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Philippe Blain 3821c38068 Makefile: add support for generating JSON compilation database 
Tools based on LibClang [1] can make use of a 'JSON Compilation
Database' [2] that keeps track of the exact options used to compile a set
of source files.

For example, clangd [3], which is a C language server protocol
implementation, can use a JSON compilation database to determine the
flags needed to compile a file so it can provide proper editor
integration.  As a result, editors supporting the language server
protocol (such as VS Code, Emacs, or Vim, with suitable plugins) can
provide better searching, integration, and refactoring tools.

The Clang compiler can generate JSON fragments when compiling [4],
using the `-MJ` flag. These JSON fragments (one per compiled source
file) can then be concatenated to create the compilation database,
commonly called 'compile_commands.json'.

Add support to the Makefile for generating these JSON fragments as well
as the compilation database itself, if the environment variable
'GENERATE_COMPILATION_DATABASE' is set.

If this variable is set, check that $(CC) indeed supports the `-MJ`
flag, following what is done for automatic dependencies.

All JSON fragments are placed in the 'compile_commands/' directory, and
the compilation database 'compile_commands.json' is generated as a
dependency of the 'all' target using a `sed` invocation.

[1] https://clang.llvm.org/docs/Tooling.html
[2] https://clang.llvm.org/docs/JSONCompilationDatabase.html
[3] https://clangd.llvm.org/
[4] https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mj-arg

Helped-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-09-06 12:22:26 -07:00

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