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| author | Jonathan Wakely <jwakely@redhat.com> | 2023-04-27 12:02:38 +0100 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2023-05-17 13:58:58 +0100 |
| commit | d8a656d5b6246457e84934bc35115c134bc38def (patch) | |
| tree | 0d1336f8c7d871cb97ffab8553ac75dcfa0249f3 | |
| parent | 80bb0b8a81fdc5d0a1c88ae3febd593868daa752 (diff) | |
| download | gcc-d8a656d5b6246457e84934bc35115c134bc38def.tar.gz | |
doc: Describe behaviour of enums with fixed underlying type [PR109532]
gcc/ChangeLog:
PR c++/109532
* doc/invoke.texi (Code Gen Options): Note that -fshort-enums
is ignored for a fixed underlying type.
(C++ Dialect Options): Likewise for -fstrict-enums.
Reviewed-by: Marek Polacek <polacek@redhat.com>
| -rw-r--r-- | gcc/doc/invoke.texi | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 2c525762171..ee78591c73e 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -3495,6 +3495,8 @@ defined in the C++ standard; basically, a value that can be represented in the minimum number of bits needed to represent all the enumerators). This assumption may not be valid if the program uses a cast to convert an arbitrary integer value to the enumerated type. +This option has no effect for an enumeration type with a fixed underlying +type. @opindex fstrong-eval-order @item -fstrong-eval-order @@ -18306,6 +18308,8 @@ Use it to conform to a non-default application binary interface. Allocate to an @code{enum} type only as many bytes as it needs for the declared range of possible values. Specifically, the @code{enum} type is equivalent to the smallest integer type that has enough room. +This option has no effect for an enumeration type with a fixed underlying +type. @strong{Warning:} the @option{-fshort-enums} switch causes GCC to generate code that is not binary compatible with code generated without that switch. |