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Only modify lto.exports.def when contents have changed. 

Patch by Greg Bedwell.

llvm-svn: 192182
This commit is contained in:
Rafael Espindola 2013-10-08 15:07:00 +00:00
parent a17151ad5a
commit 3f359430b3
1 changed files with 9 additions and 3 deletions
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12
llvm/tools/lto/CMakeLists.txt
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@ -15,10 +15,16 @@ if( NOT CYGWIN AND LLVM_ENABLE_PIC )
# 'EXPORTS'. The file "lto.exports" already contains the list, so we
# massage it into the correct format here to create "lto.exports.def".
set(LTO_EXPORTS_DEF ${CMAKE_CURRENT_BINARY_DIR}/lto.exports.def)
set(LTO_EXPORTS_DEF_TEMP ${LTO_EXPORTS_DEF}.txt)
file(READ "lto.exports" exports_list)
file(WRITE ${LTO_EXPORTS_DEF} "LIBRARY LTO\n")
file(APPEND ${LTO_EXPORTS_DEF} "EXPORTS\n")
file(APPEND ${LTO_EXPORTS_DEF} ${exports_list})
file(WRITE ${LTO_EXPORTS_DEF_TEMP} "LIBRARY LTO\n")
file(APPEND ${LTO_EXPORTS_DEF_TEMP} "EXPORTS\n")
file(APPEND ${LTO_EXPORTS_DEF_TEMP} ${exports_list})
# Copy the file only if it has changed.
execute_process(COMMAND ${CMAKE_COMMAND} -E copy_if_different
${LTO_EXPORTS_DEF_TEMP} ${LTO_EXPORTS_DEF})
set(SHARED_LIB_SOURCES ${SOURCES} ${LTO_EXPORTS_DEF})
else()
set(SHARED_LIB_SOURCES ${SOURCES})