cmake: Add options for verbose output to --build mode

While we already support `VERBOSE` environment variable and
`CMAKE_VERBOSE_MAKEFILE` cached variable, add `-v` and `--verbose`
command line options to be able to activate verbose output directly from
CMake's build tool mode command line.

Also make `msbuild` honor the verbosity setting. `xcodebuild` still
doesn't honor the verbosity setting as it will need a policy added
and reworking of cmGlobalGenerator and cmsys to support
multiple command invocation.

Help/envvar/CMAKE_NO_VERBOSE.rst

@@ -0,0 +1,8 @@
+CMAKE_NO_VERBOSE
+----------------
+
+Disables verbose output from CMake when :envvar:`VERBOSE` environment variable
+is set.
+
+Only your build tool of choice will still print verbose output when you start
+to actually build your project.

Help/envvar/VERBOSE.rst

@@ -0,0 +1,10 @@
+VERBOSE
+-------
+
+Activates verbose output from CMake and your build tools of choice when
+you start to actually build your project.
+
+Note that any given value is ignored. It's just checked for existence.
+
+See also :ref:`Build Tool Mode <Build Tool Mode>` and
+:envvar:`CMAKE_NO_VERBOSE` environment variable

Help/manual/cmake-env-variables.7.rst

@@ -24,11 +24,13 @@ Environment Variables that Control the Build
    /envvar/CMAKE_BUILD_PARALLEL_LEVEL
    /envvar/CMAKE_CONFIG_TYPE
    /envvar/CMAKE_MSVCIDE_RUN_PATH
+   /envvar/CMAKE_NO_VERBOSE
    /envvar/CMAKE_OSX_ARCHITECTURES
    /envvar/DESTDIR
    /envvar/LDFLAGS
    /envvar/MACOSX_DEPLOYMENT_TARGET
    /envvar/PackageName_ROOT
+   /envvar/VERBOSE
 
 Environment Variables for Languages
 ===================================

Help/manual/cmake.1.rst

@@ -289,6 +289,14 @@ following options:
 ``--use-stderr``
   Ignored.  Behavior is default in CMake >= 3.0.
 
+``-v, --verbose``
+  Enable verbose output - if supported - including the build commands to be
+  executed.
+
+  This option can be omitted if :envvar:`VERBOSE` environment variable or
+  :variable:`CMAKE_VERBOSE_MAKEFILE` cached variable is set.
+
+
 ``--``
   Pass remaining options to the native tool.
 

Help/release/dev/cmake-build-verbose.rst

@@ -0,0 +1,6 @@
+cmake-build-verbose
+-------------------
+
+* The :manual:`cmake(1)` :ref:`Build Tool Mode` (``cmake --build``) gained
+  ``--verbose`` and ``-v`` options to specify verbose build output. Some
+  generators such as Xcode don't support this option currently.

Source/cmGlobalUnixMakefileGenerator3.cxx

@@ -493,7 +493,7 @@ void cmGlobalUnixMakefileGenerator3::GenerateBuildCommand(
   GeneratedMakeCommand& 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)
+  int jobs, bool verbose, std::vector<std::string> const& makeOptions)
 {
   std::unique_ptr<cmMakefile> mfu;
   cmMakefile* mf;
@@ -510,6 +510,13 @@ void cmGlobalUnixMakefileGenerator3::GenerateBuildCommand(
     mf = mfu.get();
   }
 
+  // Make it possible to set verbosity also from command line
+  if (verbose) {
+    makeCommand.add(cmSystemTools::GetCMakeCommand());
+    makeCommand.add("-E");
+    makeCommand.add("env");
+    makeCommand.add("VERBOSE=1");
+  }
   makeCommand.add(this->SelectMakeProgram(makeProgram));
 
   if (jobs != cmake::NO_BUILD_PARALLEL_LEVEL) {

Source/cmGlobalVisualStudio10Generator.cxx

@@ -961,6 +961,10 @@ void cmGlobalVisualStudio10Generator::GenerateBuildCommand(
     makeCommand.add("/p:CL_MPCount=1");
   }
 
