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elf: Fix compile error with -Werror and -DNDEBUG

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Using -Werror and -DNDEBUG at the same time will trigger the
following compiler error:

cache.c: In function 'save_cache':
cache.c:758:15: error: unused variable 'old_offset' [-Werror=unused-variable]
  758 |       off64_t old_offset = lseek64 (fd, extension_offset, SEEK_SET);
      |               ^~~~~~~~~~

-DNDEBUG disables the assertion, making old_offset unused.
Use __attribute__ ((unused)) to disable this warning.
This commit is contained in:
Yang Yanchao 2022-04-15 17:25:05 +08:00 committed by Florian Weimer
parent cfdc4df66c
commit 5e89ed42fd
1 changed files with 2 additions and 1 deletions
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elf/cache.c
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@ -727,7 +727,8 @@ save_cache (const char *cache_name)
if (opt_format != opt_format_old) if (opt_format != opt_format_old)
{ {
/* Align file position to 4. */ /* Align file position to 4. */
off64_t old_offset = lseek64 (fd, extension_offset, SEEK_SET); __attribute__ ((unused)) off64_t old_offset
= lseek64 (fd, extension_offset, SEEK_SET);
assert ((unsigned long long int) (extension_offset - old_offset) < 4); assert ((unsigned long long int) (extension_offset - old_offset) < 4);
write_extensions (fd, str_offset, extension_offset); write_extensions (fd, str_offset, extension_offset);
} }