embedded c++

Aloha everyone,
I am new to C++ and I need for a project to connect a 32-bit microcontroller with a gy-521 sensor, read and store the data. Since I have never used c++ for embedded programming I got a book, but it says there that I have to program a gcc manually by myself. Where is this going to help me? I mean there are already online new versions for gcc, why can't I just use one of them?

> for a project to connect a 32-bit microcontroller with a gy-521 sensor, read and store the data
Do you have a name for your microcontroller?
Is it some commercial off the shelf single board computer (SBC) - https://en.wikipedia.org/wiki/Single-board_computer

Most commonly available things would already have a compiler toolchain of some sort available.

Like I said, names and links to things sitting on your desk would help us point you in the right direction.
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