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build: generate a BuildInfo translation unit with version, commit, branch, dirty flag and build kind

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cmake/BuildInfo.cmake runs on every build and rewrites the generated
BuildInfo.cpp only when something changed, so a new commit recompiles one
file and relinks. The build kind comes from DLU_BUILD_KIND
(release/ci/local) or CI=true, defaulting to local.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-29 15:43:08 -05:00
parent e74a7ea701
commit 97a6e27d56
4 changed files with 156 additions and 1 deletions
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71
cmake/BuildInfo.cmake Normal file
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# Writes BuildInfo.cpp (the data behind dCommon/BuildInfo.h) at build time.
# Run as a script:
# cmake -DSOURCE_DIR=... -DTEMPLATE=... -DOUTPUT=... -DVERSION_MAJOR=... -DVERSION_MINOR=... -DVERSION_PATCH=... -P BuildInfo.cmake
# The output is only rewritten when its contents change, so an unchanged tree recompiles nothing.
#
# Build kind comes from the environment of the build: DLU_BUILD_KIND=release|ci|local wins, otherwise CI=true
# (set by GitHub Actions and most CI systems) means ci, otherwise local.
find_package(Git QUIET)
set(BUILD_COMMIT "")
set(BUILD_BRANCH "")
set(BUILD_DIRTY "false")
if(GIT_FOUND)
execute_process(COMMAND "${GIT_EXECUTABLE}" -C "${SOURCE_DIR}" rev-parse HEAD
OUTPUT_VARIABLE BUILD_COMMIT OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET RESULT_VARIABLE result)
if(NOT result EQUAL 0)
set(BUILD_COMMIT "")
endif()
endif()
if(BUILD_COMMIT)
execute_process(COMMAND "${GIT_EXECUTABLE}" -C "${SOURCE_DIR}" rev-parse --abbrev-ref HEAD
OUTPUT_VARIABLE BUILD_BRANCH OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
if(BUILD_BRANCH STREQUAL "HEAD")
# Detached HEAD (CI checkouts): use the branch the CI names, if any.
if(NOT "$ENV{GITHUB_HEAD_REF}" STREQUAL "")
set(BUILD_BRANCH "$ENV{GITHUB_HEAD_REF}")
else()
set(BUILD_BRANCH "$ENV{GITHUB_REF_NAME}")
endif()
endif()
execute_process(COMMAND "${GIT_EXECUTABLE}" -C "${SOURCE_DIR}" update-index -q --refresh OUTPUT_QUIET ERROR_QUIET)
execute_process(COMMAND "${GIT_EXECUTABLE}" -C "${SOURCE_DIR}" diff-index --quiet HEAD --
RESULT_VARIABLE result OUTPUT_QUIET ERROR_QUIET)
if(NOT result EQUAL 0)
set(BUILD_DIRTY "true")
endif()
endif()
string(TOLOWER "$ENV{DLU_BUILD_KIND}" kind)
string(TOLOWER "$ENV{CI}" ci)
if(kind STREQUAL "release")
set(BUILD_KIND "RELEASE")
elseif(kind STREQUAL "ci" OR (kind STREQUAL "" AND (ci STREQUAL "true" OR ci STREQUAL "1")))
set(BUILD_KIND "CI")
else()
set(BUILD_KIND "LOCAL")
endif()
# Readable identifier, e.g. 3.0.0-experimental+g1a2b3c4d-dirty. Release builds leave out the branch.
set(BUILD_STRING "${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH}")
if(BUILD_BRANCH AND NOT BUILD_KIND STREQUAL "RELEASE")
string(REGEX REPLACE ".*/" "" branchName "${BUILD_BRANCH}")
string(REGEX REPLACE "[^0-9A-Za-z.-]" "-" branchName "${branchName}")
string(APPEND BUILD_STRING "-${branchName}")
endif()
if(BUILD_COMMIT)
string(SUBSTRING "${BUILD_COMMIT}" 0 8 shortCommit)
string(APPEND BUILD_STRING "+g${shortCommit}")
if(BUILD_DIRTY)
string(APPEND BUILD_STRING "-dirty")
endif()
endif()
# Git allows " in branch names; keep the C++ string literal valid.
string(REPLACE "\"" "\\\"" BUILD_BRANCH "${BUILD_BRANCH}")
configure_file("${TEMPLATE}" "${OUTPUT}" @ONLY)