Six module interfaces carry windows.h in their fragment, and a fragment's
include guard does not cross the boundary, so a unit that imported first
and included the SDK afterwards parsed it twice: clang reports it as
conflicting redeclarations of BroadcastSystemMessageEx and mismatched
uuids all through the SDK. Same shape as the basic_filebuf failure, one
level further out - the header arrives through d3d12.h, not directly.
Thirty units get a guarded windows.h ahead of everything; on Linux it is
a no-op. Vendored single-header libraries are left alone, and the block
goes after a BOM rather than before it.
The template-header propagation only walked files with a module
declaration, so EU07.cpp, windows.cpp, export_e3d_standalone.cpp and
every betterRenderer source were outside it - including the file with
main(). They reach cParser and friends through eu07.simcore and
instantiate their templates without the headers those bodies name.
Adds audit_modules.py, which checks the whole tree for the seven classes
this migration hit; all seven are clean now.
A header first pulled in through an imported module's global module
fragment leaves no include guard in the importing unit - macros do not
cross a module boundary - so a later textual include parses it again and
MSVC rejects the redefinition. Redoes the betterRenderer sweep with
placement that stays out of #if blocks, which is where the previous one
dropped <fstream> and broke nvrenderer_d3d12.cpp.
Its sources reached the standard library through the project headers they
included; those are imports now. 178 headers across 56 files, plus 18 C
library headers elsewhere for memcpy/printf and friends. MSVC's STL does
not supply these transitively the way libstdc++ does.
The module file set moves to its own eu07_modules library: a target can
only consume C++20 modules by linking the target that owns them, and
betterRenderer is a separate add_library. Its project includes become
imports.
CXX_EXTENSIONS must match across the two - a BMI built with -std=c++20
is refused by a unit compiled with -std=gnu++20.
