./configure not detecting missing g++

[Ronald Bradford]

Compiling thoughts error:

 g++ -DDEFAULT_BASEDIR=\"/usr/local\" -DDATADIR=\"/usr/local/var\" -DDEFAULT_CHARSET_HOME=\"/usr/local\" -DSHAREDIR=\"/usr/local/share/drizzle\" -DDEFAULT_HOME_ENV=MYSQL_HOME -DDEFAULT_GROUP_SUFFIX_ENV=MYSQL_GROUP_SUFFIX -DDEFAULT_SYSCONFDIR=\"/usr/local/etc\" -DHAVE_CONFIG_H -I. -I../include -I.. -I../include -I../include -O -g -fno-implicit-templates -fno-exceptions -fno-rtti -W -Wall -Wextra -std=gnu++98 -pedantic -Wundef -Wredundant-decls -Wno-long-long -Wno-strict-aliasing -Werror -c my_new.cc -fPIC -DPIC -o .libs/my_new.o
env: g++: No such file or directory
make[1]: *** [my_new.lo] Error 1
make[1]: Leaving directory `/home/rbradfor/bzr/drizzle/mysys'
make: *** [all-recursive] Error 1

Searching shows no g++

$ dpkg -l | grep g++
ii g++-3.4 3.4.6-6ubuntu5 The GNU C++ compiler
$ which g++

Reviewing previous output (from successful configure shows)

./configure
...
checking for g++... no
...
/configure: line 6173: g++: command not found
checking "C++ compiler version"... "g++ ./configure: line 6176: g++: command not found"
...
config.status: creating support-files/drizzle-log-rotate
config.status: creating include/config.h
config.status: executing depfiles commands
config.status: executing default commands

[Monty Taylor (mordred)]

We need to AC_MSG_ERROR if we don't find a valid C++ compiler.