any idea how to get around this? Should there be an extra test in
 AC_COIN_PROG_CXX that tests whether the C++ compiler actually works?

 Best,
 Stefan

-- 
Ticket URL: <https://projects.coin-or.org/BuildTools/ticket/67#comment:4>
BuildTools <http://projects.coin-or.org/BuildTools>
Tools for configuring and compiling COIN-OR codes