Add early_flags to default_target_compile

This adds early_flags support to default_target_compile.  This
originated in this gdb patch:

    commit 6ebea266fd0a7a56c90db3ab6237ff9f6c919747
    Author: Doug Evans <dje@google.com>
    Date:   Fri Jul 24 15:24:37 2015 -0700

	Workaround debian change to default value of --as-needed.

	gdb/testsuite/ChangeLog:

		* lib/future.exp (gdb_default_target_compile): New option
		"early_flags".
		* lib/gdb.exp (gdb_compile): Undo debian's change in default of
		--as-needed.

This patch also pulls in the "linker_opts_order" code, though nothing
uses it yet.  A use will come in a subsequent patch.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 69a80ef..216b4ec 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2020-06-19  Tom Tromey  <tromey@adacore.com>
+
+	* lib/target.exp (default_target_compile): Add early_flags.
+	* doc/dejagnu.texi (target_compile procedure): Document
+	early_flags.
+
 2020-06-02  Jacob Bachmeyer  <jcb62281+dev@gmail.com>
 
 	PR 41647