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25 lines
1.0 KiB
Diff
25 lines
1.0 KiB
Diff
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diff --git a/Number_types/include/CGAL/boost_mp.h b/Number_types/include/CGAL/boost_mp.h
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index 3dcaadcad21..b98980acbc5 100644
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--- a/Number_types/include/CGAL/boost_mp.h
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+++ b/Number_types/include/CGAL/boost_mp.h
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@@ -20,8 +20,18 @@
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// easy solution.
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// MSVC had trouble with versions <= 1.69:
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// https://github.com/boostorg/multiprecision/issues/98
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+//
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+// Disable also on Windows 32 bits
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+// because CGAL/cpp_float.h assumes _BitScanForward64 is available
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+// See https://learn.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64
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+//
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+// Disable also with PowerPC processors, with Boost<1.80 because of that bug:
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+// https://github.com/boostorg/multiprecision/pull/421
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+//
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#if !defined CGAL_DO_NOT_USE_BOOST_MP && \
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- (!defined _MSC_VER || BOOST_VERSION >= 107000)
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+ (!defined _MSC_VER || BOOST_VERSION >= 107000) && \
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+ (!defined _WIN32 || defined _WIN64) && \
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+ (BOOST_VERSION >= 108000 || (!defined _ARCH_PPC && !defined _ARCH_PPC64))
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#define CGAL_USE_BOOST_MP 1
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#include <CGAL/Quotient.h>
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