It seems sane, and you should update corebase's autoconf to detect presence of
this compiler built-in.
That is: an installed header should be generated and contain a constant
describing whether CFStringMake...() is present.
On June 27, 2017 5:32:04 PM GMT+01:00, "Daniel Ferreira (theiostream)"
<bnm...@gmail.com> wrote:
>Hi,
>
>I'm currently working on developing a CoreFoundation-based library
>with CoreBase, and I just realized that unlike in OSX, CFSTR() does
>not generate a compile-time CFStringRef constant.
>
>This is fine compatibility-wise since CFSTR() does not guarantee that
>it will do so -- in fact, Apple's own CoreFoundation headers check if
>we are on Linux and if that is the case, it does not enable this
>compile-time feature.
>
>However, as far as my (extremely brief) investigation went we can
>generate compile-time CFStringRefs using
>__builtin___CFStringMakeConstantString(), which is present since this
>gcc commit[1] and since forever in clang. So it makes sense to me that
>this should not be platform-dependent, but rather compiler-dependent.
>
>This helps because I need to export some CFStringRefs as symbols in a
>new lib for WebKit compatibility, and without this feature I'd be left
>with the option to either:
>a) create an Objective-C file in a C-only library just for exporting
>NSStrings;
>b) make a bizarre __attribute__((constructor))-like thing to
>initialize the constant strings onto the symbols on library load.
>
>Does this seem sane? If so, I need a tip in how to guard for this
>builtin in gcc.
>
>-- Daniel.
>
>[1]:
>https://github.com/gcc-mirror/gcc/commit/d4238e8bcce578381de9480d78a651830a8f9754,
>looks like it was added in gcc 5.3.
>
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