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cmake: Avoid extra recompilation updating generated_definitions.hpp only if needed (#235)

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This commit updates the build system to ensure the generated_definitions
header is updated only if its content changed. This will avoid recompilation
if the re-configured without changing any options.
This commit is contained in:
Jean-Christophe Fillion-Robin 2017-12-02 19:21:56 -05:00 committed by Kjell Hedström
parent b4be5a0f00
commit 0005e14a9c
2 changed files with 24 additions and 12 deletions
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1
.gitignore vendored
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@ -6,5 +6,4 @@ nbproject/*
build_clang
build_travis
gtest-1.7.0
generated_definitions.hpp
*~

29
GenerateMacroDefinitionsFile.cmake
View File

@ -21,20 +21,33 @@
message( STATUS "" )
message( STATUS "COMPILE_DEFINITIONS:\n\t[${G3_DEFINITIONS}]" )
message( STATUS "" )
SET(GENERATED_G3_DEFINITIONS "${CMAKE_CURRENT_BINARY_DIR}/include/g3log/generated_definitions.hpp")
file(REMOVE ${GENERATED_G3_DEFINITIONS} )
FILE(WRITE ${GENERATED_G3_DEFINITIONS} "// AUTO GENERATED MACRO DEFINITIONS FOR G3LOG\n\n")
FILE(APPEND ${GENERATED_G3_DEFINITIONS} "${HEADER}\n")
FILE(APPEND ${GENERATED_G3_DEFINITIONS} "#pragma once\n\n")
FILE(APPEND ${GENERATED_G3_DEFINITIONS} "// CMake induced definitions below. See g3log/Options.cmake for details.\n\n")
# If it exists, read existing file
set(current_content "")
if(EXISTS ${GENERATED_G3_DEFINITIONS})
file(READ ${GENERATED_G3_DEFINITIONS} current_content)
endif()
set(generated_content "// AUTO GENERATED MACRO DEFINITIONS FOR G3LOG\n\n")
set(generated_content "${generated_content}\n${HEADER}\n")
set(generated_content "${generated_content}\n#pragma once\n\n")
set(generated_content "${generated_content}\n// CMake induced definitions below. See g3log/Options.cmake for details.\n\n")
FOREACH(definition ${G3_DEFINITIONS} )
FILE(APPEND ${GENERATED_G3_DEFINITIONS} "#define ${definition}\n")
set(generated_content "${generated_content}\n#define ${definition}\n")
ENDFOREACH(definition)
if(NOT "${current_content}" STREQUAL "${generated_content}")
message( STATUS "Generated ${GENERATED_G3_DEFINITIONS}" )
file(READ ${GENERATED_G3_DEFINITIONS} generated_content)
message( STATUS "******************** START *************************" )
MESSAGE(${generated_content})
message(${generated_content})
message( STATUS "******************** END *************************" )
file(WRITE ${GENERATED_G3_DEFINITIONS} ${generated_content})
endif()