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[cxxmodules] Also load STL/libc as a core module #1317

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Merged
vgvassilev merged 2 commits into from
Nov 14, 2017
Merged

[cxxmodules] Also load STL/libc as a core module #1317

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5bfe855
[cxxmodules] Also load STL/libc as a core module
Teemperor Nov 13, 2017
6d42945
[cxxmodules] #undef I coming from complex.h
Teemperor Nov 14, 2017
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22 changes: 21 additions & 1 deletion core/metacling/src/TCling.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -1100,19 +1100,30 @@ static void LoadCoreModules(cling::Interpreter &interp)

clang::HeaderSearch &headerSearch = CI.getPreprocessor().getHeaderSearchInfo();
clang::ModuleMap &moduleMap = headerSearch.getModuleMap();
// List of core modules we can load, but it's ok if they are missing because
// the system doesn't have these modules.
std::vector<std::string> optionalCoreModuleNames = {"stl", "libc"};

// List of core modules we need to load.
std::vector<std::string> neededCoreModuleNames = {"Core", "RIO"};
std::vector<std::string> missingCoreModuleNames;

std::vector<clang::Module *> coreModules;

// Lookup the optional core modules in the modulemap by name.
for (std::string moduleName : optionalCoreModuleNames) {
clang::Module *module = moduleMap.findModule(moduleName);
// Don't report an error here, the module is optional.
if (module)
coreModules.push_back(module);
}
// Lookup the core modules in the modulemap by name.
for (std::string moduleName : neededCoreModuleNames) {
clang::Module *module = moduleMap.findModule(moduleName);
if (module) {
coreModules.push_back(module);
} else {
// If we can't find a module, we record that to report it later.
// If we can't find a needed module, we record that to report it later.
missingCoreModuleNames.push_back(moduleName);
}
}
Expand Down Expand Up @@ -1151,6 +1162,15 @@ static void LoadCoreModules(cling::Interpreter &interp)
for (StringRef H : moduleHeaders) {
declarations << "#include \"" << H.str() << "\"\n";
}

// C99 decided that it's a very good idea to name a macro `I` (the letter I).
// This seems to screw up nearly all the template code out there as `I` is
// common template parameter name and iterator variable name.
// Let's follow the GCC recommendation and undefine `I` in case any of the
// core modules have defined it:
// https://www.gnu.org/software/libc/manual/html_node/Complex-Numbers.html
declarations << "#ifdef I\n #undef I\n #endif\n";

auto result = interp.declare(declarations.str());

if (result != cling::Interpreter::CompilationResult::kSuccess) {
Expand Down