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Tyler Yankee 902ec85438 Makefile, Ninja: Fix no-op codegen builds with no CODEGEN

Ninja: Since commit 2d85779126 (Ninja: Account for explicit target
dependencies via CODEGEN, 2026-09-15, v4.5.0-rc1~162^2), a directory's
codegen phony depends on the full build of every add_dependencies
target (which caused their non-CODEGEN commands to run). Instead,
depend only on those targets' CODEGEN outputs, and follow their own
codegen dependencies in turn.

Makefiles: Since commit 197cb419d1 (add_custom_command: Add CODEGEN
support, 2024-05-27, v3.31.0-rc1~394^2), a target's `<target>/codegen`
rule used to depend on `<dep>/all` for every add_dependencies target,
which fully built them. Instead, depend on `<dep>/codegen`, except when
the target has CODEGEN commands of its own, in which case it should
still depend on `<dep>/all` as the commands may need the dependency's
outputs.

Shape up the prior `no-codegen` test case, which wasn't verifying much
of anything.

Fixes: #28205

2026-10-25 19:52:43 -04:00

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 add_custom_command(
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
   COMMAND ${CMAKE_COMMAND} -E copy
     ${CMAKE_CURRENT_SOURCE_DIR}/generated.h.in
     ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp
 )
 add_custom_target(hpp_creator ALL DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/generated.hpp)