[gcc r14-4404] ipa/111643 - clarify flatten attribute documentation

[Richard Biener]

https://gcc.gnu.org/g:ffbd7c3d0fd1b9b10ef5a0f2b2e64bd234620167

commit r14-4404-gffbd7c3d0fd1b9b10ef5a0f2b2e64bd234620167
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Oct 4 11:19:10 2023 +0200

    ipa/111643 - clarify flatten attribute documentation
    
    The following clarifies the flatten attribute documentation to mention
    the inlining applies also to calls formed as part of inlining earlier
    calls but not calls to the function itself.
    
            PR ipa/111643
            * doc/extend.texi (attribute flatten): Clarify.

Diff:
---
 gcc/doc/extend.texi | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index b4770f1a149..645c76f23e9 100644
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -3109,7 +3109,9 @@ file descriptor opened with @code{O_RDONLY}.
 @cindex @code{flatten} function attribute
 @item flatten
 Generally, inlining into a function is limited.  For a function marked with
-this attribute, every call inside this function is inlined, if possible.
+this attribute, every call inside this function is inlined including the
+calls such inlining introduces to the function (but not recursive calls
+to the function itself), if possible.
 Functions declared with attribute @code{noinline} and similar are not
 inlined.  Whether the function itself is considered for inlining depends
 on its size and the current inlining parameters.