c-common.c (c_common_attributes): Add gnu_inline attribyte.

[gcc.git] / gcc / doc / extend.texi

diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi
index 9ec4460bb6ac5cdc2568b0d9c6ef484575df9590..1579b94a9708518b239cb92043d547e3b47eda58 100644 (file)
--- a/gcc/doc/extend.texi
+++ b/gcc/doc/extend.texi
@@ -1581,8 +1581,8 @@ attributes are currently defined for functions on all targets:
 @code{format}, @code{format_arg}, @code{no_instrument_function},
 @code{section}, @code{constructor}, @code{destructor}, @code{used},
 @code{unused}, @code{deprecated}, @code{weak}, @code{malloc},
-@code{alias}, @code{warn_unused_result}, @code{nonnull}
-and @code{externally_visible}.  Several other
+@code{alias}, @code{warn_unused_result}, @code{nonnull},
+@code{gnu_inline} and @code{externally_visible}.  Several other
 attributes are defined for functions on particular target systems.  Other
 attributes, including @code{section} are supported for variables declarations
 (@pxref{Variable Attributes}) and for types (@pxref{Type Attributes}).
@@ -1620,6 +1620,11 @@ Generally, functions are not inlined unless optimization is specified.
 For functions declared inline, this attribute inlines the function even
 if no optimization level was specified.
 
+@item gnu_inline
+@cindex @code{gnu_inline} function attribute
+This attribute on an inline declaration results in the old GNU C89
+inline behavior even in the ISO C99 mode.
+
 @cindex @code{flatten} function attribute
 @item flatten
 Generally, inlining into a function is limited.  For a function marked with
@@ -3802,7 +3807,8 @@ also direct GCC to try to integrate all ``simple enough'' functions
 into their callers with the option @option{-finline-functions}.
 
 GCC implements three different semantics of declaring a function
-inline.  One is available with @option{-std=gnu89}, another when
+inline.  One is available with @option{-std=gnu89} or when @code{gnu_inline}
+attribute is present on all inline declarations, another when
 @option{-std=c99} or @option{-std=gnu99}, and the third is used when
 compiling C++.