Place MODULAR_GC_DIR under exec_prefix unless starting with a slash

Author: nobu

gc.c

@@ -706,6 +706,10 @@ typedef struct gc_function_map {
 
 static rb_gc_function_map_t rb_gc_functions;
 
+#if !defined(LOAD_RELATIVE)
+#include "verconf.h"
+#endif
+
 # define RUBY_GC_LIBRARY "RUBY_GC_LIBRARY"
 # define MODULAR_GC_DIR STRINGIZE(modular_gc_dir)
 
@@ -737,7 +741,7 @@ ruby_modular_gc_init(void)
             }
         }
 
-        size_t gc_so_path_size = strlen(MODULAR_GC_DIR "librubygc." DLEXT) + strlen(gc_so_file) + 1;
+        size_t gc_so_path_size = rb_strlen_lit(MODULAR_GC_DIR "librubygc." DLEXT) + strlen(gc_so_file) + 1;
 #ifdef LOAD_RELATIVE
         Dl_info dli;
         size_t prefix_len = 0;
@@ -757,6 +761,8 @@ ruby_modular_gc_init(void)
                 gc_so_path_size += prefix_len;
             }
         }
+#else
+        if (MODULAR_GC_DIR[0] != '/') gc_so_path_size += rb_strlen_lit(RUBY_EXEC_PREFIX);
 #endif
         gc_so_path = alloca(gc_so_path_size);
         {
@@ -769,6 +775,8 @@ ruby_modular_gc_init(void)
                 memcpy(gc_so_path, dli.dli_fname, prefix_len);
                 gc_so_path_idx = prefix_len;
             }
+#else
+            if (MODULAR_GC_DIR[0] != '/') GC_SO_PATH_APPEND(RUBY_EXEC_PREFIX);
 #endif
             GC_SO_PATH_APPEND(MODULAR_GC_DIR "librubygc.");
             GC_SO_PATH_APPEND(gc_so_file);