static/shared_lib example added

c/shared_lib/build.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+CC=cc
+LIBNAME=mean
+LIBREV=1
+LIBVER=1.0.0
+TEST=main
+rm *.out *.o *.a *.0 *.1 ${TEST}_* *.so &>/dev/null
+# --- dynamic ---
+$CC -c -fPIC $LIBNAME.c -o $LIBNAME.o
+$CC -shared -Wl,-soname,lib${LIBNAME}.so.${LIBREV} -o lib${LIBNAME}.so.$LIBVER $LIBNAME.o
+ldconfig -n .
+ln -s lib${LIBNAME}.so.${LIBREV} lib${LIBNAME}.so
+$CC $TEST.c -L. -l${LIBNAME} -o ${TEST}_dynamic
+# --- static ---
+ar rcs lib${LIBNAME}.a $LIBNAME.o
+$CC $TEST.c -static -L. -l${LIBNAME} -o ${TEST}_static
+
+# --- run dynamic ---
+LD_LIBRARY_PATH=. ./main_dynamic

c/shared_lib/main.c

@@ -0,0 +1,15 @@
+#include <stdio.h>
+#include "mean.h"
+
+int main(int argc, char* argv[]) {
+
+  double v1, v2, m;
+  v1 = 5.2;
+  v2 = 7.9;
+
+  m  = mean(v1, v2);
+
+  printf("The mean of %3.2f and %3.2f is %3.2f\n", v1, v2, m);
+
+  return 0;
+}

c/shared_lib/mean.c

@@ -0,0 +1,5 @@
+//#include <stdio.h>
+
+double mean(double a, double b) {
+  return (a+b) / 2;
+}

c/shared_lib/mean.h

@@ -0,0 +1 @@
+double mean(double, double);