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* Fix "bootstrap.bat borland" failing to find label "Test_Path" If an override toolset is given in the `bootstrap.bat` command-line, `bootstrap.bat` -> `src/engine/build.bat` bypasses loading `src/engine/guess_toolset.bat` entirely. Later on the call to `Test_Path` from `build.bat` -> `config_toolset.bat` fails to find that label. Fix this by making a new parameterized entry-point `test_path` inside `guess_toolset.bat` for this caller in `config_toolset.bat`. Fixes: #382. * Handle spaces in C++Builder toolchain path Nowadays a default installation goes into %PROGRAMFILES%, e.g. "C:\Program Files (x86)\Embarcadero\Studio\20.0\Bin". * Add "-Nd" before "/D"-options for bcc32.exe The preprocessor of the old Borland/C++Builder compiler (bcc32.exe) by default does not accept preprocessor statements of the form: #if SYMBOL_NAME where `SYMBOL_NAME` was `#define`-ed without a value. It insists on the `#if defined(SYMBOL_NAME)` or `#ifdef SYMBOL_NAME` forms (emitting error E2188 "expression syntax"). The workaround is to specify the `-Nd` option before the offending `/D` options, which effectively provides a value of "1" to the symbols being #define-ed. Apply this workaround in the recipes of `bjam` and `b2` to satisfy the preprocessor. The alternative here would be to migrate to the Clang-based (and much more standard-compliant) bcc32c.exe, but that would be a more involved change. * Separate :Guess_Yacc logic from :Guess_Toolset in build.bat This was an existing benign issue introduced in00c2358, but it became apparent after9339693.
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