man/man1/rdmd.1

@@ -43,6 +43,9 @@ Evaluate code as in perl -e (multiple --eval allowed)
 .IP --exclude=\fIpackage\fR
 Exclude a package from the build (multiple --exclude allowed)
 
+.IP --include=\fIpackage\fR
+Negate an --exclude switch or a package excluded by default
+
 .IP --extra-file=\fIfile\fR
 Include an extra source or object in the compilation. Useful
 if you need to add an extra object (compiled by another

rdmd.d

@@ -39,7 +39,8 @@ else
 
 private bool chatty, buildOnly, dryRun, force, preserveOutputPaths;
 private string exe, userTempDir;
-private string[] exclusions = ["std", "etc", "core"]; // packages that are to be excluded
+immutable string[] defaultExclusions = ["std", "etc", "core"];
+private string[] exclusions = defaultExclusions; // packages that are to be excluded
 private string[] extraFiles = [];
 
 version (DigitalMars)
@@ -139,6 +140,7 @@ int main(string[] args)
             "eval", &eval,
             "loop", &loop,
             "exclude", &exclusions,
+            "include", (string opt, string p) { exclusions = exclusions.filter!(ex => ex != p).array(); },
             "extra-file", &extraFiles,
             "force", &force,
             "help", { writeln(helpString); bailout = true; },
@@ -818,6 +820,7 @@ addition to compiler options, rdmd recognizes the following options:
                       (implies --chatty)
   --eval=code        evaluate code as in perl -e (multiple --eval allowed)
   --exclude=package  exclude a package from the build (multiple --exclude allowed)
+  --include=package  negate --exclude or a standard package (%-(%s, %))
   --extra-file=file  include an extra source or object in the compilation
                      (multiple --extra-file allowed)
   --force            force a rebuild even if apparently not necessary
@@ -830,7 +833,7 @@ addition to compiler options, rdmd recognizes the following options:
                      (needs dmd's option `-of` to be present)
   --man              open web browser on manual page
   --shebang          rdmd is in a shebang line (put as first argument)
-".format(defaultCompiler);
+".format(defaultCompiler, defaultExclusions);
 }
 
 // For --eval

rdmd_test.d

@@ -172,6 +172,23 @@ void runTests()
     res = execute([rdmdApp, compilerSwitch, "--force", "--exclude=dsubpack", subModObj, subModUser]);
     assert(res.status == 0, res.output);  // building with the dependency succeeds
 
+    /* Test --include. */
+    auto packFolder2 = tempDir().buildPath("std");
+    if (packFolder2.exists) packFolder2.rmdirRecurse();
+    packFolder2.mkdirRecurse();
+    scope (exit) packFolder2.rmdirRecurse();
+
+    string subModSrc2 = packFolder2.buildPath("foo.d");
+    std.file.write(subModSrc2, "module std.foo; void foobar() { }");
+
+    std.file.write(subModUser, "import std.foo; void main() { foobar(); }");
+
+    res = execute([rdmdApp, compilerSwitch, "--force", subModUser]);
+    assert(res.status == 1, res.output);  // building without the --include fails
+
+    res = execute([rdmdApp, compilerSwitch, "--force", "--include=std", subModUser]);
+    assert(res.status == 0, res.output);  // building with the --include succeeds
+
     /* Test --extra-file. */
 
     string extraFileDi = tempDir().buildPath("extraFile_.di");