Allow objcopy's --set-section-flags options to add or remove the SHF_EXCLUDE flag of ELF sections.

* objcopy.c (parse_flags): Handle "exclude".
	* doc/binutils.texi: Document the support.

binutils/ChangeLog

@@ -1,3 +1,8 @@
+2020-02-10  Fangrui Song   <maskray@google.com>
+
+	* objcopy.c (parse_flags): Handle "exclude".
+	* doc/binutils.texi: Document the support.
+
 2020-02-10  Aaron Merey  <amerey@redhat.com>
 
 	* binutils/testsuite/binutils-all/debuginfod.exp:

binutils/doc/binutils.texi

@@ -1644,10 +1644,10 @@ Set the flags for any sections matching @var{sectionpattern}.  The
 @var{flags} argument is a comma separated string of flag names.  The
 recognized names are @samp{alloc}, @samp{contents}, @samp{load},
 @samp{noload}, @samp{readonly}, @samp{code}, @samp{data}, @samp{rom},
-@samp{share}, and @samp{debug}.  You can set the @samp{contents} flag
-for a section which does not have contents, but it is not meaningful
-to clear the @samp{contents} flag of a section which does have
-contents--just remove the section instead.  Not all flags are
+@samp{exclude}, @samp{share}, and @samp{debug}.  You can set the
+@samp{contents} flag for a section which does not have contents, but it
+is not meaningful to clear the @samp{contents} flag of a section which
+does have contents--just remove the section instead.  Not all flags are
 meaningful for all object file formats.
 
 @item --set-section-alignment @var{sectionpattern}=@var{align}

binutils/objcopy.c

@@ -780,6 +780,7 @@ parse_flags (const char *s)
       PARSE_FLAG ("code", SEC_CODE);
       PARSE_FLAG ("data", SEC_DATA);
       PARSE_FLAG ("rom", SEC_ROM);
+      PARSE_FLAG ("exclude", SEC_EXCLUDE);
       PARSE_FLAG ("share", SEC_COFF_SHARED);
       PARSE_FLAG ("contents", SEC_HAS_CONTENTS);
       PARSE_FLAG ("merge", SEC_MERGE);
@@ -794,7 +795,7 @@ parse_flags (const char *s)
 	  copy[len] = '\0';
 	  non_fatal (_("unrecognized section flag `%s'"), copy);
 	  fatal (_("supported flags: %s"),
-		 "alloc, load, noload, readonly, debug, code, data, rom, share, contents, merge, strings");
+		 "alloc, load, noload, readonly, debug, code, data, rom, exclude, share, contents, merge, strings");
 	}
 
       s = snext;