c - What is a file with extension .a? -

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i downloaded this: https://github.com/mongodb/mongo-c-driver

and i'm trying use inside c program, don't know generated .a files. they? couldn't find info, not in gcc manual.

and built so: 

  scons --c99

also, can use c99 libraries c89 program?

.a files static libraries typically generated archive tool. include header files associated static library , link library when compiling.


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