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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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[cxxmodules] #undef I coming from complex.h 
If we preload the core modules that can contain complex.h, we
break a lot of tests that name variables or template arguments I.
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@Teemperor
Teemperor committed Nov 14, 2017
commit 6d42945ca5579f952fbf6af80cac6d57ae6afcad
9 changes: 9 additions & 0 deletions core/metacling/src/TCling.cxx
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Expand Up @@ -1162,6 +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) {
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