The solution we arrived at was to write a https://behat.org/ <https://behat.org/> backend to perform automated tests of our incremental builds. The Behat backend copies the project's source tree to a temporary folder, then runs a scripted test suite on it, which looks like this:
Feature: Incremental builds Check that modifying certain source files causes certain build steps to be performed (or not performed). Scenario: Editing a core type header Given a completed build When I edit type/integer.h And I build Then it should update lib/MyFramework.framework/Headers/integer.h And it should update lib/MyFramework.framework/MyFramework And it should update bin/MyApp.app/Contents/Frameworks/MyFramework.framework/Headers/integer.h And it should update bin/MyApp.app/Contents/Frameworks/MyFramework.framework/MyFramework And it should update the compiler's cache Scenario: … Feature: Compiler developer mode Check that compiler developer mode properly reduces build dependencies, to reduce edit-compile-run cycle time when working on the compiler. Scenario: Enabling compiler developer mode Given a completed build When I run CMake with arguments "-DCOMPILER_DEVELOPER=ON" And I build Then it shouldn't do anything Scenario: Editing a compiler source file when in compiler developer mode Given a completed build When I edit compiler/compiler.cc <http://compiler.cc/> And I build Then it should update lib/libMyCompiler.a And it should update bin/my-compiler But it shouldn't update the compiler's cache And it shouldn't update bin/something-compiled-using-my-compiler Scenario: …
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