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cmake/PrintConfig.cmake

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+# =============================================================================
+# PrintConfig.cmake
+#
+# Script-mode bridge: lets scripts/*.sh and scripts/*.bat read values out of
+# Configuration.cmake -- this project's single source of truth (see that
+# file) -- instead of hardcoding a second copy that can silently drift out
+# of sync. This is exactly the bug it replaces: scripts/install.sh and
+# install.bat used to each hardcode their own literal "demo", with a
+# comment warning it had to be kept in sync with PROJECT_CODE_NAME by hand.
+#
+# Usage:
+#   cmake "-DPRINT_VARS=NAME1;NAME2;..." -P cmake/PrintConfig.cmake
+#
+# Prints one "NAME=value" line per requested variable, in the order given.
+# Every line is emitted via message(STATUS ...) -- deliberately: it's the
+# only message() mode CMake sends to stdout (verified directly: the
+# no-keyword default, NOTICE, and WARNING all go to stderr; STATUS is the
+# one exception), which is what lets a caller capture it with plain output
+# redirection/command substitution instead of needing a temp file. The
+# tradeoff is that STATUS always prefixes the line with "-- ", so every
+# caller strips that off along with the "NAME=" it already knows: see
+# scripts/build.sh's _pmn_read_config() or scripts/build.bat's
+# :read_config for the one small wrapper each shell dialect uses -- every
+# script that needs a value calls that wrapper rather than re-deriving
+# this convention itself.
+#
+# Runs with PMN_CONFIG_QUERY_ONLY set before including Configuration.cmake,
+# so that file skips its normal side effects (creating out/dist/,
+# rewriting .gitignore -- a value lookup shouldn't touch the filesystem,
+# and this runs far more often than a real configure) and skips resolving
+# DIST_TARGET/PLATFORM/ARCHITECTURE/COMPILER_ID, which need real compiler
+# detection (project(... LANGUAGES CXX)) that a plain `cmake -P` script
+# never performs and would get wrong. Only ask for names that don't need
+# that -- PROJECT_CODE_NAME, DEFAULT_BUILD_TYPE, and the path variables
+# are all safe; see Configuration.cmake's header for the full list of
+# what's inside vs. outside that guard.
+# =============================================================================
+
+if(NOT DEFINED PRINT_VARS)
+    message(FATAL_ERROR "Usage: cmake \"-DPRINT_VARS=NAME1;NAME2;...\" -P cmake/PrintConfig.cmake")
+endif()
+
+set(PMN_CONFIG_QUERY_ONLY TRUE)
+get_filename_component(CMAKE_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/.." ABSOLUTE)
+include("${CMAKE_SOURCE_DIR}/Configuration.cmake")
+
+foreach(_pmn_print_name ${PRINT_VARS})
+    if(NOT DEFINED ${_pmn_print_name})
+        message(FATAL_ERROR
+            "PrintConfig.cmake: '${_pmn_print_name}' is not defined by "
+            "Configuration.cmake, or isn't available in query mode -- see "
+            "that file's header ('How scripts read this file').")
+    endif()
+    message(STATUS "${_pmn_print_name}=${${_pmn_print_name}}")
+endforeach()