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P3868R1 Allow #line before module declarations #8493

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P3868R1 Allow #line before module declarations #8493

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df66f73
P3868R1 Allow #line before module declarations
jensmaurer Nov 9, 2025
cd2d1ee
fixup: grammar for line-directive
jensmaurer Nov 11, 2025
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14 changes: 12 additions & 2 deletions source/preprocessor.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@

\begin{bnf}
\nontermdef{module-file}\br
\opt{pp-global-module-fragment} pp-module \opt{group} \opt{pp-private-module-fragment}
\opt{line-directives} \opt{pp-global-module-fragment} pp-module \opt{group} \opt{pp-private-module-fragment}
\end{bnf}

\begin{bnf}
Expand Down Expand Up @@ -55,13 +55,18 @@
\terminal{\# define } identifier lparen \terminal{... )} replacement-list new-line\br
\terminal{\# define } identifier lparen identifier-list \terminal{, ... )} replacement-list new-line\br
\terminal{\# undef \ } identifier new-line\br
\terminal{\# line \ \ } pp-tokens new-line\br
line-directive\br
\terminal{\# error \ } \opt{pp-tokens} new-line\br
\terminal{\# warning} \opt{pp-tokens} new-line\br
\terminal{\# pragma } \opt{pp-tokens} new-line\br
\terminal{\# }new-line
\end{bnf}

\begin{bnf}
\nontermdef{line-directives}\br
line-directive \opt{line-directives}
\end{bnf}

\begin{bnf}
\nontermdef{if-section}\br
if-group \opt{elif-groups} \opt{else-group} endif-line
Expand Down Expand Up @@ -2070,6 +2075,11 @@
\indextext{preprocessing directive!line control}%
\indextext{\idxcode{\#line}|see{preprocessing directive, line control}}

\begin{bnf}
\nontermdef{line-directive}\br
\terminal{\# line} pp-tokens new-line
\end{bnf}

\pnum
The \grammarterm{string-literal} of a
\tcode{\#line}
Expand Down