CODEWITHSUNDEEP
bazel
Birmjin In
Birmjin In

Reputation: 129

How to check whether system has some header file using bazel build?

What I want to find is the existence of some platform specific header file. For example, in source code there will be some #ifdef section like this.

#ifdef HAVE_XXX_H
//...do something
#else
//...do other thing
#endif

In Autoconf or Cmake, there exists dedicated macro or command for detecting platform specific header file or definition. So, I can easily set 'HAVE_XXX_H' as 1 or 0 according to the result of that macro.

Using bazel, how can I achieve this kind of thing?

Thanks.

Upvotes: 2

Views: 763

Answers (2)

hlopko
hlopko

Reputation: 3270

If you are sure that the header is always present on a particular platform, use select() as elaborated by László.

If you actually need to detect the header at the build time, you will have to implement a custom repository_rule that will query the system and will generate a workspace with a header defining the macro.

Upvotes: 2

László
László

Reputation: 4271

You can use select().

Example: select() in cc_library.srcs. You can do the same in cc_library.hdrs.

Upvotes: 0

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