Annex C (informative) Compatibility [diff]

C.5 C++ and ISO C++ 2017 [diff.cpp17]

C.5.8 [library]: library introduction [diff.cpp17.library]

Affected subclause: [headers]
Change: New headers.

Rationale: New functionality.

Effect on original feature: The following C++ headers are new: <bit>, <compare>, <concepts>, <contract>, <ranges>, <span>, <syncstream>, and <version>.
Valid C++ 2017 code that #includes headers with these names may be invalid in this International Standard.
Affected subclause: [headers]
Change: Remove vacuous C++ header files.

Rationale: The empty headers implied a false requirement to achieve C compatibility with the C++ headers.

Effect on original feature: A valid C++ 2017 program that #includes any of the following headers may fail to compile: <ccomplex>, <ciso646>, <cstdalign>, <cstdbool>, and <ctgmath>.
To retain the same behavior:
  • a #include of <ccomplex> can be replaced by a #include of <complex> ([complex.syn]),
  • a #include of <ctgmath> can be replaced by a #include of <cmath> ([cmath.syn]) and a #include of <complex>, and
  • a #include of <ciso646>, <cstdalign>, or <cstdbool> can simply be removed.