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file(GENERATE): Only write the file if content is different. 

No policy is used to control this behavior for now.
This commit is contained in:
Stephen Kelly 2014-04-25 20:11:05 +02:00
parent 3c8226e590
commit 42e1cd137c
5 changed files with 37 additions and 12 deletions
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15
Source/cmGeneratorExpressionEvaluationFile.cxx
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@ -13,6 +13,7 @@
#include "cmGeneratorExpressionEvaluationFile.h"
#include "cmMakefile.h"
#include "cmGeneratedFileStream.h"
#include <cmsys/FStream.hxx>
#include <assert.h>
@ -79,19 +80,9 @@ void cmGeneratorExpressionEvaluationFile::Generate(const std::string& config,
this->Files.push_back(outputFileName);
outputFiles[outputFileName] = outputContent;
cmsys::ofstream fout(outputFileName.c_str());
if(!fout)
{
cmOStringStream e;
e << "Evaluation file \"" << outputFileName << "\" cannot be written.";
this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
return;
}
cmGeneratedFileStream fout(outputFileName.c_str());
fout.SetCopyIfDifferent(true);
fout << outputContent;
fout.close();
}
//----------------------------------------------------------------------------

27
Tests/RunCMake/File_Generate/RunCMakeTest.cmake
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@ -8,3 +8,30 @@ run_cmake(EmptyCondition1)
run_cmake(EmptyCondition2)
run_cmake(BadCondition)
run_cmake(DebugEvaluate)
set(timeformat "%Y%j%H%M%S")
file(REMOVE "${RunCMake_BINARY_DIR}/WriteIfDifferent-build/output_file.txt")
set(RunCMake_TEST_FILE "WriteIfDifferent")
set(RunCMake_TEST_BINARY_DIR "${RunCMake_BINARY_DIR}/WriteIfDifferent-build")
run_cmake(WriteIfDifferent-prepare)
unset(RunCMake_TEST_FILE)
unset(RunCMake_TEST_BINARY_DIR)
file(TIMESTAMP "${RunCMake_BINARY_DIR}/WriteIfDifferent-build/output_file.txt" timestamp ${timeformat})
if(NOT timestamp)
message(SEND_ERROR "Could not get timestamp for \"${RunCMake_BINARY_DIR}/WriteIfDifferent-build/output_file.txt\"")
endif()
execute_process(COMMAND ${CMAKE_COMMAND} -E sleep 1)
set(RunCMake_TEST_NO_CLEAN ON)
run_cmake(WriteIfDifferent)
file(TIMESTAMP "${RunCMake_BINARY_DIR}/WriteIfDifferent-build/output_file.txt" timestamp_after ${timeformat})
if(NOT timestamp_after)
message(SEND_ERROR "Could not get timestamp for \"${RunCMake_BINARY_DIR}/WriteIfDifferent-build/output_file.txt\"")
endif()
unset(RunCMake_TEST_NO_CLEAN)
if (NOT timestamp_after STREQUAL timestamp)
message(SEND_ERROR "WriteIfDifferent changed output file.")
endif()

1
Tests/RunCMake/File_Generate/WriteIfDifferent-result.txt Normal file
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@ -0,0 +1 @@
0

1
Tests/RunCMake/File_Generate/WriteIfDifferent-stderr.txt Normal file
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@ -0,0 +1 @@
^$

5
Tests/RunCMake/File_Generate/WriteIfDifferent.cmake Normal file
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@ -0,0 +1,5 @@
file(GENERATE
OUTPUT output_file.txt
CONTENT "123"
)