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Windows: Prevent auto exports to be regenerated on every build

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Check modified time stamps of input files against an existing exports file
before generating the auto exports.

Fixes: #19650
This commit is contained in:
Daniel Eiband
2019-08-28 13:57:52 +02:00
parent 6db8f6a410
commit ff5028c531
4 changed files with 65 additions and 11 deletions
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Source/cmcmd.cxx
+25 -8
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@@ -562,19 +562,36 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args)
"objlistfile [-nm=nm-path]\n";
return 1;
}
FILE* fout = cmsys::SystemTools::Fopen(args[2].c_str(), "w+");
if (!fout) {
std::cerr << "could not open output .def file: " << args[2].c_str()
<< "\n";
return 1;
}
cmsys::ifstream fin(args[3].c_str(), std::ios::in | std::ios::binary);
if (!fin) {
std::cerr << "could not open object list file: " << args[3].c_str()
<< "\n";
return 1;
}
std::string file;
std::vector<std::string> files;
{
std::string file;
cmFileTime outTime;
bool outValid = outTime.Load(args[2]);
while (cmSystemTools::GetLineFromStream(fin, file)) {
files.push_back(file);
if (outValid) {
cmFileTime inTime;
outValid = inTime.Load(file) && inTime.Older(outTime);
}
}
if (outValid) {
// The def file already exists and all input files are older than the
// existing def file.
return 0;
}
}
FILE* fout = cmsys::SystemTools::Fopen(args[2].c_str(), "w+");
if (!fout) {
std::cerr << "could not open output .def file: " << args[2].c_str()
<< "\n";
return 1;
}
bindexplib deffile;
if (args.size() >= 5) {
auto a = args[4];
@@ -585,7 +602,7 @@ int cmcmd::ExecuteCMakeCommand(std::vector<std::string> const& args)
std::cerr << "unknown argument: " << a << "\n";
}
}
while (cmSystemTools::GetLineFromStream(fin, file)) {
for (auto const& file : files) {
std::string const& ext = cmSystemTools::GetFilenameLastExtension(file);
if (cmSystemTools::LowerCase(ext) == ".def") {
if (!deffile.AddDefinitionFile(file.c_str())) {