uClibc toolchains built with no dynamic library support don't provide
the dlfcn.h header. That leads to build failure:

  CC      src/tools.o
src/tools.c:15:10: fatal error: dlfcn.h: No such file or directory
 #include <dlfcn.h>
          ^~~~~~~~~
Enable dladdr only when USE_DL is defined.
---
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---
 src/tools.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/tools.c b/src/tools.c
index 1c664852ad73..0bd80f846d05 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -10,7 +10,7 @@
  *
  */
 
-#ifdef __ELF__
+#if defined(__ELF__) && defined(USE_DL)
 #define _GNU_SOURCE
 #include <dlfcn.h>
 #include <link.h>
@@ -4410,7 +4410,7 @@ const char *get_exec_path()
        return ret;
 }
 
-#ifdef __ELF__
+#if defined(__ELF__) && defined(USE_DL)
 /* calls dladdr() or dladdr1() on <addr> and <dli>. If dladdr1 is available,
  * also returns the symbol size in <size>, otherwise returns 0 there.
  */
@@ -4444,7 +4444,7 @@ static int dladdr_and_size(const void *addr, Dl_info 
*dli, size_t *size)
  * The file name (lib or executable) is limited to what lies between the last
  * '/' and the first following '.'. An optional prefix <pfx> is prepended 
before
  * the output if not null. The file is not dumped when it's the same as the one
- * that contains the "main" symbol, or when __ELF__ is not set.
+ * that contains the "main" symbol, or when __ELF__ && USE_DL are not set.
  *
  * The symbol's base address is returned, or NULL when unresolved, in order to
  * allow the caller to match it against known ones.
@@ -4472,7 +4472,7 @@ const void *resolve_sym_name(struct buffer *buf, const 
char *pfx, void *addr)
 #endif
        };
 
-#ifdef __ELF__
+#if defined(__ELF__) && defined(USE_DL)
        Dl_info dli, dli_main;
        size_t size;
        const char *fname, *p;
@@ -4489,7 +4489,7 @@ const void *resolve_sym_name(struct buffer *buf, const 
char *pfx, void *addr)
                }
        }
 
-#ifdef __ELF__
+#if defined(__ELF__) && defined(USE_DL)
        /* Now let's try to be smarter */
        if (!dladdr_and_size(addr, &dli, &size))
                goto unknown;
@@ -4529,7 +4529,7 @@ const void *resolve_sym_name(struct buffer *buf, const 
char *pfx, void *addr)
                chunk_appendf(buf, "+%#lx", (long)(addr - dli.dli_fbase));
                return NULL;
        }
-#endif /* __ELF__ */
+#endif /* __ELF__ && USE_DL */
  unknown:
        /* unresolved symbol from the main file, report relative offset to main 
*/
        if ((void*)addr < (void*)main)
-- 
2.27.0


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