Add shortcut method for creating environments - close #149

Add env() method to create environments.
Process all environments created at build script top level before
executing any autoconf-enabled tasks, or if no tasks are specified by
the user.

build_tests/shared_library/Rsconscript

@@ -1,13 +1,11 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    libmine = env.SharedLibrary("mine", glob("src/lib/*.c"))
-    env.Program("test-shared.exe",
-                glob("src/*.c"),
-                "LIBPATH" => %w[.],
-                "LIBS" => %w[mine])
-    env.build_after("test-shared.exe", libmine)
-    env.Program("test-static.exe",
-                glob("src/**/*.c"))
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  libmine = env.SharedLibrary("mine", glob("src/lib/*.c"))
+  env.Program("test-shared.exe",
+              glob("src/*.c"),
+              "LIBPATH" => %w[.],
+              "LIBS" => %w[mine])
+  env.build_after("test-shared.exe", libmine)
+  env.Program("test-static.exe",
+              glob("src/**/*.c"))
 end

build_tests/shared_library/error_unknown_suffix.rb

@@ -1,8 +1,6 @@
-default do
-  Environment.new do |env|
-    File.open("foo.xyz", "wb") do |fh|
-      fh.puts("hi")
-    end
-    env.SharedObject("foo.o", "foo.xyz")
+env do |env|
+  File.open("foo.xyz", "wb") do |fh|
+    fh.puts("hi")
   end
+  env.SharedObject("foo.o", "foo.xyz")
 end

build_tests/shared_library/shared_library_as.rb

@@ -1,7 +1,5 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    env.Object("file.S", "src/lib/one.c", "CFLAGS" => env["CFLAGS"] + ["-S"])
-    libmine = env.SharedLibrary("mine", "file.S")
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  env.Object("file.S", "src/lib/one.c", "CFLAGS" => env["CFLAGS"] + ["-S"])
+  libmine = env.SharedLibrary("mine", "file.S")
 end

build_tests/shared_library/shared_library_cxx.rb

@@ -1,13 +1,11 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    libmine = env.SharedLibrary("mine", glob("src/lib/*.cc"))
-    env.Program("test-shared.exe",
-                glob("src/*.cc"),
-                "LIBPATH" => %w[.],
-                "LIBS" => %w[mine])
-    env.build_after("test-shared.exe", libmine)
-    env.Program("test-static.exe",
-                glob("src/**/*.cc"))
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  libmine = env.SharedLibrary("mine", glob("src/lib/*.cc"))
+  env.Program("test-shared.exe",
+              glob("src/*.cc"),
+              "LIBPATH" => %w[.],
+              "LIBS" => %w[mine])
+  env.build_after("test-shared.exe", libmine)
+  env.Program("test-static.exe",
+              glob("src/**/*.cc"))
 end

build_tests/shared_library/shared_library_d.rb

@@ -1,11 +1,9 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    libmine = env.SharedLibrary("mine", glob("src/lib/*.d"))
-    env.Program("test-shared.exe",
-                glob("src/*.c"),
-                "LIBPATH" => %w[.],
-                "LIBS" => %w[mine])
-    env.build_after("test-shared.exe", libmine)
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  libmine = env.SharedLibrary("mine", glob("src/lib/*.d"))
+  env.Program("test-shared.exe",
+              glob("src/*.c"),
+              "LIBPATH" => %w[.],
+              "LIBS" => %w[mine])
+  env.build_after("test-shared.exe", libmine)
 end

build_tests/shared_library/shared_library_from_object.rb

@@ -1,7 +1,5 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    env.SharedObject("one.o", "src/lib/one.c")
-    libmine = env.SharedLibrary("mine", ["one.o", "src/lib/two.c"])
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  env.SharedObject("one.o", "src/lib/one.c")
+  libmine = env.SharedLibrary("mine", ["one.o", "src/lib/two.c"])
 end

build_tests/shared_library/shared_library_set_shld.rb

@@ -1,14 +1,12 @@
-default do
-  Environment.new do |env|
-    env["CPPPATH"] << "src/lib"
-    env["SHLD"] = "gcc"
-    libmine = env.SharedLibrary("mine", glob("src/lib/*.c"))
-    env.Program("test-shared.exe",
-                glob("src/*.c"),
-                "LIBPATH" => %w[.],
-                "LIBS" => %w[mine])
-    env.build_after("test-shared.exe", libmine)
-    env.Program("test-static.exe",
-                glob("src/**/*.c"))
-  end
+env do |env|
+  env["CPPPATH"] << "src/lib"
+  env["SHLD"] = "gcc"
+  libmine = env.SharedLibrary("mine", glob("src/lib/*.c"))
+  env.Program("test-shared.exe",
+              glob("src/*.c"),
+              "LIBPATH" => %w[.],
+              "LIBS" => %w[mine])
+  env.build_after("test-shared.exe", libmine)
+  env.Program("test-static.exe",
+              glob("src/**/*.c"))
 end