Adapt default sc.ini to MsCoff by default

The old configuration still used OPTLINk for `-m32` which obviously
doesn't support MsCoff files. Also added a test file that builds and
executes a small program using the configurations in `ini` and `build.d`
(as allmost all  other tests run with `-conf=`).

ini/windows/bin/sc.ini

@@ -7,15 +7,16 @@ version=7.51 Build 020
 DFLAGS="-I%@P%\..\..\src\phobos" "-I%@P%\..\..\src\druntime\import"
 
 ; optlink only reads from the Environment section so we need this redundancy
-; from the Environment32 section (bugzilla 11302)
+; from the Environment32omf section (bugzilla 11302)
 LIB="%@P%\..\lib"
 
-
 [Environment32]
+LIB=%@P%\..\lib32mscoff
+
+[Environment32omf]
 LIB="%@P%\..\lib"
 LINKCMD=%@P%\optlink.exe
 
-
 [Environment64]
 LIB=%@P%\..\lib64
 

src/build.d

@@ -309,6 +309,9 @@ alias dmdConf = makeRule!((builder, rule) {
 DFLAGS="-I%@P%\..\..\..\..\..\druntime\import" "-I%@P%\..\..\..\..\..\phobos"
 LIB="%@P%\..\..\..\..\..\phobos"
 
+[Environment32]
+DFLAGS=%DFLAGS% -L/OPT:NOICF
+
 [Environment64]
 DFLAGS=%DFLAGS% -L/OPT:NOICF
 

test/dshell/defaults.d

@@ -0,0 +1,78 @@
+/// Verifies that DMD using default settings work as expected
+/// when using the default configuration + some example programs
+module defaults;
+
+import std.algorithm;
+import std.file;
+import std.path;
+import std.stdio;
+
+import dshell;
+
+int main(const string[] args)
+{
+	// dshellPrebuiltInit("dshell", "defaults");
+
+	try
+	{
+		testConfigurations();
+		return 0;
+	}
+	catch (Throwable t)
+	{
+		writeln(t.msg);
+		return 1;
+	}
+}
+
+void testConfigurations()
+{
+	// Compilation targets
+	const string[] targets = [ MODEL ];
+
+	// Configuration file
+	version (Windows)
+		const string config = `bin\sc.ini`;
+	else version (OSX)
+		const string config = `bin/dmd.conf`;
+	else
+		const string config = `bin` ~ MODEL ~ `/dmd.conf`;
+
+	// Static configuration file for the final release
+	string configPath = buildNormalizedPath(dirName(__FILE_FULL_PATH__), "..", "..", "ini", OS, config);
+
+	// Flag sets to test
+	string[] extraFlags = [
+		// Minimal configuration generated by build.d
+		"",
+		// Predefined, full configuration located in ini
+		"-conf=" ~ configPath
+	];
+
+	version (Windows) if (MODEL == "32omf")
+	{
+		// 32-OMF tries to use `optlink.exe` located next to `sc.ini`
+		// and also doesn't like the LIB setup, so skip it for now
+		extraFlags = [""];
+	}
+
+	foreach (const target; targets)
+	{
+		foreach (const flags; extraFlags)
+		{
+			run(
+				`$DMD ` ~ flags ~ ` -g -m` ~ target
+				~ ` -I$EXTRA_FILES/defaults `
+				~ DFLAGS
+				~ ` $EXTRA_FILES/defaults/hello.d `
+				~ ` -of=$OUTPUT_BASE/hello$EXE `,
+			);
+
+			auto pipe = std.process.pipe();
+			run(`$OUTPUT_BASE/hello$EXE`, pipe.writeEnd, stderr);
+			const output = cast(string) pipe.readEnd.byChunk(4096).join();
+			stdout.writeln(output);
+			assert(output.canFind("Hello, World from D!"));
+		}
+	}
+}

test/dshell/extra-files/defaults/hello.d

@@ -0,0 +1,9 @@
+// A common yet underrated D program
+module defaults.hello;
+
+import std.stdio;
+
+void main()
+{
+	writeln("Hello, World from D!");
+}

test/tools/dshell_prebuilt/dshell_prebuilt.d

@@ -39,6 +39,7 @@ struct Vars
         return result;
     }
     static string opDispatch(string name)() { return get(name); }
+    static void opDispatch(string name)(string value) { set(name, value); }
 }
 
 private alias requiredEnvVars = AliasSeq!(