From fb9960c0f51b23282e250b9e08fc12926d076c2d Mon Sep 17 00:00:00 2001
From: lloyd <lloyd@randombit.net>
Date: Mon, 17 Nov 2008 18:30:45 +0000
Subject: Use TR1 by default with GNU C++ and Intel C++, since all recent
 versions of both support TR1 fine AFAICT.

Add ability to explicitly disable using TR1 with --with-tr1=none

Add a marker in the cc info files specifiying if TR1 should be chosen
by default. Yes, autoconf would be better for this than a static
per-compiler setting. Yes, I totally hate autoconf. Yes, I would still
consider autoconf patches. No, I'm not going to do it myself. :)

I am looking forward to being able to safely adopt C++0x and TR2
throughout the library and make the need for a lot of this special-casing
stuff go away.

Until then, it seems better to defaulting to using tr1 (and thus, ECC) than
not.
---
 configure.pl | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

(limited to 'configure.pl')

diff --git a/configure.pl b/configure.pl
index 581e429fa..d18189436 100755
--- a/configure.pl
+++ b/configure.pl
@@ -224,8 +224,7 @@ sub warning {
 }
 
 sub autoconfig {
-    print with_diagnostic('autoconfig', @_)
-        if($$config{'verbose'});
+    print with_diagnostic('autoconfig', @_);
 }
 
 sub emit_help {
@@ -312,9 +311,9 @@ default, autodetection will be attempted.
 
 To change build options:
 
-  --with-tr1={boost,system}    enable using a TR1 implementation
-  --with-build-dir=DIR         setup the build in DIR
-  --with-local-config=FILE     include the contents of FILE into build.h
+  --with-tr1={none,system,boost}  enable (or disable) using a TR1 implementation
+  --with-build-dir=DIR            setup the build in DIR
+  --with-local-config=FILE        include the contents of FILE into build.h
 
   --disable-debug      don't worry about debugging
   --enable-debug       set compiler flags for debugging
@@ -391,6 +390,13 @@ sub choose_target {
 
     my %ccinfo = %{$COMPILER{$cc}};
 
+    if(defined($ccinfo{'compiler_has_tr1'})) {
+        unless(defined($$config{'tr1'})) {
+            autoconfig("Assuming compiler $cc has TR1 headers. Use --with-tr1= to disable");
+            $$config{'tr1'} = 'system';
+        }
+    }
+
     $os = os_alias($os);
     croak("OS $os isn't known (try --help)") unless
         ($os eq 'generic' or defined($OPERATING_SYSTEM{$os}));
@@ -503,6 +509,9 @@ sub can_enable_module {
 
     if($modinfo{'uses_tr1'} eq 'yes') {
         return '' unless defined($$config{'tr1'});
+
+        my $tr1 = $$config{'tr1'};
+        return '' unless($tr1 eq 'system' or $tr1 eq 'boost');
     }
 
     # @deps is the full list of modules that must be loaded (this loop
@@ -582,7 +591,7 @@ sub print_enabled_modules {
             }
         }
 
-        autoconfig("Loading from $s");
+        print with_diagnostic('loading', $s) if($$config{'verbose'});
     }
 }
 
@@ -1277,8 +1286,8 @@ sub load_modules {
             elsif($tr1 eq 'boost') {
                 push @macro_list, '#define BOTAN_USE_BOOST_TR1';
             }
-            else {
-                warning("Unknown --with-tr1= option $tr1, will ignore");
+            elsif($tr1 ne 'none') {
+                croak("Unknown --with-tr1= option value '$tr1' (try --help)");
             }
         }
 
@@ -1724,7 +1733,9 @@ sub get_cc_info {
                      'debug_flags',
                      'no_debug_flags');
 
-        match_any_of($_, \%info, 'unquoted', 'makefile_style');
+        match_any_of($_, \%info, 'unquoted',
+                     'makefile_style',
+                     'compiler_has_tr1');
 
         sub quoted_mapping {
             my $hashref = $_[0];
-- 
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