cmake: Add options for parallel builds to --build mode

While we already support `cmake --build . -- -j`, the options after `--`
are specific to the native build tool.  Add new options `--parallel
[<N>]` and `-j [<N>]` to abstract this and map to the proper option
for the native build tool.

1 files changed, 30 insertions, 0 deletions

diff --git a/Source/cmGlobalWatcomWMakeGenerator.cxx b/Source/cmGlobalWatcomWMakeGenerator.cxx
index 94cdb38..558ef15 100644
--- a/Source/cmGlobalWatcomWMakeGenerator.cxx
+++ b/Source/cmGlobalWatcomWMakeGenerator.cxx
@@ -7,6 +7,8 @@
 #include "cmState.h"
 #include "cmake.h"
 
+#include <ostream>
+
 cmGlobalWatcomWMakeGenerator::cmGlobalWatcomWMakeGenerator(cmake* cm)
   : cmGlobalUnixMakefileGenerator3(cm)
 {
@@ -47,3 +49,31 @@ void cmGlobalWatcomWMakeGenerator::GetDocumentation(
   entry.Name = cmGlobalWatcomWMakeGenerator::GetActualName();
   entry.Brief = "Generates Watcom WMake makefiles.";
 }
+
+void cmGlobalWatcomWMakeGenerator::GenerateBuildCommand(
+  std::vector<std::string>& makeCommand, const std::string& makeProgram,
+  const std::string& projectName, const std::string& projectDir,
+  const std::string& targetName, const std::string& config, bool fast,
+  int /*jobs*/, bool verbose, std::vector<std::string> const& makeOptions)
+{
+  this->cmGlobalUnixMakefileGenerator3::GenerateBuildCommand(
+    makeCommand, makeProgram, projectName, projectDir, targetName, config,
+    fast, cmake::NO_BUILD_PARALLEL_LEVEL, verbose, makeOptions);
+}
+
+void cmGlobalWatcomWMakeGenerator::PrintBuildCommandAdvice(std::ostream& os,
+                                                           int jobs) const
+{
+  if (jobs != cmake::NO_BUILD_PARALLEL_LEVEL) {
+    // wmake does not support parallel build level
+
+    /* clang-format off */
+    os <<
+      "Warning: Watcom's WMake does not support parallel builds. "
+      "Ignoring parallel build command line option.\n";
+    /* clang-format on */
+  }
+
+  this->cmGlobalUnixMakefileGenerator3::PrintBuildCommandAdvice(
+    os, cmake::NO_BUILD_PARALLEL_LEVEL);
+}