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[skip changelog] Document automatic generation of recipe.preproc.macros #869

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Jul 28, 2020
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[skip changelog] Document automatic generation of recipe.preproc.macros #869

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2 changes: 2 additions & 0 deletions docs/platform-specification.md
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Expand Up @@ -293,6 +293,8 @@ which will usually result in a permission error. Since platforms typically inclu
includes `-MMD`, the `-MMD` option is automatically filtered out of the `recipe.preproc.macros` recipe to prevent this
error.

If **recipe.preproc.macros** is not defined, it is automatically generated from **recipe.cpp.o.pattern**.

Note that older Arduino IDE versions used the **recipe.preproc.includes** recipe to determine includes, which is
undocumented here. Since Arduino IDE 1.6.7 (arduino-builder 1.2.0) this was changed and **recipe.preproc.includes** is
no longer used.
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