I am new to autotools and have tried to code up an example. I am creating one library and linking it against another object.
My problem is that the Makefile that is generated for the library seems to be mis-interpreted as C code, but is actually C++. If I replace all occurences of ".c" to ".cpp" in the generated Makefile, all is well.
I am using libtool 2.4.2 and autoconf 2.69. My code structure is listed below:
test/
- Makefile.am
- configure.ac
include/
- mylib.hh
src/
hw/
- Makefile.am
- main.cpp
mylib/
- Makefile.am
- mylib.cpp
Below is my top level Makefile.am:
ACLOCAL_AMFLAGS = -I m4
SUBDIRS = src/mylib src/hw
configure.ac
AC_PREREQ([2.65])
AC_INIT([hw],[1.0.0],[[email protected]])
# directories (relative to top-level) to look into for AutoConf/AutoMake files
AC_CONFIG_MACRO_DIR([m4])
# enable AutoMake
AM_INIT_AUTOMAKE([1.10])
# all defined C macros (HAVE_*) will be saved to this file
AC_CONFIG_HEADERS([config.h])
AC_PROG_CC
AM_PROG_CC_C_O
# Check if you have a C++ compiler
AC_PROG_CXX
AC_PROG_CXX_C_O
AC_PROG_INSTALL
## Initialize GNU LibTool
LT_INIT
AC_CONFIG_FILES([Makefile
src/hw/Makefile
src/mylib/Makefile])
AC_OUTPUT
src/hw/Makefile.am
ACLOCAL_AMFLAGS = -I m4
bin_PROGRAMS = hw
hw_SOURCES = main.cpp
AM_CPPFLAGS = -I$(top_srcdir)/include
hw_LDADD = $(top_srcdir)/src/mylib/libmylib.la
src/mylib/Makefile.am
ACLOCAL_AMFLAGS = -I m4
lib_LTLIBRARIES = libmylib.la
libmylib_la_sources = mylib.cpp
libmylib_la_CPPFLAGS = -I$(top_srcdir)/include
The error I get when running make:
make[2]: *** No rule to make target 'libmylib.c', needed by 'libmylib_la-libmylib.lo'. Stop.
Once again, substituting ".cpp" for all occurrences of ".c" in the generated src/mylib/Makefile, the code compiles, links and runs fine. Any help is appreciated.
