[gcc r13-7528] Darwin, Objective-C: Support -fconstant-cfstrings [PR108743].

[gcc r13-7528] Darwin, Objective-C: Support -fconstant-cfstrings [PR108743].

[Iain D Sandoe]

https://gcc.gnu.org/g:12897414d309d9cf398259c212923aa7b031a3af

commit r13-7528-g12897414d309d9cf398259c212923aa7b031a3af
Author: Iain Sandoe <iain@sandoe.co.uk>
Date:   Sun Jul 2 14:18:04 2023 +0100

    Darwin, Objective-C: Support -fconstant-cfstrings [PR108743].
    
    This support the -fconstant-cfstrings option as used by clang (and
    expect by some build scripts) as an alias to the target-specific
    -mconstant-cfstrings.
    
    The documentation is also updated to reflect that the 'f' option is
    only available on Darwin, and to add the 'm' option to the Darwin
    section of the invocation text.
    
    Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>
    
            PR target/108743
    
    gcc/ChangeLog:
    
            * config/darwin.opt: Add fconstant-cfstrings alias to
            mconstant-cfstrings.
            * doc/invoke.texi: Amend invocation descriptions to reflect
            that the fconstant-cfstrings is a target-option alias and to
            add the missing mconstant-cfstrings option description to the
            Darwin section.
    
    (cherry picked from commit cdd4b3c0f0f428678c24de74b1f626628450799c)

Diff:
---
 gcc/config/darwin.opt |  4 ++++
 gcc/doc/invoke.texi   | 27 ++++++++++++++++++++-------
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/gcc/config/darwin.opt b/gcc/config/darwin.opt
index feaa95867b5..d655aaef2fb 100644
--- a/gcc/config/darwin.opt
+++ b/gcc/config/darwin.opt
@@ -33,6 +33,10 @@ fapple-kext
 Target C++ Var(flag_apple_kext)
 Generate code for darwin loadable kernel extensions.
 
+fconstant-cfstrings
+ObjC ObjC++ Alias(mconstant-cfstrings)
+Generate compile-time CFString objects.
+
 iframework
 Target RejectNegative C ObjC C++ ObjC++ Joined Separate
 -iframework <dir>	Add <dir> to the end of the system framework include path.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index b61ecfc1bc8..6fe0af4fae8 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -4801,10 +4801,12 @@ and Objective-C++ programs:
 Use @var{class-name} as the name of the class to instantiate for each
 literal string specified with the syntax @code{@@"@dots{}"}.  The default
 class name is @code{NXConstantString} if the GNU runtime is being used, and
-@code{NSConstantString} if the NeXT runtime is being used (see below).  The
-@option{-fconstant-cfstrings} option, if also present, overrides the
-@option{-fconstant-string-class} setting and cause @code{@@"@dots{}"} literals
-to be laid out as constant CoreFoundation strings.
+@code{NSConstantString} if the NeXT runtime is being used (see below).  On
+Darwin (macOS, MacOS X) platforms, the @option{-fconstant-cfstrings} option, if
+also present, overrides the @option{-fconstant-string-class} setting and cause
+@code{@@"@dots{}"} literals to be laid out as constant CoreFoundation strings.
+Note that @option{-fconstant-cfstrings} is an alias for the target-specific
+@option{-mconstant-cfstrings} equivalent.
 
 @opindex fgnu-runtime
 @item -fgnu-runtime
@@ -23947,10 +23949,21 @@ This is by default ON@.
 @item -gfull
 Emit debugging information for all symbols and types.
 
+@opindex fconstant-cfstrings
+@item -fconstant-cfstrings
+The @option{-fconstant-cfstrings} is an alias for @option{-mconstant-cfstrings}.
+
+@opindex mconstant-cfstrings
+@item -mconstant-cfstrings
+When the NeXT runtime is being used (the default on these systems), override
+any @option{-fconstant-string-class} setting and cause @code{@@"@dots{}"}
+literals to be laid out as constant CoreFoundation strings.
+
+@opindex mmacosx-version-min
 @item -mmacosx-version-min=@var{version}
-The earliest version of MacOS X that this executable will run on
-is @var{version}.  Typical values of @var{version} include @code{10.1},
-@code{10.2}, and @code{10.3.9}.
+The earliest version of MacOS X that this executable will run on is
+@var{version}.  Typical values supported for @var{version} include @code{12},
+@code{10.12}, and @code{10.5.8}.
 
 If the compiler was built to use the system's headers by default,
 then the default for this option is the system version on which the