Add support for gnu debuglink

src/platform/program_name.hpp

@@ -7,6 +7,8 @@
 #if defined(_WIN32)
 #include <windows.h>
 
+#define CPPTRACE_MAX_PATH MAX_PATH
+
 namespace cpptrace {
 namespace detail {
     inline std::string program_name() {
@@ -35,6 +37,8 @@ namespace detail {
 #include <mach-o/dyld.h>
 #include <sys/syslimits.h>
 
+#define CPPTRACE_MAX_PATH PATH_MAX
+
 namespace cpptrace {
 namespace detail {
     inline const char* program_name() {
@@ -63,6 +67,8 @@ namespace detail {
 #include <sys/types.h>
 #include <unistd.h>
 
+#define CPPTRACE_MAX_PATH PATH_MAX
+
 namespace cpptrace {
 namespace detail {
     inline const char* program_name() {

src/symbols/symbols_with_libdwarf.cpp

@@ -548,11 +548,14 @@ namespace libdwarf {
             }
             #endif
 
+            // Giving libdwarf a buffer for a true output path is needed for its automatic resolution of debuglink and
+            // dSYM files. We don't utilize the dSYM logic here, we just care about debuglink.
+            std::unique_ptr<char[]> buffer(new char[CPPTRACE_MAX_PATH]);
             Dwarf_Ptr errarg = 0;
             auto ret = dwarf_init_path(
                 obj_path.c_str(),
-                nullptr,
+                buffer.get(),
-                0,
+                CPPTRACE_MAX_PATH,
                 DW_GROUPNUMBER_ANY,
                 err_handler,
                 errarg,
@@ -563,7 +566,6 @@ namespace libdwarf {
                 // fail, no debug info
             } else if(ret != DW_DLV_OK) {
                 fprintf(stderr, "Error\n");
-            } else {
             }
         }