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From Adam Kocoloski <kocol...@apache.org>
Subject Re: configure: C++ compiler detection improvement
Date Wed, 13 Mar 2013 03:38:17 GMT
Wow, thanks for the detailed report and patch Ben.  Cheers,

Adam

On Mar 12, 2013, at 8:11 PM, Ben Reser <ben@reser.org> wrote:

> Friend of mine was trying to build couchdb today and ran into a problem.
> 
> [[[
> checking jsapi.h usability... no
> checking jsapi.h presence... no
> checking for jsapi.h... no
> checking js/jsapi.h usability... no
> checking js/jsapi.h presence... no
> checking for js/jsapi.h... no
> configure.jm: error: Could not find the jsapi header.
> 
> Are the Mozilla SpiderMonkey headers installed?
> ]]]
> 
> But he clearly had Mozilla Spidermonkey installed:
> [[[
> # locate jsapi.h
> /usr/include/jsapi.h
> /usr/include/js/jsapi.h
> /usr/include/xulrunner-sdk-1.9.2/jsapi.h
> ]]]
> 
> He was stumped and asked me to take a look.  I looked at the
> config.log and found:
> [[[
> configure.jm:16700: checking jsapi.h usability
> configure.jm:16717: g++ -c  -DXP_UNIX
> -I/usr/include/xulrunner-sdk-1.9.2
> -I/usr/include/xulrunner-sdk-1.9.2/js
> -I/usr/include/xulrunner-sdk-1.9.2/mozjs  -I/opt/local/include
> -I/usr/local/include -I/usr/include  conftest.cpp >&5
> ./configure.jm: line 16718: g++: command not found
> ]]]
> 
> You're using AC_PROG_CXX in your configure.ac to find a C++ compiler.
> Unfortunately due to a bug (or misfeature) of autoconf if AC_PROG_CXX
> follows AC_PROG_CC then it won't fail if no C++ compiler is found.
> See:
> http://lists.gnu.org/archive/html/bug-autoconf/2010-05/msg00001.html
> 
> Fortunately, it's relatively easy to work around this.  You can simply
> test that the ac_ct_CXX shell variable is set after running
> AC_PROG_CXX.  I've attached a patch that does so.
> 
> Running configure on a system without a C++ compiler now results in
> the following:
> [[[
> checking for g++... no
> checking for c++... no
> checking for gpp... no
> checking for aCC... no
> checking for CC... no
> checking for cxx... no
> checking for cc++... no
> checking for cl.exe... no
> checking for FCC... no
> checking for KCC... no
> checking for RCC... no
> checking for xlC_r... no
> checking for xlC... no
> checking whether we are using the GNU C++ compiler... no
> checking whether g++ accepts -g... no
> checking dependency style of g++... none
> checking that we found a C++ compiler... no
> configure: error: A C++ compiler is required.
> ]]]
> 
> I'm not subscribed to your dev list so if you'd like to respond to me
> please CC me.  Also my ASF username is breser an ICLA is already on
> file for me.
> <couchdb-c++-configure.patch.txt>


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