https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78352
Bug ID: 78352
Summary: GCC lacks support for the Apple "blocks" extension to
the C family of languages
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: egall at gwmail dot gwu.edu
Target Milestone: ---
In bug 78267 Iain suggested to open a separate bug for the issue of missing
Apple-blocks support in FSF GCC, so that's what this bug is. Here is an example
of code that is currently rejected due to lack of support for this feature:
typedef void (^os_trace_payload_t)(xpc_object_t xdict);
In Apple's gcc and clang, support for blocks can be enabled with the -fblocks
flag, and can be detected by the presence of the __BLOCKS__ preprocessor macro.
This extension applies to all members of the C family: C, C++, Objective C, and
Objective C++.
Further information:
https://gcc.gnu.org/ml/gcc/2009-09/msg00277.html (and the rest of the thread)
https://gcc.gnu.org/ml/gcc/2013-11/msg00039.html (likewise, & rest of thread)
Bug 63651
http://clang.llvm.org/docs/BlockLanguageSpec.html
http://clang.llvm.org/docs/Block-ABI-Apple.html
http://www.open-std.org/JTC1/sc22/wg14/www/docs/n1370.pdf
https://en.wikipedia.org/wiki/Blocks_%28C_language_extension%29
