Subdirectories:
abi Tests for ABI compatibility -- mangling, object layout, etc.
bprob Tests for functionality of profile-directed block ordering.
charset Tests for input character set translation.
compat Tests for binary compatibility (consistency, not ABI conformance).
conversion Tests for correct type conversions.
cpp Tests for the preprocessor.
debug Tests for debugging options.
eh Tests for exception handling.
expr Tests for expressions.
ext Tests for GNU language extensions.
gcov Tests for GCOV (code coverage) support.
inherit Tests for inheritance -- virtual functions, multiple inheritance, etc.
init Tests for initialization semantics, constructors/destructors, etc.
lookup Tests for lookup semantics, namespaces, using, etc.
opt Tests for fixes of bugs with particular optimizations.
overload Tests for overload resolution and conversions.
parse Tests for parsing.
pch Tests for precompiled headers.
rtti Tests for run-time type identification (typeid, dynamic_cast, etc.)
template Tests for templates.
tc1 Tests for Technical Corrigendum 1 conformance.
tls Tests for support of thread-local data.
tree-ssa Tests for Tree SSA optimizations.
warn Tests for compiler warnings.
other Tests that don't fit into one of the other categories.
special Tests that need custom expect code to run them; see special/ecos.exp
for an example.
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