objcopy: Don't add zstd to the debug compression options if not available

If zstd is not available or was intentionally disabled by the user
don't add it to the list of the available options to compress debug
sections when showing usage.

binutils/
	* objcopy.c (copy_usage): Only output
	--compress-debug-sections=zstd if HAVE_ZSTD.

diff --git a/binutils/objcopy.c b/binutils/objcopy.c
index 3c1bcf622ff2c813276109c626bfb7711c5ccc77..9373b75d6ed5c32a440f76768adbffb8ccb14e7b 100644 (file)
--- a/binutils/objcopy.c
+++ b/binutils/objcopy.c
@@ -570,6 +570,12 @@ static bool write_debugging_info (bfd *, void *, long *, asymbol ***);
 static const char *lookup_sym_redefinition (const char *);
 static const char *find_section_rename (const char *, flagword *);
 \f
+#ifdef HAVE_ZSTD
+#define ZSTD_OPT "|zstd"
+#else
+#define ZSTD_OPT ""
+#endif
+
 ATTRIBUTE_NORETURN static void
 copy_usage (FILE *stream, int exit_status)
 {
@@ -692,8 +698,8 @@ copy_usage (FILE *stream, int exit_status)
                                    <commit>\n\
      --subsystem <name>[:<version>]\n\
                                    Set PE subsystem to <name> [& <version>]\n\
-     --compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi|zstd}]\n\
-                                  Compress DWARF debug sections\n\
+     --compress-debug-sections[={none|zlib|zlib-gnu|zlib-gabi" ZSTD_OPT "}]\n\
+                                   Compress DWARF debug sections\n\
      --decompress-debug-sections   Decompress DWARF debug sections using zlib\n\
      --elf-stt-common=[yes|no]     Generate ELF common symbols with STT_COMMON\n\
                                      type\n\