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POIs the const value parameter in definition but not declaration really C++?
 

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  1. POIs the const value parameter in definition but not declaration really C++?
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    <p>This is similar to (but different from) <a href="https://stackoverflow.com/questions/117293/use-of-const-for-function-parameters" title="tangent from this question">this question</a>.</p> <p>Here is some simple test code to illustrate some weirdness I have discovered with Sun CC:</p> <pre><code>//---------------main.cpp #include "wtc.hpp" int main(int, char**) { testy t; t.lame(99); return 0; } //--------------wtc.hpp #ifndef WTC_HPP_INCLUDED #define WTC_HPP_INCLUDED class testy { public: void lame(int ); }; #endif //---------------wtc.cpp #include &lt;iostream&gt; #include "wtc.hpp" void testy::lame(const int a) { std::cout &lt;&lt; "I was passed " &lt;&lt; a &lt;&lt; "\n"; } //---------------makefile #CXX=CC CXX =g++ #CXXFLAGS= -g CXXFLAGS= -g3 -Wall -Werror OBJECTS=$(patsubst %.cpp,%.o,$(wildcard *.cpp)) all : $(OBJECTS) $(CXX) $(CXXFLAGS) -o $@ $^ .PHONY: clean clean : rm *.o </code></pre> <p>When this was compiled using g++ it compiles, links and does what you would expect when run. You can also add a ++a; in testy::lame() and the compiler will complain about changing a read-only variable (as it should).</p> <p>However when I compile using CC, I get the following linker error:</p> <pre><code>CC -g -c -o main.o main.cpp CC -g -c -o wtc.o wtc.cpp CC -g -o all main.o wtc.o Undefined first referenced symbol in file void testy::lame(int) main.o ld: fatal: Symbol referencing errors. No output written to all make: *** [all] Error 1 </code></pre> <p>checking the object code with nm and C++filt, I find that the g++ version creates a testy::lame(int) symbol, whereas CC creates testy::lame(const int) , hence the linker error.</p> <p>I looked it up in Stroustrup's book, but can't find this technique mentioned (doesn't mean it's not there!); so is this really a compiler bug, or just a hack that works everywhere else but Solaris? </p>
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    1. USChris Huang-Leaver
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    1. COHave you sent a bug report to Oracle?
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