Closed Bug 711683 Opened 11 years ago Closed 11 years ago
Use Clang's feature-detection macros for feature testing, not its "marketing" version numbers
Skimming Clang mailing list traffic tonight, I discovered that vendors are seemingly intent on muddying the waters by disconnecting Clang version numbers from feature sets -- good times. So relying on version checks for features is a bit dodgy. Conveniently Clang provides feature detection macros which will do the same work, arguably more clearly. Whee, kinda-make-work. The warning about version checking is here, for the major/minor macros: http://clang.llvm.org/docs/LanguageExtensions.html#builtinmacros The patch uses the __has_extension macro because we want to use the relevant language features even if we're not compiling plain old C++98 -- no reason to hold back use of these features for a full transition over. __has_extension is documented here: http://clang.llvm.org/docs/LanguageExtensions.html#__has_feature_extension The arguments passed to __has_extension are documented here: http://clang.llvm.org/docs/LanguageExtensions.html#cxx_deleted_functions http://clang.llvm.org/docs/LanguageExtensions.html#cxx_override_control I checked some .i files with this patch, and things translate as expected in a Clang compile.
Attachment #582471 - Flags: review?(jones.chris.g)
Component: General → MFBT
QA Contact: general → mfbt
11 years ago
Attachment #582471 - Flags: review?(jones.chris.g) → review+
Target Milestone: --- → mozilla11
Status: ASSIGNED → RESOLVED
Closed: 11 years ago
Resolution: --- → FIXED
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