GIANT CLUSTERFUCK OF A COMMIT

OK, this is epic.  I was basically just trying to a) support Clang and
b) add more test coverage.  _THREE MONTHS_ and a few hundred CI runs
later, this is what I came up with.  I don't know how it ended up being
what it is, but here we go.

Some highlights of the changes:

1) CI builds has been moved to GitHub Actions,
2) the entire notion of a toolchain has been reworked; it now supports
Clang on all platforms.

* .github: this directory contains the GitHub Actions workflow
scripts/actions.  In the process, I created like 6 external GitHub
actions, but it's still pretty massive.  An upside is that it covers
much more platform/toolchain combinations _and_ check a lot of the
expected post-conditions.  TODO: .ci/Makefile is obsolete now, as well
as .travis.yml and .appveyor.yml.

* common.cmake: added Clang support.  In the process, a great deal has
been learned about how CMake works; in particular, static runtime
support has been reworked to be more robust.

* project: the entire notion of a "toolchain" has been reworked.
Instead of a measly --mingw parameter, there's now a separate --toolset
parameter, which allows you to choose between GCC, Clang, MSVC, etc.
Both Boost and CMake build scripts were enhanced greatly to support
Clang and other toolchains in a more robust way.

1 files changed, 13 insertions, 5 deletions

diff --git a/project/boost/directory.py b/project/boost/directory.py
index 17448b6..9b35194 100644
--- a/project/boost/directory.py
+++ b/project/boost/directory.py
@@ -6,6 +6,7 @@
 import logging
 import os.path
 
+from project.boost.toolchain import BootstrapToolchain
 from project.utils import cd, run
 from project.os import on_windows
 
@@ -21,18 +22,19 @@ class BoostDir:
 
     def build(self, params):
         with self._go():
-            self._bootstrap_if_required()
+            self._bootstrap_if_required(params)
             self._b2(params)
 
-    def _bootstrap_if_required(self):
+    def _bootstrap_if_required(self, params):
         if os.path.isfile(self._b2_path()):
             logging.info('Not going to bootstrap, b2 is already there')
             return
-        self.bootstrap()
+        self.bootstrap(params)
 
-    def bootstrap(self):
+    def bootstrap(self, params):
         with self._go():
-            run(self._bootstrap_path())
+            toolchain = BootstrapToolchain.detect(params.toolset)
+            run([self._bootstrap_path()] + self._bootstrap_args(toolchain))
 
     def _b2(self, params):
         for b2_params in params.enum_b2_args():
@@ -50,6 +52,12 @@ class BoostDir:
         return f'bootstrap{ext}'
 
     @staticmethod
+    def _bootstrap_args(toolchain):
+        if on_windows():
+            return toolchain.get_bootstrap_bat_args()
+        return toolchain.get_bootstrap_sh_args()
+
+    @staticmethod
     def _b2_path():
         return os.path.join('.', BoostDir._b2_name())