Re: [PATCH 2/3] cmake: create compile_commands.json by default

On Fri, Jun 4, 2021 at 11:13 PM Matthew Rogers via GitGitGadget
[off-list ref] wrote:

A straightforward way to accomplish this is to make it as simple as
possible is to enable the generation of the compile_commands.json file,
which is supported by many tools such as: clang-tidy, clang-format,
sourcetrail, etc.

This does come with a small run-time overhead during the configuration
step (~6 seconds on my machine):

    Time to configure with CMAKE_EXPORT_COMPILE_COMMANDS=TRUE

    real    1m9.840s
    user    0m0.031s
    sys     0m0.031s

    Time to configure with CMAKE_EXPORT_COMPILE_COMMANDS=FALSE

    real    1m3.195s
    user    0m0.015s
    sys     0m0.015s

This seems like a small enough price to pay to make the project more
accessible to newer users.  Additionally there are other large projects
like llvm [2] which has had this enabled by default for >6 years at the
time of this writing, and no real negative consequences that I can find
with my search-skills.

The overhead is actually much smaller than that. In my system it is
less than 150ms.
The first configure takes this long because we generate command-list.h
and config-list.h.
This process is really slow under Windows.

Thank You,
Sibi Siddharthan