https://gcc.gnu.org/g:4c708fa411fa708e7abc717b0880d6f708967a37
commit r15-9140-g4c708fa411fa708e7abc717b0880d6f708967a37
Author: Sandra Loosemore <sloosem...@baylibre.com>
Date: Tue Apr 1 23:10:16 2025 +0000
Doc: Document _Bool type as C90 extension [PR118118]
gcc/ChangeLog
PR c/118118
* doc/extend.texi (Boolean Type): New section.
Diff:
---
gcc/doc/extend.texi | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 76fb210060da..d2bf6048be78 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -12944,6 +12944,7 @@ C and/or C++ standards, while others remain specific to
GNU C.
* Offsetof:: Special syntax for @code{offsetof}.
* Alignment:: Determining the alignment of a function, type or
variable.
* Enum Extensions:: Forward declarations and specifying the underlying
type.
+* Boolean Type:: Support for the @code{_Bool} keyword.
* Variadic Macros:: Macros with a variable number of arguments.
* Conditionals:: Omitting the middle operand of a @samp{?:} expression.
* Case Ranges:: `case 1 ... 9' and such.
@@ -13698,6 +13699,17 @@ Forward-declaring an incomplete enum type without an
explicit
underlying type is supported as an extension in all GNU C dialects,
but is not supported at all in GNU C++.
+@node Boolean Type
+@subsection Support for the @code{_Bool} Type
+@cindex boolean type
+@cindex @code{_Bool} keyword
+
+The C99 standard added @code{_Bool} as a C language keyword naming the
+boolean type. As an extension, GNU C also recognizes @code{_Bool} in
+C90 mode as well as with @option{-std=c99} and later.
+
+GNU C++ does not support the @code{_Bool} keyword.
+
@node Variadic Macros
@subsection Macros with a Variable Number of Arguments.
@cindex variable number of arguments
