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  TODO: .ci/Makefile is obsolete now, as well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, 23 insertions, 0 deletions

diff --git a/.github/actions/check-arch/action.yml b/.github/actions/check-arch/action.yml
new file mode 100644
index 0000000..b85be4e
--- /dev/null
+++ b/.github/actions/check-arch/action.yml
@@ -0,0 +1,23 @@
+name: Verify architecture
+description: Verify target architecture
+inputs:
+  path:
+    description: Installation directory
+    required: true
+  expected:
+    description: Target platform
+    required: true
+runs:
+  using: composite
+  steps:
+    - run: |
+        $script_path = if ($env:CI_TARGET_PE) {
+            Join-Path $env:GITHUB_WORKSPACE '.ci' 'verify_arch.ps1'
+        } else {
+            Join-Path $env:GITHUB_WORKSPACE '.ci' 'verify_arch.sh'
+        }
+
+        $exe_path = (Join-Path '${{ inputs.path }}' 'bin' 'foo') + $env:CI_EXE_EXT
+
+        & $script_path $exe_path '${{ inputs.expected }}'
+      shell: pwsh