configure fails with non-C++11 compatible compiler

[pghmcfc]

Regular configure tries to run the configure script in the test directory by default, and that requires C++11. Hence c-ares build is no longer compatible with a plain C89 compiler. Is there an easy way of turning this off short of hacking out the AC_CONFIG_SUBDIRS line for the test directory?

...
config.status: creating Makefile
config.status: creating libcares.pc
config.status: creating ares_config.h
config.status: creating ares_build.h
config.status: executing depfiles commands
config.status: executing libtool commands
=== configuring in test (/builddir/build/BUILD/c-ares-1.11.0/test)
configure: running /bin/sh ./configure --disable-option-checking '--prefix=/usr'  '--build=x86_64-redhat-linux-gnu' '--host=x86_64-redhat-linux-gnu' '--target=x86_64-redhat-linux-gnu' '--program-prefix=' '--exec-prefix=/usr' '--bindir=/usr/bin' '--sbindir=/usr/sbin' '--sysconfdir=/etc' '--datadir=/usr/share' '--includedir=/usr/include' '--libdir=/usr/lib64' '--libexecdir=/usr/libexec' '--localstatedir=/var' '--sharedstatedir=/usr/com' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--disable-dependency-tracking' '--disable-silent-rules' '--disable-static' '--enable-shared' 'build_alias=x86_64-redhat-linux-gnu' 'host_alias=x86_64-redhat-linux-gnu' 'target_alias=x86_64-redhat-linux-gnu' 'CFLAGS=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --cache-file=/dev/null --srcdir=.
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for x86_64-redhat-linux-gnu-g++... no
checking for x86_64-redhat-linux-gnu-c++... no
checking for x86_64-redhat-linux-gnu-gpp... no
checking for x86_64-redhat-linux-gnu-aCC... no
checking for x86_64-redhat-linux-gnu-CC... no
checking for x86_64-redhat-linux-gnu-cxx... no
checking for x86_64-redhat-linux-gnu-cc++... no
checking for x86_64-redhat-linux-gnu-cl.exe... no
checking for x86_64-redhat-linux-gnu-FCC... no
checking for x86_64-redhat-linux-gnu-KCC... no
checking for x86_64-redhat-linux-gnu-RCC... no
checking for x86_64-redhat-linux-gnu-xlC_r... no
checking for x86_64-redhat-linux-gnu-xlC... no
checking for g++... g++
checking whether the C++ compiler works... yes
checking for C++ compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C++ compiler... yes
checking whether g++ accepts -g... yes
checking for style of include used by make... GNU
checking dependency style of g++... none
checking whether g++ supports C++11 features by default... no
checking whether g++ supports C++11 features with -std=c++11... no
checking whether g++ supports C++11 features with -std=c++0x... no
configure: error: *** A compiler with support for C++11 language features is required.
configure: error: ./configure failed for test

[bagder]

Oh right. We should add an option to skip the tests... I'll work on a patch.

[bagder]

Thanks for pointing this out. You can also just remove that AC_CONFIG_SUBDIRS([test]) line and rerun autoconf in your directory to get a quick fix.

[pghmcfc]

Patch works fine thanks.

[nagaramvijay]

same error came while configuring the c-ares_1.11.0 with solaris_12.3 cc compiler. Even i tried removing the AC_CONFIG_SUBDIRS([test]) line in configure.ac file but the same issue again repeating.
I have added the lines which you have given even that doesn't worked out.

[pghmcfc]

You need to run autoconf to generate a new configure script that incorporates the changes made in configure.ac.

[RogelioQuintanaRomero]

hi
solved the problem using the following url
http://hiltmon.com/blog/2015/08/09/c-plus-plus-11-on-centos-6-dot-6/

[cnrting]

yum install gcc-c++