C++ linker presentation

cpplinker/02_symbol_resolution/build.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+set -e
+
+echo "=== Compile to object files ==="
+g++ -std=c++17 -c math.cpp -o math.o
+g++ -std=c++17 -c main.cpp -o main.o
+
+echo ""
+echo "=== math.o: exported symbols (demangled) ==="
+nm -C -g math.o
+
+echo ""
+echo "=== main.o: unresolved (UNDEF) symbols ==="
+nm -C -u main.o
+
+echo ""
+echo "=== main.o: full symbol table ==="
+objdump -t main.o
+
+echo ""
+echo "=== Link and run ==="
+g++ math.o main.o -o app
+./app

cpplinker/02_symbol_resolution/main.cpp

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+#include <iostream>
+
+double square(double);
+
+int main() {
+    double r = square(5.0);
+    std::cout << "square(5.0) = " << r << "\n";
+    return 0;
+}

cpplinker/02_symbol_resolution/math.cpp

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+#include <iostream>
+
+double square(double x) { return x * x; }