From 2677d12f20f2921b9724dc198f5e232fa9217d6a Mon Sep 17 00:00:00 2001
From: Peter Powell <petpow@saberuk.com>
Date: Thu, 4 Jul 2013 08:41:33 +0100
Subject: Automatically detect the compiler which the user has installed.

---
 configure         | 24 +++++++-----------------
 make/configure.pm | 12 +++++++++++-
 2 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/configure b/configure
index 0b3f293c0..777c6c323 100755
--- a/configure
+++ b/configure
@@ -232,16 +232,15 @@ $config{DESTINATION}	  = "BASE";				# Is target path.
 if ($config{OSNAME} =~ /darwin/i)
 {
 	$config{STARTSCRIPT}	  = "org.inspircd.plist";		# start script for OSX.
-	$config{CC} 		    = "xcrun clang++";					# C++ compiler for OSX.
 }
-else
-{
-	$config{CC} 		    = "g++";						# C++ compiler
-}
-if (defined $ENV{CXX})
-{
-	$config{CC} = $ENV{CXX};
+
+$config{CC} = defined $ENV{CXX} && !system("$ENV{CXX} -v > /dev/null 2>&1") ? $ENV{CXX} : find_compiler();
+if ($config{CC} eq "") {
+	print "A C++ compiler could not be detected on your system!\n";
+	print "Set the CXX environment variable to the full path if this is incorrect.\n";
+	exit 1;	
 }
+
 our $exec = $config{CC} . " -dumpversion | cut -c 1";
 chomp($config{GCCVER}		= `$exec`);				# Major GCC Version
 $exec = $config{CC} . " -dumpversion | cut -c 3";
@@ -253,15 +252,6 @@ if ($config{HAS_OPENSSL} =~ /^([-[:digit:].]+)(?:[a-z])?(?:\-[a-z][0-9])?/) {
 	$config{HAS_OPENSSL} = "";
 }
 
-if (($config{GCCVER} eq "") || ($config{GCCMINOR} eq "")) {
-	if ($config{OSNAME} eq 'darwin') {
-		print $config{CC} . " was not found! You require clang++ (the LLVM C++ compiler, part of the OSX developer tools) to build InspIRCd!\n";
-	} else {
-		print $config{CC} . " was not found! You require g++ (the GNU C++ compiler, part of GCC) to build InspIRCd!\n";		
-	}
-	exit;
-}
-
 # Get and Set some important vars..
 getmodules();
 
diff --git a/make/configure.pm b/make/configure.pm
index 194d439e3..c022a7493 100644
--- a/make/configure.pm
+++ b/make/configure.pm
@@ -31,10 +31,20 @@ use warnings FATAL => qw(all);
 use Exporter 'import';
 use POSIX;
 use make::utilities;
-our @EXPORT = qw(test_file test_header promptnumeric dumphash is_dir getmodules getrevision getcompilerflags getlinkerflags getdependencies nopedantic resolve_directory yesno showhelp promptstring_s module_installed);
+our @EXPORT = qw(find_compiler test_file test_header promptnumeric dumphash is_dir getmodules getrevision getcompilerflags getlinkerflags getdependencies nopedantic resolve_directory yesno showhelp promptstring_s module_installed);
 
 my $no_git = 0;
 
+sub find_compiler {
+	foreach my $compiler ('c++', 'g++', 'clang++', 'icpc') {
+		return $compiler unless system "$compiler -v > /dev/null 2>&1";
+		if ($^O eq 'Darwin') {
+			return $compiler unless system "xcrun $compiler -v > /dev/null 2>&1";
+		}
+	}
+	return "";
+}
+
 sub test_file($$;$) {
 	my ($cc, $file, $args) = @_;
 	my $status = 0;
-- 
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