C++ linker presentation

cpplinker/03_name_mangling/build.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -e
+
+echo "=== Compile to object file ==="
+g++ -std=c++17 -c mangling.cpp -o mangling.o
+
+echo ""
+echo "=== Raw mangled symbols ==="
+nm -g mangling.o | grep -E "process|sqrt|dot|legacy"
+
+echo ""
+echo "=== Demangled symbols ==="
+nm -C -g mangling.o | grep -E "process|sqrt|dot|legacy"
+
+echo ""
+echo "=== Demangle individual symbols ==="
+echo "_Z7processi"  | c++filt
+echo "_Z7processd"  | c++filt
+echo "_Z7processid" | c++filt
+echo "_ZN4Math4sqrtEd" | c++filt
+echo "_ZN6Vector3dotERKS_" | c++filt
+echo "legacy_init"  | c++filt
+
+echo ""
+echo "=== Build and run ==="
+g++ -std=c++17 mangling.o -o app
+./app

cpplinker/03_name_mangling/mangling.cpp

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+#include <iostream>
+
+int process(int x) { return x * 2; }
+int process(double x) { return (int)(x * 2); }
+int process(int x, double y) { return x + (int)y; }
+
+namespace Math {
+    double sqrt(double x) { return x * 0.5; }
+}
+
+class Vector {
+public:
+    double x, y;
+    double dot(const Vector& v) { return x * v.x + y * v.y; }
+};
+
+extern "C" {
+    int legacy_init(void) { return 0; }
+    void legacy_free(void* p) { (void)p; }
+}
+
+int main() {
+    std::cout << "process(3)      = " << process(3) << "\n";
+    std::cout << "process(3.0)    = " << process(3.0) << "\n";
+    std::cout << "process(3, 4.0) = " << process(3, 4.0) << "\n";
+    std::cout << "Math::sqrt(9)   = " << Math::sqrt(9.0) << "\n";
+
+    Vector a{1, 2}, b{3, 4};
+    std::cout << "a.dot(b)        = " << a.dot(b) << "\n";
+
+    std::cout << "legacy_init()   = " << legacy_init() << "\n";
+    return 0;
+}