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Restructure -Wno-narrowing documentation

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* doc/invoke.texi (-Wno-narrowing): Reorder so default behavior is
	covered first.

From-SVN: r246513
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Jonathan Wakely 2017-03-27 23:00:45 +01:00 committed by Jonathan Wakely
parent a9e4a1a56f
commit 7810f87a47
2 changed files with 14 additions and 10 deletions
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@ -1,3 +1,8 @@
2017-03-27 Jonathan Wakely <jwakely@redhat.com>
* doc/invoke.texi (-Wno-narrowing): Reorder so default behavior is
covered first.
2017-03-27 Jakub Jelinek <jakub@redhat.com>
PR target/80102

19
gcc/doc/invoke.texi
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@ -2869,10 +2869,17 @@ During the link-time optimization warn about type mismatches in
global declarations from different compilation units.
Requires @option{-flto} to be enabled. Enabled by default.
@item -Wnarrowing @r{(C++ and Objective-C++ only)}
@item -Wno-narrowing @r{(C++ and Objective-C++ only)}
@opindex Wnarrowing
@opindex Wno-narrowing
With @option{-std=gnu++98} or @option{-std=c++98}, warn when a narrowing
For C++11 and later standards, narrowing conversions are diagnosed by default,
as required by the standard. A narrowing conversion from a constant produces
an error, and a narrowing conversion from a non-constant produces a warning,
but @option{-Wno-narrowing} suppresses the diagnostic.
Note that this does not affect the meaning of well-formed code;
narrowing conversions are still considered ill-formed in SFINAE contexts.
With @option{-Wnarrowing} in C++98, warn when a narrowing
conversion prohibited by C++11 occurs within
@samp{@{ @}}, e.g.
@ -2882,14 +2889,6 @@ int i = @{ 2.2 @}; // error: narrowing from double to int
This flag is included in @option{-Wall} and @option{-Wc++11-compat}.
When a later standard is in effect, e.g. when using @option{-std=c++11},
narrowing conversions are diagnosed by default, as required by the standard.
A narrowing conversion from a constant produces an error,
and a narrowing conversion from a non-constant produces a warning,
but @option{-Wno-narrowing} suppresses the diagnostic.
Note that this does not affect the meaning of well-formed code;
narrowing conversions are still considered ill-formed in SFINAE contexts.
@item -Wnoexcept @r{(C++ and Objective-C++ only)}
@opindex Wnoexcept
@opindex Wno-noexcept