Add SYSTEMC_UNITY_BUILD CMake option and require CMake 3.16+#119
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lmailletcontoz merged 1 commit intoaccellera-official:mainfrom May 20, 2025
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This patch introduces a new CMake option -DSYSTEMC_UNITY_BUILD=ON to enable unity builds for the SystemC library, which may improve build performance in some environments. Enabling this option compiles the sources as a single compilation unit. The option is OFF by default and does not affect standard builds. The minimum required CMake version is raised to 3.16 to support this feature. Signed-off-by: Ruben Brandhofer <ruben@mwa.re>
lmailletcontoz
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This patch introduces a new CMake option -DSYSTEMC_UNITY_BUILD=ON to enable unity builds for the SystemC library, which may improve build performance in some environments.
Enabling this option compiles the sources as a single compilation unit. The option is OFF by default and does not affect standard builds.
The minimum required CMake version is raised to 3.16 to support this feature.
Rationale
Unity builds can significantly reduce build time in some build environments, especially those with many small translation units or slower filesystems.
CMake 3.16 is the first version that supports the required features (specifically UNITY_BUILD mode via target_sources() and target_sources(FILE_SET) logic).
Tested on
Build times were roughly halved by turning on the build option.