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POUndefined references when linking assembly and C++ using g++
 

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  1. POUndefined references when linking assembly and C++ using g++
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    <p>I have to write some member functions of a class in Assembly for an exam. I've followed every instruction but I still can't get it to work. Here are the relevant files. The header and the main method are already provided, I just need to write the constructor and the <code>elab1</code> method.</p> <p><strong>Class header</strong></p> <pre><code>#include &lt;iostream&gt; using namespace std; struct st { int a; int vv1[4]; double vv2[4]; }; class cl { double b; st s; public: cl(int *p, double *d); void elab1(st ss); void stampa() { int i; cout &lt;&lt; b &lt;&lt; ' ' &lt;&lt; s.a &lt;&lt; endl; for (i=0;i&lt;4;i++) cout &lt;&lt; s.vv1[i] &lt;&lt; ' '; cout &lt;&lt; '\t'; for (i=0;i&lt;4;i++) cout &lt;&lt; s.vv2[i] &lt;&lt; ' '; cout &lt;&lt; endl; cout &lt;&lt; endl; } }; </code></pre> <p><strong>Main method for testing</strong></p> <pre><code>// prova1.cpp #include "cc.h" // class header int main() { st s = {1, 1,2,3,4, 1,2,3,4 }; int v[4] = {10,11,12,13 }; double d[4] = { 2, 3, 4, 5 }; cl cc1(v, d); cc1.stampa(); cc1.elab1(s); cc1.stampa(); } </code></pre> <p>And this is my <strong>assembly</strong>:</p> <pre><code># es1.s .text .global __ZN2clC1EPiPe __ZN2clC1EPiPe: pushl %ebp movl %esp, %ebp subl $4, %esp pushl %eax pushl %ebx pushl %ecx pushl %edx pushl %esi cmpl $0, 12(%ebp) je fine cmpl $0, 16(%ebp) je fine movl 8(%ebp), %eax movl 12(%ebp), %ebx movl 4(%ebx), %ecx movl %ecx, 12(%eax) fldz fstpl (%eax) movl $0, -4(%ebp) ciclo: cmpl $4, -4(%ebp) je fine movl -4(%ebp), %esi movl 12(%ebp), %ebx movl (%ebx, %esi, 4), %ecx subl %esi, %ecx movl %ecx, 16(%eax, %esi, 4) movl 16(%ebp), %ebx pushl %eax movl %esi, %eax movl $3, %ecx imull %ecx movl %eax, %edx popl %eax movl 12(%ebp), %ecx fldl (%ebx, %edx, 4) fldl (%ecx, %esi, 4) faddp %st, %st(1) fstpl 32(%eax, %edx, 4) fldl (%ebx, %edx, 4) fldl (%eax) faddp %st, %st(1) fstpl (%eax) incl -4(%ebp) jmp ciclo fine: popl %esi popl %edx popl %ecx popl %ebx popl %eax movl 8(%ebp), %eax leave ret .global __ZN2cl5elab1E2st __ZN2cl5elab1E2st: #TODO </code></pre> <p>I try to compile and link everything with the command-line statement that has been provided to us:</p> <pre><code>g++ -o es1 -fno-elide-constructors es1.s prova1.cpp </code></pre> <p>but it only gives me a bunch of <code>undefined reference</code>s:</p> <pre><code>/tmp/ccbwS0uN.o: In function `main': prova1.cpp:(.text+0xee): undefined reference to `cl::cl(int*, double*)' prova1.cpp:(.text+0x192): undefined reference to `cl::elab1(st)' collect2: ld returned 1 exit status </code></pre> <p>Do you have any idea how can I solve this issue? I thought that probably I might have translated the function names in the wrong way, but I've checked them several times.</p>
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    1. USJens Björnhager
    1. USPietro Lorefice
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    1. COAre you sure that is two underscores in the name mangling, and not only one?
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      1. USPlasmaHH
    2. CO@PlasmaHH I've just tried to remove one underscore, and the problem is still there.
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      1. USPietro Lorefice
    3. COHow did you create the mangled names?
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      1. POUndefined references when linking assembly and C++ using g++
      1. USJohan Lundberg
 

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