From af033ee4e097c26512e8f5b6927be77881237de3 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Tue, 6 Nov 2018 21:45:29 -0500
Subject: [PATCH] fill in ConfigureOp#test_c_compiler

---
 lib/rscons/application.rb  |  2 +-
 lib/rscons/configure_op.rb | 25 ++++++++++++++++++++++++-
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/lib/rscons/application.rb b/lib/rscons/application.rb
index 2cb9786..e7bad87 100644
--- a/lib/rscons/application.rb
+++ b/lib/rscons/application.rb
@@ -88,7 +88,7 @@ module Rscons
         if ccc = @script.check_c_compiler
           co.check_c_compiler(ccc)
         end
-      rescue ConfigureOp::ConfigFailure
+      rescue ConfigureOp::ConfigureFailure
         rv = 1
       end
       co.close
diff --git a/lib/rscons/configure_op.rb b/lib/rscons/configure_op.rb
index 3c13b74..f82896f 100644
--- a/lib/rscons/configure_op.rb
+++ b/lib/rscons/configure_op.rb
@@ -1,11 +1,12 @@
 require "fileutils"
+require "open3"
 
 module Rscons
   # Class to manage a configure operation.
   class ConfigureOp
 
     # Exception raised when a configuration error occurs.
-    class ConfigFailure < Exception; end
+    class ConfigureFailure < Exception; end
 
     # Create a ConfigureOp.
     #
@@ -51,6 +52,28 @@ module Rscons
     # @return [Boolean]
     #   Whether the C compiler tested successfully.
     def test_c_compiler(cc)
+      File.open("#{@work_dir}/cfgtest.c", "wb") do |fh|
+        fh.puts <<-EOF
+          #include <stdio.h>
+          int main(int argc, char * argv[]) {
+            printf("Hello.\\n");
+            return 0;
+          }
+        EOF
+      end
+      case cc
+      when "gcc"
+        command = %W[gcc -o #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.c]
+      when "clang"
+        command = %W[clang -o #{@work_dir}/cfgtest.exe #{@work_dir}/cfgtest.c]
+      else
+        raise ConfigureFailure.new("Unknown C compiler (#{cc})")
+      end
+      @log_fh.puts("Command: #{command.join(" ")}")
+      stdout, stderr, status = Open3.capture3(*command)
+      @log_fh.write(stdout)
+      @log_fh.write(stderr)
+      status != 0
     end
 
   end