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build: don't download and extract tarball if source is already present

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When building under Homebrew, we want to let Homebrew manage downloading and
extracting the tarballs.
This commit is contained in:
Xu Cheng 2014-11-06 17:56:52 +08:00
parent 871e353fa8
commit 9065898264
1 changed files with 9 additions and 2 deletions
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11
third-party/cmake/DownloadAndExtractFile.cmake vendored
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@ -18,6 +18,15 @@ if(NOT DEFINED TARGET)
message(FATAL_ERROR "TARGET must be defined.")
endif()
set(SRC_DIR ${PREFIX}/src/${TARGET})
# Check whether the source has been downloaded. If true, skip it.
# Useful for external downloads like homebrew.
if(EXISTS "${SRC_DIR}" AND IS_DIRECTORY "${SRC_DIR}")
message(STATUS "${SRC_DIR} is found, skipping download and extraction. ")
return()
endif()
# Taken from ExternalProject_Add. Let's hope we can drop this one day when
# ExternalProject_Add allows you to disable SHOW_PROGRESS on the file download.
if(TIMEOUT)
@ -65,8 +74,6 @@ endif()
message(STATUS "downloading... done")
set(SRC_DIR ${PREFIX}/src/${TARGET})
# Slurped from a generated extract-TARGET.cmake file.
message(STATUS "extracting...
src='${file}'