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Full Discussion: Makefile Mix for C and C++
Top Forums Shell Programming and Scripting Makefile Mix for C and C++ Post 302703905 by hfbrando on Thursday 20th of September 2012 02:05:24 PM
Old 09-20-2012
Thank you DGPickett for your answer.
I've been looking for the use of extern in ANSI C, and I tried several ways to code it:
Code:
extern "C++" {
      #include <opencv2/features2d/features2d.hpp>
}

But it didn't work (the compiler threw errors because of the quotation marks or the braces... I changed them by parenthesis and simple quotation marks, but It didn't work. After I found a post (*) that say that C does not define linkage to any other language (but C++ does).
So I tried with extern "C" in the c++ library, but when I compiled it threw the same compilation error...

ardrone_testing_tool.c: (.text+0x1212) : undefined reference to `cvSURFParams'
ardrone_testing_tool.c: (.text+0x126f) : undefined reference to `cvExtractSURF'


In that link, they say also that I could try with the compiler g++ (I should fix the errors I put in the last post).
What do you think about that?

Concerning the compiler, you mean to take out '.cpp' in INTERNAL_SOURCE_EXTENSIONS, and after put the .hpp file in a separated folder and call the g++ just for that folder and generate the .o ?
How can I put all the .o files all together ?

Is it OK what I'm saying? Sorry if I'm saying something that is wrong, I started just some days ago with the GNU makefile.

Thanks a lot.

(*) The forum does not allow to put links before 5 posts. Write on google "linking a C++ library to a C program" bytes
 

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PYTHON-CONFIG(1)					      General Commands Manual						  PYTHON-CONFIG(1)

NAME
python-config - output build options for python C/C++ extensions or embedding SYNOPSIS
python-config [ --prefix ] [ --exec-prefix ] [ --includes ] [ --libs ] [ --cflags ] [ --ldflags ] [ --help ] DESCRIPTION
python-config helps compiling and linking programs, which embed the Python interpreter, or extension modules that can be loaded dynamically (at run time) into the interpreter. OPTIONS
--cflags print the C compiler flags. --ldflags print the flags that should be passed to the linker. --includes similar to --cflags but only with -I options (path to python header files). --libs similar to --ldflags but only with -l options (used libraries). --prefix prints the prefix (base directory) under which python can be found. --exec-prefix print the prefix used for executable program directories (such as bin, sbin, etc). --help print the usage message. EXAMPLES
To build the singe-file c program prog against the python library, use gcc $(python-config --cflags --ldflags) progr.cpp -o progr.cpp The same in a makefile: CFLAGS+=$(shell python-config --cflags) LDFLAGS+=$(shell python-config --ldflags) all: progr To build a dynamically loadable python module, use gcc $(python-config --cflags --ldflags) -shared -fPIC progr.cpp -o progr.so SEE ALSO
python (1) http://docs.python.org/extending/extending.html /usr/share/doc/python/faq/extending.html AUTHORS
This manual page was written by Johann Felix Soden <johfel@gmx.de> for the Debian project (and may be used by others). November 27, 2011 PYTHON-CONFIG(1)
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