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| author | Richard Henderson <rth@redhat.com> | 2005-03-17 03:55:49 -0800 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2005-03-17 03:55:49 -0800 |
| commit | 52eb57dfb1a459af58f87e8dc71206d7c2ba36a8 (patch) | |
| tree | 1f0c9ba60dc7c35a75419cd6b7f084d79b52e4a7 /gcc | |
| parent | 8bea7f7c10c6157c58f3f9e197a14b0964b1bce7 (diff) | |
| download | gcc-52eb57dfb1a459af58f87e8dc71206d7c2ba36a8.zip gcc-52eb57dfb1a459af58f87e8dc71206d7c2ba36a8.tar.gz gcc-52eb57dfb1a459af58f87e8dc71206d7c2ba36a8.tar.bz2 | |
extend.texi (Weak Pragmas): New section.
* doc/extend.texi (Weak Pragmas): New section.
(attribute alias): Clarify that target must be in the same
translation unit.
From-SVN: r96603
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 28 |
2 files changed, 32 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 65a6616..262674f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,5 +1,11 @@ 2005-03-17 Richard Henderson <rth@redhat.com> + * doc/extend.texi (Weak Pragmas): New section. + (attribute alias): Clarify that target must be in the same + translation unit. + +2005-03-17 Richard Henderson <rth@redhat.com> + * config/alpha/alpha.opt: New file. * config/alpha/alpha.c (alpha_tune): New. Rename all existing uses of alpha_cpu. diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 84349f3..057bdfa 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -1528,7 +1528,8 @@ void f () __attribute__ ((weak, alias ("__f"))); @end smallexample declares @samp{f} to be a weak alias for @samp{__f}. In C++, the -mangled name for the target must be used. +mangled name for the target must be used. It is an error if @samp{__f} +is not defined in the same translation unit. Not all target machines support this attribute. @@ -8579,6 +8580,7 @@ for further explanation. * Solaris Pragmas:: * Symbol-Renaming Pragmas:: * Structure-Packing Pragmas:: +* Weak Pragmas:: @end menu @node ARM Pragmas @@ -8761,7 +8763,7 @@ way of knowing that that happened.) @node Structure-Packing Pragmas @subsection Structure-Packing Pragmas -For compatibility with Win32, GCC supports as set of @code{#pragma} +For compatibility with Win32, GCC supports a set of @code{#pragma} directives which change the maximum alignment of members of structures, unions, and classes subsequently defined. The @var{n} value below always is required to be a small power of two and specifies the new alignment @@ -8782,6 +8784,28 @@ multiple @code{#pragma pack(@var{n})} instances and finalized by a single @code{#pragma pack(pop)}. @end enumerate +@node Weak Pragmas +@subsection Weak Pragmas + +For compatibility with SVR4, GCC supports a set of @code{#pragma} +directives for declaring symbols to be weak, and defining weak +aliases. + +@table @code +@item #pragma weak @var{symbol} +@cindex pragma, weak +This pragma declares @var{symbol} to be weak, as if the declaration +had the attribute of the same name. The pragma may appear before +or after the declaration of @var{symbol}, but must appear before +either its first use or its definition. It is not an error for +@var{symbol} to never be defined at all. + +@item #pragma weak @var{symbol1} = @var{symbol2} +This pragma declares @var{symbol1} to be a weak alias of @var{symbol2}. +It is an error if @var{symbol2} is not defined in the current +translation unit. +@end table + @node Unnamed Fields @section Unnamed struct/union fields within structs/unions @cindex struct |