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POError in compiling C code with variable name new with g++
 

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  1. POError in compiling C code with variable name new with g++
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    <p>We are trying a modify some existing C projects i.e. we are trying to make some C++ function calls from the C code. We tried changing compiler from gcc to g++ but there were several compilation errors because of incompatibality. What we are trying to do is to call some C++ functions in C code without making any change to existing code. Simply changing the compiler didn't seem to do the trick. Hence we tried following:</p> <pre><code>#include &lt;stdio.h&gt; extern "C" { int func(int new ) { printf("in new func()\n"); } } </code></pre> <p>When i compile it using command</p> <blockquote> <p>g++ -c hello.c -o hello </p> </blockquote> <p>we get following errors </p> <pre><code>hello.c:9: error:expected ‘,’ or ‘...’ before ‘new’. </code></pre> <p>Now we are aware that new is c++ keyword. As mentioned before, we are trying not to make any modifications to existing C code. Any suggestions ?</p> <p>These aren't the only errors. There are other errors related to structure declaration.</p> <blockquote> <p>attr.c:75: error: expected primary-expression before ‘.’ token</p> </blockquote> <p>At attr.c, line 75 is</p> <blockquote> <p>static post_op_attr error_attr = {.attributes_follow = FALSE }; </p> </blockquote> <p>The problem is that there are other C styled structure declaration and initialization done in the code so even if we rename the variable name, we would still have to modify other parts of the C program. Hence we are looking for a way to add C++ function calls to C code without modifying existing C code. </p>
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    1. COIf you don't want to make any modifications to the C code, why not carry on compiling it as C? From C++ you just need `extern "C"` declarations of the functions that you need to call.
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    2. COTo clarify Charles' point, note that in the declaration within your `C++` program, you don't need to give the argument a name.
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    3. CO@BoBTFish Nor is it necessary in C.
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