Selecting build types

Introduction

The IAR driver built into CMake provides different compiler optimization flags depending on the selected build type.

The CMake variable CMAKE_CONFIGURATION_TYPES provides four build configurations and also allows user custom build configurations.

As per CMake 3.28.1, the default build configuration types and their differences are:

Build configuration	Initial options for the IAR compiler
`Debug`	`-r`
`Release`	`-Oh -DNDEBUG`
`RelWithDebInfo`	`-Oh -DNDEBUG -r`
`MinSizeRel`	`-Ohz -DNDEBUG`

Select the desired CMAKE_BUILD_TYPE at configure-time. For example, for building using high optimization for minimal binary size:

mkdir build-MinSizeRel
cd build-MinSizeRel
cmake .. -G Ninja --toolchain /path/to/your-iar-toolchain-file.cmake -DCMAKE_BUILD_TYPE=MinSizeRel

Note

When the project is built, the compiler will initially get the selected optimization flags (-Ohz -DNDEBUG).

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