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Prevent accidental in-source builds with CMake, and detect when there are 

generated files from a previous in-source builds.

llvm-svn: 101665
This commit is contained in:
Chandler Carruth 2010-04-17 20:12:02 +00:00
parent 0b685eb778
commit 13bca6cd5a
1 changed files with 20 additions and 0 deletions
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20
clang/CMakeLists.txt
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@ -8,6 +8,26 @@ configure_file(
set(CLANG_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
set(CLANG_BINARY_DIR ${CMAKE_CURRENT_BINARY_DIR})
if( CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR AND NOT MSVC_IDE )
message(FATAL_ERROR "In-source builds are not allowed. CMake would overwrite "
"the makefiles distributed with LLVM. Please create a directory and run cmake "
"from there, passing the path to this source directory as the last argument. "
"This process created the file `CMakeCache.txt' and the directory "
"`CMakeFiles'. Please delete them.")
endif()
if( NOT CMAKE_SOURCE_DIR STREQUAL CMAKE_BINARY_DIR )
file(GLOB_RECURSE
tablegenned_files_on_include_dir
"${CLANG_SOURCE_DIR}/include/clang/*.inc")
if( tablegenned_files_on_include_dir )
message(FATAL_ERROR "Apparently there is a previous in-source build, "
"probably as the result of running `configure' and `make' on "
"${CLANG_SOURCE_DIR}. This may cause problems. The suspicious files are:\n"
"${tablegenned_files_on_include_dir}\nPlease clean the source directory.")
endif()
endif()
# Compute the Clang version from the contents of VER
file(READ ${CMAKE_CURRENT_SOURCE_DIR}/VER CLANG_VERSION_DATA)
string(REGEX MATCH "[0-9]+\\.[0-9]+(\\.[0-9]+)?" CLANG_VERSION