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[2025-06 CWG Motion 2] Core Language Working Group "ready" Issues for the June, 2025 meeting #7984

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[2025-06 CWG Motion 2] Core Language Working Group "ready" Issues for the June, 2025 meeting #7984

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ed046ea
CWG3013 Disallowing macros for #embed parameters
tkoeppe Jun 22, 2025
a09e65b
CWG3014 Comma-delimited vs. comma-separated output for #embed
tkoeppe Jun 22, 2025
afbc74d
CWG3020 Missing specification for __has_cpp_attribute(indeterminate)
tkoeppe Jun 22, 2025
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17 changes: 15 additions & 2 deletions source/preprocessor.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -275,6 +275,11 @@
semantics.

\pnum
If one of the \grammarterm{pp-tokens} of a \tcode{\#embed} directive
(before macro replacement) is the \grammarterm{identifier}
\tcode{limit}, \tcode{prefix}, \tcode{suffix}, or \tcode{if_empty}
and that \grammarterm{identifier} is defined
as a macro\iref{cpp.replace.general}, the program is ill-formed.
Any \grammarterm{embed-prefixed-parameter} is conditionally-supported,
with \impldef{supported forms of \#embed prefix parameters} semantics.

Expand Down Expand Up @@ -482,6 +487,7 @@
\tcode{assume} & \tcode{202207L} \\
\tcode{deprecated} & \tcode{201309L} \\
\tcode{fallthrough} & \tcode{201603L} \\
\tcode{indeterminate} & \tcode{202403L} \\
\tcode{likely} & \tcode{201803L} \\
\tcode{maybe_unused} & \tcode{201603L} \\
\tcode{no_unique_address} & \tcode{201803L} \\
Expand Down Expand Up @@ -525,6 +531,13 @@
\tcode{defined}
unary operator),
just as in normal text.
If replacement of macros in the preprocessing tokens following the sequence
\tcode{\xname{has_embed} (} and before a matching \tcode{)}
(possibly produced by macro expansion)
encounters a preprocessing token that is one of the \grammarterm{identifier}s
\tcode{limit}, \tcode{prefix}, \tcode{suffix}, or \tcode{if_empty}
and that \grammarterm{identifier} is defined
as a macro\iref{cpp.replace.general}, the program is ill-formed.
If the preprocessing token
\tcode{defined}
is generated as a result of this replacement process
Expand Down Expand Up @@ -910,12 +923,12 @@
\end{example}

\pnum
The \tcode{\#embed} directive is replaced by a comma-delimited list of integer
The \tcode{\#embed} directive is replaced by a comma-separated list of integer
literals of type \tcode{int}, unless otherwise modified by embed
parameters\iref{cpp.embed.param}.

\pnum
The integer literals in the comma-delimited list correspond to
The integer literals in the comma-separated list correspond to
resource-count consecutive calls to \tcode{std::fgetc} \iref{cstdio.syn}
from the resource, as a binary file.
If any call to \tcode{std::fgetc} returns \tcode{EOF}, the program is
Expand Down