Makefile Mix for C and C++ Post: 302703905

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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

09-20-2012

Registered User

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

hfbrando

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LEARN ABOUT DEBIAN

ml-makedepend

ml-makedepend(1)					      General Commands Manual						  ml-makedepend(1)

NAME

       ml-makedepend - list files a ML program depends upon

SYNOPSIS

       ml-makedepend [ DU-options ] [ -n ] [ -f makefile ]  project.cm target
       ml-makedepend [ DU-options ] [ -a arch ] [ -o os  ] [ -f makefile ] project.cm target

DESCRIPTION

       This  manual page documents briefly the ml-makedepend command.  This manual page was written for the Debian distribution because the origi-
       nal program does not have a manual page.  The ml-makedepend script is part of the SML/NJ CM (Compilation and Library Manager) that is  used
       to generate a list of files that a ML program depends on for use by make.

OPTIONS

       A summary of options is included below.

       -n     ml-makedepend  usually  uses  the  make variables $(ARCH) and $(OPSYS) in the filenames for the Makefile.  This option disables this
	      feature.

       -a arch
	      Use arch in place of $(ARCH).

       -o os  Use os in place of $(OPSYS).

       -f makefile
	      Name of the makefile to be used rather than the default Makefile.

       -Dname=value
	      Set CM variable to given value.

       -Dname Set CM variable to 1.

       -Uname Unset CM variable.

SEE ALSO

       sml(1), ml-lex(1), ml-build(1), ml-yacc(1).
       The programs are documented fully by CM: The SML/NJ Compilation and Library Manager, User Manual, Matthias Blume, which	is  available  via
       <http://cm.bell-labs.com/cm/cs/what/smlnj/doc/CM/new.pdf>.

AUTHOR

       This manual page was written by Aaron Matthew Read <amread@nyx.net>, for the Debian GNU/Linux system (but may be used by others).

								 October 25, 2002						  ml-makedepend(1)