From d192a3aaeb76fc89f8285b4dc938c2bc0c37d0d4 Mon Sep 17 00:00:00 2001
From: Richard Levitte <levitte@openssl.org>
Date: Sun, 5 Mar 2017 21:51:18 +0100
Subject: [PATCH] Add a platform specific configuration checker

For each platform, we may need to perform some basic checks to see
that available tools perform as we expect them.

For the moment, the added checkers test that Perl gives the expected
path format.  This should help MingW users to see if they run an
appropriate Perl implementation, for example.

Reviewed-by: Andy Polyakov <appro@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2851)
---
 Configurations/unix-checker.pm    | 22 ++++++++++++++++++++++
 Configurations/windows-checker.pm | 22 ++++++++++++++++++++++
 Configure                         | 19 +++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 Configurations/unix-checker.pm
 create mode 100644 Configurations/windows-checker.pm

diff --git a/Configurations/unix-checker.pm b/Configurations/unix-checker.pm
new file mode 100644
index 0000000000..b39b0eb7cb
--- /dev/null
+++ b/Configurations/unix-checker.pm
@@ -0,0 +1,22 @@
+#! /usr/bin/perl
+
+use Config;
+
+# Check that the perl implementation file modules generate paths that
+# we expect for the platform
+use File::Spec::Functions qw(:DEFAULT rel2abs);
+
+if (rel2abs('.') !~ m|/|) {
+    die <<EOF;
+
+******************************************************************************
+This perl implementation doesn't produce Unix like paths (with forward slash
+directory separators).  Please use an implementation that matches your
+building platform.
+
+This Perl version: $Config{version} for $Config{archname}
+******************************************************************************
+EOF
+}
+
+1;
diff --git a/Configurations/windows-checker.pm b/Configurations/windows-checker.pm
new file mode 100644
index 0000000000..de46fbc1df
--- /dev/null
+++ b/Configurations/windows-checker.pm
@@ -0,0 +1,22 @@
+#! /usr/bin/perl
+
+use Config;
+
+# Check that the perl implementation file modules generate paths that
+# we expect for the platform
+use File::Spec::Functions qw(:DEFAULT rel2abs);
+
+if (rel2abs('.') !~ m|\\|) {
+    die <<EOF;
+
+******************************************************************************
+This perl implementation doesn't produce Windows like paths (with backward
+slash directory separators).  Please use an implementation that matches your
+building platform.
+
+This Perl version: $Config{version} for $Config{archname}
+******************************************************************************
+EOF
+}
+
+1;
diff --git a/Configure b/Configure
index 86f68c7ca0..b7d669c118 100755
--- a/Configure
+++ b/Configure
@@ -993,6 +993,25 @@ $target{build_scheme} = [ $target{build_scheme} ]
 my ($builder, $builder_platform, @builder_opts) =
     @{$target{build_scheme}};
 
+foreach my $checker (($builder_platform."-".$target{build_file}."-checker.pm",
+                      $builder_platform."-checker.pm")) {
+    my $checker_path = catfile($srcdir, "Configurations", $checker);
+    if (-f $checker_path) {
+        my $fn = $ENV{CONFIGURE_CHECKER_WARN}
+            ? sub { warn $@; } : sub { die $@; };
+        if (! do $checker_path) {
+            if ($@) {
+                $fn->($@);
+            } elsif ($!) {
+                $fn->($!);
+            } else {
+                $fn->("The detected tools didn't match the platform\n");
+            }
+        }
+        last;
+    }
+}
+
 push @{$config{defines}}, "NDEBUG"    if $config{build_type} eq "release";
 
 if ($target =~ /^mingw/ && `$target{cc} --target-help 2>&1` =~ m/-mno-cygwin/m)
-- 
2.25.1