Add c++ support in a autotools project? - c++

Question

I am now writing an app that need using c++ in my c code.My problem is i can't compile through the c++ code.
i have two source folders,cpp (contains only a c source file ) and src (contains only a c++ source file ).
my configure.in is just like this,very simple
AC_PREREQ([2.68])
AC_INIT([tste], [1.0], [ee#b.com])
AC_PROG_CXX
AC_PROG_CC
AC_CANONICAL_SYSTEM
AM_INIT_AUTOMAKE()
AC_CONFIG_FILES([Makefile cpp/Makefile src/Makefile] )
AC_OUTPUT
./Makefile.am:
SUBDIRS= src cpp
./cpp/Makefile.am:
bin_PROGRAMS=main
main_SOURCES=main.c
./src/Makefile.am:
bin_PROGRAMS=test
test_SOURCES=testcpp.cpp
When i using make to compile my project , the error occurs:
Making all in src
make[1]: Entering directory `/home/hujin/Desktop/test/src'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/home/hujin/Desktop/test/src'
Making all in cpp
make[1]: Entering directory `/home/hujin/Desktop/test/cpp'
make[1]: *** No rule to make target `main.o', needed by `main'. Stop.
make[1]: Leaving directory `/home/hujin/Desktop/test/cpp'
make: *** [all-recursive] Error 1

Answer 1

If I was in your skin, I wouldn't have split the project in submakefiles since it all goes to a single target ("tste").
You better put all of your source files in the root Makefile.am (you can generate more than one output from it):
# ./Makefile.am:
bin_PROGRAMS=main test
main_SOURCES=cpp/main.c
test_SOURCES=src/testcpp.cpp
Change your configure.acto something like:
# configure.ac
AC_PREREQ([2.68])
AC_INIT([tste], [1.0], [ee#b.com])
AM_INIT_AUTOMAKE
AC_CONFIG_SRCDIR([src/testcpp.cpp])
AC_PROG_CXX
AC_PROG_CC
AC_CONFIG_FILES([Makefile])
AC_OUTPUT
Then run:
aclocal && autoconf && automake
./configure
make
Here are some good links:
A tutorial for porting to autoconf & automake
Using Automake and Autoconf with C++
autotut: Using GNU auto{conf,make,header}