Bump c-sdk-common & add cmake project test for C++ projects (#218)

* Squashed 'c-sdk-common/' changes from 0b7ed7f2..2838fe5b

2838fe5b Make LDValue symbols visible (#25)
fd393136 Add LDValue C++ bindings, use in tests (#23)
ff6271bc Add valgrind memory leak checker to CI (#24)

git-subtree-dir: c-sdk-common
git-subtree-split: 2838fe5b2bfd7373a58009f79003ad147d1d1637

* Add cmake project test for C++ projects

Author: cwaldren-ld

c-sdk-common/.circleci/config.yml

@@ -8,6 +8,9 @@ workflows:
   build_and_test_all:
     jobs:
       - build-test-linux
+      - build-test-linux-valgrind:
+          requires:
+            - build-test-linux
       - build-test-osx
       - build-test-windows
 
@@ -27,6 +30,23 @@ jobs:
           name: Test
           command: cd build && GTEST_OUTPUT="xml:$(pwd)/.../reports/" make test
 
+  build-test-linux-valgrind:
+    docker:
+      - image: ldcircleci/ld-c-sdk-ubuntu  # defined in sdks-ci-docker project
+    steps:
+      - checkout
+      - run:
+          name: Install prerequisites
+          command: apt-get update -y && apt-get install -y git
+      - run:
+          name: Build
+          command: mkdir -p build && cd build && cmake .. && make
+      - run:
+          name: Test with valgrind
+          command: |
+            cd build && make test
+            valgrind --error-exitcode=100 --leak-check=full ./tests/google_tests
+
   build-test-osx:
     macos:
       xcode: "12.5.1"

c-sdk-common/README.md

@@ -5,3 +5,8 @@ Shared components for `c-server-sdk`, and `c-client-sdk`. This repository is *pr
 ## Updating
 
 A git subtree is not automatically updated. From either the `c-client-sdk` or `c-server-sdk` repository run: `git subtree pull --prefix c-sdk-common git@github.com:launchdarkly/c-sdk-common.git main --squash`.
+
+## Headers
+
+All headers live in the `include` directory. Experimental APIs that aren't intended for semver should
+live in the `include/launchdarkly/experimental` subdirectory.

c-sdk-common/include/launchdarkly/experimental/README.md

@@ -0,0 +1,12 @@
+## Experimental 
+
+This directory serves as a home for experimental APIs, which may or may not graduate into the public 
+`include` directory. 
+
+Headers in this directory may be added or removed at any time, and are not guaranteed to follow 
+any semantic versioning constraints. 
+
+This means breaking changes may occur within any release.
+**Use at your own risk.**
+
+Once an experimental API proves to be valuable and stable, it may be promoted to the public `include` directory.