Fix build when missing -lz and -lbz2.

1 files changed, 15 insertions, 8 deletions

diff --git a/libdwfl/open.c b/libdwfl/open.c
index ca6b862f..611295f2 100644
--- a/libdwfl/open.c
+++ b/libdwfl/open.c
@@ -64,14 +64,13 @@
 /* Always consumes *ELF, never consumes FD.
    Replaces *ELF on success.  */
 static Dwfl_Error
-decompress (int fd, Elf **elf)
+decompress (int fd __attribute__ ((unused)), Elf **elf)
 {
   Dwfl_Error error = DWFL_E_BADELF;
+  void *buffer = NULL;
+  size_t size = 0;
 
 #if USE_ZLIB || USE_BZLIB
-  void *buffer;
-  size_t size;
-
   const off64_t offset = (*elf)->start_offset;
   void *const mapped = ((*elf)->map_address == NULL ? NULL
 			: (*elf)->map_address + (*elf)->start_offset);
@@ -87,14 +86,22 @@ decompress (int fd, Elf **elf)
 
   if (error == DWFL_E_NOERROR)
     {
-      *elf = elf_memory (buffer, size);
-      if (*elf == NULL)
+      if (unlikely (size == 0))
 	{
-	  error = DWFL_E_LIBELF;
+	  error = DWFL_E_BADELF;
 	  free (buffer);
 	}
       else
-	(*elf)->flags |= ELF_F_MALLOCED;
+	{
+	  *elf = elf_memory (buffer, size);
+	  if (*elf == NULL)
+	    {
+	      error = DWFL_E_LIBELF;
+	      free (buffer);
+	    }
+	  else
+	    (*elf)->flags |= ELF_F_MALLOCED;
+	}
     }
 
   return error;