Prerequisites

Linux	macOS	Windows 10 (build 18917+)	Windows 10 (1709+)	Windows Vista, 7, 8, 8.1, and 10 (1507, 1511, 1607, and 1703)
none	Xcode Command Line Tools package	Windows Subsystem for Linux 2	Windows Subsystem for Linux	MSYS2 (see below)

The prerelease version of the Linux subsystem available in the 1607 and 1703 releases of Windows 10 is obsolete so consider uninstalling it.

Make sure that the build-essential, git, and libpng-dev packages are installed. The build-essential package includes the make, gcc-core, and g++ packages so they do not have to be obtained separately. MSYS2 does not include libpng-dev so it must be built from source.

Install the devkitARM toolchain of devkitPro and add its environment variables. For Windows versions without the Linux subsystem, the devkitPro graphical installer includes a preconfigured MSYS2 environment, thus the steps below are not required.

export DEVKITPRO=/opt/devkitpro
echo "export DEVKITPRO=$DEVKITPRO" >> ~/.bashrc
export DEVKITARM=$DEVKITPRO/devkitARM
echo "export DEVKITARM=$DEVKITARM" >> ~/.bashrc

Installation

To set up the repository:

git clone https://github.com/pret/pokeemerald
git clone https://github.com/pret/agbcc

cd ./agbcc
./build.sh
./install.sh ../pokeemerald

cd ../pokeemerald

To build pokeemerald.gba and confirm it matches the official ROM image:

make compare

Notes

If the base tools are not found on macOS in new Terminal sessions after the first successful build, run echo "if [ -f ~/.bashrc ]; then . ~/.bashrc; fi" >> ~/.bash_profile once to prevent the issue from occurring again. Verify that the devkitarm-rules package is installed as well; if not, install it by running sudo dkp-pacman -S devkitarm-rules.
If the repository was previously set up using Cygwin, delete the .exe files in the subfolders of the tools folder except for agbcc and try building again. Learn the differences between MSYS2 and Cygwin.

Guidance

To build pokeemerald.gba with your changes:

make

Parallel builds

See the GNU docs and this Stack Exchange thread for more information.

To speed up building, run:

make -j$(nproc)

nproc is not available on macOS. The alternative is sysctl -n hw.ncpu (relevant Stack Overflow thread).

Building without dependency scanning

If only .c or .s files were changed, turn off the dependency scanning temporarily. Changes to any other files will be ignored and the build will either fail or not reflect those changes.

make NODEP=1

Building with devkitARM's C compiler

This project supports the arm-none-eabi-gcc compiler included with devkitARM r52. To build this target, simply run:

make modern

Building with other toolchains

To build using a toolchain other than devkitARM, override the TOOLCHAIN environment variable with the path to your toolchain, which must contain the subdirectory bin.

make TOOLCHAIN="/path/to/toolchain/here"

The following is an example:

make TOOLCHAIN="/usr/local/arm-none-eabi"

To compile the modern target with this toolchain, the subdirectories lib, include, and arm-none-eabi must also be present.

Building with debug info

To build pokeemerald.elf with enhanced debug info, use the DINFO variable.

make DINFO=1

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