On Sep 20, 2014, at 7:54 AM, Martin Costabel <costa...@wanadoo.fr> wrote:
> On 10/09/14 03:08, Daniel Johnson wrote: >> I just installed the Xcode 6 GM on 10.9 and things seem ok except for a >> cosmetic issue. We previously added the flag >> "-Werror=unused-command-line-argument-hard-error-in-future" to >> compiler_wrapper because clang started throwing fits at unused compiler >> flags with clang 5.1. It seems that clang 6.0 no longer cares about this and >> the -Werror=unused-command-line-argument-hard-error-in-future flag itself is >> no longer supported. I submitted a pull request which stops adding said >> option in clang 6 and later here: https://github.com/fink/fink/pull/111. I >> also simplified the version comparison to only compare the first component >> of the version number since things like $clang_version > "600.0.0" don't >> actually work with bash. The ">" only does an ascii comparison and "-gt" >> only does integer. >> >> Please test with older Xcodes to make sure I didn't break anything. > > Since Xcode-6 is now released on 10.9, this becomes urgent. Otherwise apt and > many other packages will no longer build. > > I disagree, however, with your estimate "It seems that clang 6.0 no longer > cares about this". What happened in clang 6 is that we have now arrived in > the "future" promised by the "hard-error-in-future" part of the older flag. > AFAICT, unused command line flags are now errors and can no longer be > downgraded to warnings. This means that the easy way out we chose in xcode-5 > is no longer available, and all packages that have those unused command line > arguments will need to be fixed. I still hope I am wrong, but some little > tests really point in this direction. > > -- > Martin > Hmm, it seems you're right. It looks like clang is inconsistent with how it deals with unknown command line options. For example, if I add '-Willegalflag' to a compile line I just get a warning but '-mno-fused-madd' throws an error. Whee! So the future has indeed arrived. I haven't encountered anything that fails to build yet, but we should definitely keep an eye out. Daniel
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