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  TODO: .ci/Makefile is obsolete now, as well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, 1 insertions, 1 deletions

diff --git a/.ci/verify_symbols.sh b/.ci/verify_symbols.sh
index 2fe2d5d..73cc6ba 100755
--- a/.ci/verify_symbols.sh
+++ b/.ci/verify_symbols.sh
@@ -29,7 +29,7 @@ main() {
 
     local symbol
     for symbol; do
-        if echo "$nm" | grep -F --quiet -e " $symbol"; then
+        if echo "$nm" | grep -F -e " $symbol"; then
             echo "$script_name: file '$path' has symbol '$symbol'"
         else
             echo "$script_name: symbol '$symbol' wasn't found in file '$path'"