4.2. Static vs. Dynamic options
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## 4.2. Static vs. Dynamic options

Each of GHC's command line options is classified as either static or dynamic. A static flag may only be specified on the command line, whereas a dynamic flag may also be given in an `OPTIONS_GHC` pragma in a source file or set from the GHCi command-line with `:set`.

As a rule of thumb, options which relate to filenames are static, and the rest are dynamic. The flag reference tables (Section 4.17, “Flag reference”) lists the status of each flag.

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