use extern C so that the compiler considers C bindings

releng/codesamples/sample1.cpp

@@ -7,15 +7,20 @@
 
 #include <iostream>
 #include <inttypes.h>
+
+extern "C" {
 #include "xorriso/xorriso.h"
+}
 
 int main() {
+   int major=-1, minor=-1, micro=-1;
+   Xorriso__version(&major, &minor, &micro);
+   if (major<0 || minor<0 || micro<0)
+          return -1;
    std::cout 
-     << " major:" << Xorriso_header_version_majoR
-     << " minor:" << Xorriso_header_version_minoR
-     << " micro:" << Xorriso_header_version_micrO
+               << " major:" << major
+               << " minor:" << minor
+               << " micro:" << micro
    ;
-//     << std::endl;
-
    return 0;
 }

releng/codesamples/sample2.cpp

@@ -7,14 +7,16 @@
 
 #include <iostream>
 #include <inttypes.h>
+
+extern "C" {
 #include <libburn/libburn.h>
 #include <libisofs/libisofs.h>
 // using namespace burn;
 // (this was needed to before rev.4062 of libisoburn)
 #include <libisoburn/libisoburn.h>
+}
 
 int main() {
-/*
    int major=-1, minor=-1, micro=-1;
    isoburn_version(&major, &minor, &micro);
    if (major<0 || minor<0 || micro<0)
@@ -24,13 +26,5 @@ int main() {
           << " minor:" << minor
           << " micro:" << micro
    ;
-*/
-   std::cout 
-          << " major:" << isoburn_libisofs_req_major // major
-          << " minor:" << isoburn_libisofs_req_minor // minor
-          << " micro:" << isoburn_libisofs_req_micro // micro
-   ;
-   //     << std::endl;
-
    return 0;
 }