Allow to build library without tests and examples

[avsej]

• tests for memory exporters are not guarded by BUILD_TESTING
• include(CTest) itself, with internally defines BUILD_TESTING have to be optional
• expose WITH_EXAMPLES option to allow skipping examples

[codecov]

Codecov Report

Merging #367 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #367   +/-   ##
=======================================
  Coverage   94.91%   94.91%           
=======================================
  Files         155      155           
  Lines        6882     6882           
=======================================
  Hits         6532     6532           
  Misses        350      350           

[avsej]

completed cmake-format -i on both files, hopefully it will make CI happy

[avsej]

@reyang @ThomsonTan @pyohannes, could you help me with your cmake-format setup? your project does not have .cmake-format.yaml and it seems like CI is using some pretty old version of cmake-format. Feel free to update my patch if necessary, I just want to use the library but don't want to build and run testsuite.

[lalitb]

@reyang @ThomsonTan @pyohannes, could you help me with your cmake-format setup? your project does not have .cmake-format.yaml and it seems like CI is using some pretty old version of cmake-format. Feel free to update my patch if necessary, I just want to use the library but don't want to build and run testsuite.

Buildifier is used for formatting. you need to first install it by running this script, and then do formatting using ci/do-ci.sh format from here. Ensure to commit formatted file.

[avsej]

Thank you, @lalitb. Now it looks good. The problem was really in that the CI is using outdated cmake-format.

[ThomsonTan]

What's the current stable version of cmake-format? Perhaps we should upgrade it to avoid such kind of spurious CI failure.

[avsej]

cmake-format 0.6.13
https://pypi.org/project/cmake-format/