Alessandro Arzilli 611e16c322 Allow linker to perform deadcode elimination for program using Cobra (#1956) ... * Restructure code to let linker perform deadcode elimination step Cobra, in its default configuration, will execute a template to generate help, usage and version outputs. Text/template execution calls MethodByName and MethodByName disables dead code elimination in the Go linker, therefore all programs that make use of cobra will be linked with dead code elimination disabled, even if they end up replacing the default usage, help and version formatters with a custom function and no actual text/template evaluations are ever made at runtime. Dead code elimination in the linker helps reduce disk space and memory utilization of programs. For example, for the simple example program used by TestDeadcodeElimination 40% of the final executable size is dead code. For a more realistic example, 12% of the size of Delve's executable is deadcode. This PR changes Cobra so that, in its default configuration, it does not automatically inhibit deadcode elimination by: 1. changing Cobra's default behavior to emit output for usage and help using simple Go functions instead of template execution 2. quarantining all calls to template execution into SetUsageTemplate, SetHelpTemplate and SetVersionTemplate so that the linker can statically determine if they are reachable Co-authored-by: Marc Khouzam <marc.khouzam@gmail.com>		2025-01-27 09:43:43 -05:00
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content	Allow linker to perform deadcode elimination for program using Cobra (#1956)	2025-01-27 09:43:43 -05:00