[PATCH 2/2] specs: always generate built-in specs, before reading "specs" file

[Dimitri John Ledkov]

Previously either "specs" file was read, or built-in specs were
generated.

With this change, always load generated "built-in" specs, prior to
discovering and loading optional "specs" file.

Also relax, and allow using "%include", "%include_noerr", and
"%rename" commands in the "specs" file.

Then continue to load user specified `-specs` files on the command
line.

This makes "specs" file from startfiles locations, behave closer to
user provided "-specs" files.

gcc/ChangeLog:

        * gcc.cc (driver::set_up_specs): Always load "built-in"
        generated specs files, prior to loading "specs" file. Allow
        "%include", "%include_noerr" and "%rename" commands in
        "specs" file.

Signed-off-by: Dimitri John Ledkov <dimitri.led...@surgut.co.uk>
---
 gcc/gcc.cc | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/gcc/gcc.cc b/gcc/gcc.cc
index b00d93b45c4..8d208e7de00 100644
--- a/gcc/gcc.cc
+++ b/gcc/gcc.cc
@@ -8464,12 +8464,18 @@ driver::set_up_specs () const
                           accel_dir_suffix, dir_separator_str, NULL);
   just_machine_suffix = concat (spec_machine, dir_separator_str, NULL);
 
+  /* Always init built-in specs, as all followups can then
+     append/remove/rename. This also makes the existing Spec documentation true
+     for both command-line -specs provided files, and those added to the
+     <startfiles>/specs location */
+  init_spec ();
+
   specs_file = find_a_file (&startfile_prefixes, "specs", R_OK, true);
-  /* Read the specs file unless it is a default one.  */
-  if (specs_file != 0 && strcmp (specs_file, "specs"))
-    read_specs (specs_file, true, false);
-  else
-    init_spec ();
+
+  /* Read the specs file, these days empty, thus allow #include_noerr
+     commands */
+  if (specs_file != 0)
+    read_specs (specs_file, false, false);
 
 #ifdef ACCEL_COMPILER
   spec_machine_suffix = machine_suffix;
@@ -8485,7 +8491,7 @@ driver::set_up_specs () const
   strcat (specs_file, spec_machine_suffix);
   strcat (specs_file, "specs");
   if (access (specs_file, R_OK) == 0)
-    read_specs (specs_file, true, false);
+    read_specs (specs_file, false, false);
 
   /* Process any configure-time defaults specified for the command line
      options, via OPTION_DEFAULT_SPECS.  */
-- 
2.43.0