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POC++ simple files compilation using "gcc" compiler
 

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  1. POC++ simple files compilation using "gcc" compiler
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    <p>I'm trying to compile a very simple c++ code and get a linking error depending on sequence of gcc parameters. Could anybody explains what is the difference between these two command line rows?</p> <p>// This works fine</p> <pre><code>gcc -x c++ -c *.h *.cpp (first I pass *.h files then *.cpp) gcc -lstdc++ *.o -o exe </code></pre> <p>// This gives an error</p> <pre><code>gcc -x c++ -c *.cpp *.h (first I pass *.cpp files then *.h) gcc -lstdc++ *.o -o exe </code></pre> <p>Does gcc care of the parameters sequence? </p> <p>Examples:</p> <p>// THIS CASE WORKS FINE</p> <pre> [karen@linux40 ~/C++]$ ls Employee.cpp Employee.h Main.cpp [karen@linux40 ~/C++]$ gcc -x c++ -c *.h *.cpp [karen@linux40 ~/C++]$ ls Employee.cpp Employee.h Employee.o Main.cpp Main.o Makefile [karen@linux40 ~/C++]$ gcc -lstdc++ *.o -o exe [karen@linux40 ~/C++]$ ls exe Employee.cpp Employee.h Employee.o Main.cpp Main.o </pre> <p>// THIS IS THE PROBLEMATIC CASE</p> <pre> [karen@linux40 ~/C++]$ ls Employee.cpp Employee.h Main.cpp [karen@linux40 ~/C++]$ gcc -x c++ -c *.cpp *.h [karen@linux40 ~/C++]$ ls Employee.cpp Employee.h Employee.o Main.cpp Main.o [karen@linux40 ~/C++]$ gcc -lstdc++ *.o -o exe Main.o: In function `main': Main.cpp:(.text+0x8d): undefined reference to `Employee::Employee()' collect2: ld returned 1 exit status </pre> <p>Employee.h</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; using namespace std; class Employee { public: Employee(); Employee(string theName, float thePayRate); string getName() const; float getPayRate() const; float pay(float hoursWorked) const; protected: string name; float payRate; }; </code></pre> <p>Employee.cpp</p> <pre><code>#include "Employee.h" Employee::Employee() { } Employee::Employee(string theName, float thePayRate) { name = theName; payRate = thePayRate; } string Employee::getName() const { return name; } float Employee::getPayRate() const { return payRate; } float Employee::pay(float hoursWorked) const { return hoursWorked * payRate; } </code></pre> <p>Main.cpp</p> <pre><code>#include "Employee.h" int main() { Employee e; return 0; } </code></pre>
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    1. USKaren Margaryan
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    1. COYou should not pass .h files to gcc.
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      1. USDark Falcon
    2. COWhat's the 'error'? Also, what's in your `*.h` files that they have to be fed to the compiler explicitly?
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      1. USMichael Burr
    3. COAnd yes it does care about the order of the linked libraries, even though this is not related to your error exactly, but sort of related to your question
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      1. USlearnvst
 

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