+  // Respect the verbosity: 'n' normal will show build commands
+  //                        'm' minimal only the build step's title
+  makeCommand.add(std::string("/v:") + ((verbose) ? "n" : "m"));
+
   makeCommand.add(makeOptions.begin(), makeOptions.end());
 }
 

Source/cmake.cxx

@@ -2539,7 +2539,8 @@ cmMessenger* cmake::GetMessenger() const
 
 int cmake::Build(int jobs, const std::string& dir, const std::string& target,
                  const std::string& config,
-                 const std::vector<std::string>& nativeOptions, bool clean)
+                 const std::vector<std::string>& nativeOptions, bool clean,
+                 bool verbose)
 {
 
   this->SetHomeDirectory("");
@@ -2592,11 +2593,11 @@ int cmake::Build(int jobs, const std::string& dir, const std::string& target,
     return 1;
   }
   projName = cachedProjectName;
-  bool verbose = false;
+
   const char* cachedVerbose =
     this->State->GetCacheEntryValue("CMAKE_VERBOSE_MAKEFILE");
-  if (cachedVerbose) {
+  if (cmSystemTools::IsOn(cachedVerbose)) {
-    verbose = cmSystemTools::IsOn(cachedVerbose);
+    verbose = true;
   }
 
 #ifdef CMAKE_HAVE_VS_GENERATORS

Source/cmake.h

@@ -430,7 +430,8 @@ public:
   ///! run the --build option
   int Build(int jobs, const std::string& dir, const std::string& target,
             const std::string& config,
-            const std::vector<std::string>& nativeOptions, bool clean);
+            const std::vector<std::string>& nativeOptions, bool clean,
+            bool verbose);
 
   ///! run the --open option
   bool Open(const std::string& dir, bool dryRun);

Source/cmakemain.cxx

@@ -68,6 +68,8 @@ static const char* cmDocumentationUsageNote[][2] = {
     "  --clean-first  = Build target 'clean' first, then build.\n"            \
     "                   (To clean only, use --target 'clean'.)\n"             \
     "  --use-stderr   = Ignored.  Behavior is default in CMake >= 3.0.\n"     \
+    "  -v --verbose   = Enable verbose output - if supported - including\n"   \
+    "                   the build commands to be executed. \n"                \
     "  --             = Pass remaining options to the native tool.\n"
 
 static const char* cmDocumentationOptions[][2] = {
@@ -395,6 +397,7 @@ static int do_build(int ac, char const* const* av)
   std::string dir;
   std::vector<std::string> nativeOptions;
   bool clean = false;
+  bool verbose = cmSystemTools::HasEnv("VERBOSE");
   bool hasTarget = false;
 
   enum Doing
@@ -435,6 +438,10 @@ static int do_build(int ac, char const* const* av)
     } else if (strcmp(av[i], "--clean-first") == 0) {
       clean = true;
       doing = DoingNone;
+    } else if ((strcmp(av[i], "--verbose") == 0) ||
+               (strcmp(av[i], "-v") == 0)) {
+      verbose = true;
+      doing = DoingNone;
     } else if (strcmp(av[i], "--use-stderr") == 0) {
       /* tolerate legacy option */
     } else if (strcmp(av[i], "--") == 0) {
@@ -493,7 +500,7 @@ static int do_build(int ac, char const* const* av)
   cmake cm(cmake::RoleInternal, cmState::Unknown);
   cmSystemTools::SetMessageCallback(cmakemainMessageCallback, &cm);
   cm.SetProgressCallback(cmakemainProgressCallback, &cm);
-  return cm.Build(jobs, dir, target, config, nativeOptions, clean);
+  return cm.Build(jobs, dir, target, config, nativeOptions, clean, verbose);
 #endif
 }