x2

dlopen-autotools/Makefile.am

@@ -0,0 +1,14 @@
+lib_LTLIBRARIES = libmyfu1.la
+libmyfu1_la_SOURCES = myfu1.c
+libmyfu1_la_CFLAGS = -fPIC
+libmyfu1_la_LDFLAGS = -version-info 1:0:0 -rpath /usr/local/lib
+lib_LTLIBRARIES += libmyfu2.la
+libmyfu2_la_SOURCES = myfu2.c
+libmyfu2_la_CFLAGS = -fPIC
+libmyfu2_la_LDFLAGS = -version-info 1:0:0 -rpath /usr/local/lib
+
+main_LDADD = libmyfu1.la libmyfu2.la -ldl
+bin_PROGRAMS = main
+main_SOURCES = main.c
+main_LDADD += libmyfu1.la
+main_LDADD +=  libmyfu2.la

dlopen-autotools/configure.ac

@@ -0,0 +1,6 @@
+AC_INIT([MyLib], [1.0], [[email protected]])
+AM_INIT_AUTOMAKE
+AC_PROG_CC
+LT_INIT
+AC_CONFIG_FILES([Makefile])
+AC_OUTPUT

dlopen-autotools/main.c

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <dlfcn.h>
+
+void myfu() {
+    printf("Hello from main myfu!\n");
+}
+
+
+int main() {
+    void *handle;
+    handle = dlopen("libmyfu2.so", RTLD_NOW);
+    myfu();
+    void (*myfu)() = (void (*)()) dlsym(handle, "myfu");
+    char *error = dlerror();
+    if (error) {
+        fprintf(stderr, "Error finding symbol 'myfu': %s\n", error);
+        dlclose(handle);
+        return 1;
+    }
+    printf("Calling myfu:\n");
+    myfu();
+    return 0;
+}

dlopen-autotools/myfu.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+// Define the external function
+void myfu() {
+    printf("Hello from so myfu!\n");
+}

dlopen-autotools/myfu1.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+// Define the external function
+void myfu() {
+    printf("Hello from so1 myfu!\n");
+}

dlopen-autotools/myfu2.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+
+// Define the external function
+void myfu() {
+    printf("Hello from so2 myfu!\n");
+}

dlopen-autotools/run.sh

@@ -0,0 +1,6 @@
+ aclocal
+ autoconf
+ automake --add-missing
+ ./configure --disable-dependency-tracking
+ gmake -j
+ ./main