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Reference-manual: compiler checks 

Document that compiler checks are self-contained and
do not add arguments from anywhere else.
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Nirbheek Chauhan 2018-05-09 14:43:08 +05:30 committed by GitHub
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@ -1636,6 +1636,12 @@ The following keyword arguments can be used:
`sizeof`, `has_type`, `has_function`, `has_member`, `has_members`,
`has_header_symbol`.
**Note:** These compiler checks do not use compiler arguments added with
`add_*_arguments()`, via `-Dlang_args` on the command-line, or through
`CFLAGS`/`LDFLAGS`, etc in the environment. Hence, you can trust that
the tests will be fully self-contained, and won't fail because of custom
flags added by other parts of the build file or by users.
Note that if you have a single prefix with all your dependencies, you
might find it easier to append to the environment variables
`C_INCLUDE_PATH` with GCC/Clang and `INCLUDE` with MSVC to expand the