file(RELATIVE_PATH ofn_rel
${CMAKE_BINARY_DIR} ${CMAKE_CURRENT_BINARY_DIR}/${ofn})
set(additional_cmdline
- -o ${ofn_rel}
+ -o ${ofn_rel}.tmp
-d ${ofn_rel}.d
WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
DEPFILE ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.d
file(GLOB local_tds "*.td")
file(GLOB_RECURSE global_tds "${LLVM_MAIN_INCLUDE_DIR}/llvm/*.td")
set(additional_cmdline
- -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
+ -o ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
)
endif()
# dependency twice in the result file when
# ("${${project}_TABLEGEN_TARGET}" STREQUAL "${${project}_TABLEGEN_EXE}")
# but lets us having smaller and cleaner code here.
- add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
+ add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
+ # Generate tablegen output in a temporary file.
COMMAND ${${project}_TABLEGEN_EXE} ${ARGN} -I ${CMAKE_CURRENT_SOURCE_DIR}
${LLVM_TABLEGEN_FLAGS}
${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
${LLVM_TARGET_DEFINITIONS_ABSOLUTE}
COMMENT "Building ${ofn}..."
)
+ add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
+ # Only update the real output file if there are any differences.
+ # This prevents recompilation of all the files depending on it if there
+ # aren't any.
+ COMMAND ${CMAKE_COMMAND} -E copy_if_different
+ ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
+ ${CMAKE_CURRENT_BINARY_DIR}/${ofn}
+ DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${ofn}.tmp
+ COMMENT "Updating ${ofn}..."
+ )
# `make clean' must remove all those generated files:
- set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${ofn})
+ set_property(DIRECTORY APPEND
+ PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${ofn}.tmp ${ofn})
set(TABLEGEN_OUTPUT ${TABLEGEN_OUTPUT} ${CMAKE_CURRENT_BINARY_DIR}/${ofn} PARENT_SCOPE)
set_source_files_properties(${CMAKE_CURRENT_BINARY_DIR}/${ofn} PROPERTIES
if (Parser.ParseFile())
return 1;
- // Write output to memory.
- std::string OutString;
- raw_string_ostream Out(OutString);
- if (MainFn(Out, Records))
- return 1;
-
- // Only updates the real output file if there are any differences.
- // This prevents recompilation of all the files depending on it if there
- // aren't any.
- if (auto ExistingOrErr = MemoryBuffer::getFile(OutputFilename))
- if (std::move(ExistingOrErr.get())->getBuffer() == Out.str())
- return 0;
-
std::error_code EC;
- ToolOutputFile OutFile(OutputFilename, EC, sys::fs::F_Text);
+ ToolOutputFile Out(OutputFilename, EC, sys::fs::F_Text);
if (EC)
return reportError(argv0, "error opening " + OutputFilename + ":" +
EC.message() + "\n");
if (int Ret = createDependencyFile(Parser, argv0))
return Ret;
}
- OutFile.os() << Out.str();
+
+ if (MainFn(Out.os(), Records))
+ return 1;
if (ErrorsPrinted > 0)
return reportError(argv0, Twine(ErrorsPrinted) + " errors.\n");
// Declare success.
- OutFile.keep();
+ Out.keep();
return 0;
}