ARC restriction errors even with -fno-objc-arc

[schell]

It seems I'm getting ARC restriction errors even when the files involved are being compiled with -fno-objc-arc. I'm guessing some other related files also need to be compiled with -fno-objc-arc.

[schell]

No - that doesn't seem to solve the problem.

[ExoticObjects]

Theses same issues came up for me after switching to Cocoapods 0.37. I'd previously been using 0.35.1 because of this bug. Apparently that bug is fixed, but cocoapods still doesn't play nicely with handlebars-objc. @Bertrand - any ideas?

[ExoticObjects]

I've created the simplest possible project with handlebars-objc and cocoapods 0.37.0 and it fails. So this is a legitimate problem.

See here. Hopefully someone will have some ideas...

[guillaumealgis]

This is because Cocoapods apply the -fno-objc-arc flag (and others) on a file by file basis in Xcode instead of setting a global compiler flag for the whole target.
As some objc files are generated while compiling (by yacc and lex) these cannot have the flags applied in Xcode beforehand.

A solution is to add the flags added by Cocoapods (eg -fno-objc-arc -w -Xanalyzer -analyzer-disable-checker -Xanalyzer deadcode) in "Other C Flags" for the whole handlebars-objc target.

Please note however that these will be removed after each pod install.

[Bertrand]

Hello,

sorry, I’m busy working on another project right now, but I will look into this as soon as I can.

— bertrand.

On 05 May 2015, at 17:36, Exotic Objects notifications@github.com wrote:

I've created the simplest possible project with handlebars-objc and cocoapods 0.37.0 and it fails. So this is a legitimate problem.

See here https://github.com/ExoticObjects/test_handlebars_w_cocoapods/tree/master. Hopefully someone will have some ideas...

—
Reply to this email directly or view it on GitHub #15 (comment).

[ExoticObjects]

@guillaume-algis - will pod update also remove them? Or just pod install?

Also, thanks for taking the time to make a screenshot :-)

[ExoticObjects]

Great fix, but as you said - temporary. pod update also clears these flags.

Still, it's nice to have a workaround until this is addressed. Thanks again.

[schell]

Yes, thank you for that work around, nice sleuthing. 👍

[ExoticObjects]

@guillaume-algis - do you think it would be possible to use a post_install script to re-add these flags after pod install runs?

Something like this.

It makes sense to me conceptually, but I'm not sure which files would need altering. After adding the flags you recommended, I don't see them in any of the xcconfig files...

[guillaumealgis]

They are added in the Pod-handlebars-objc.xcodeproj/project.pbxproj file. But it could be possible to add them in the xcconfig instead.
Anyway, this is a rather ugly fix IMO, I'd much prefer fixing the bug upstream in Cocoapods.

But until the bug is addressed in Cocoapods, yes it should probably work.

[ExoticObjects]

I don't have a Pod-handlebars-objc.xcodeproj file in my test project.

I just have a top level .xcodeproj and a Pods.xcodeproj, and neither of them have the -fno-objc-arc -w -Xanalyzer -analyzer-disable-checker -Xanalyzer deadcode flags in them. (I've set the flags in XCode)

Am I missing something?

Also, this bug (or issue) has existed in Cocoapods for a long time. I'm not holding my breath for them to address it. So a hacky script might be a good thing to have around...

[ExoticObjects]

Oops, they are there like you said. In Pods.xcodeproj - thanks.

[guillaumealgis]

Also, this bug (or issue) has existed in Cocoapods for a long time. I'm not holding my breath for them to address it. So a hacky script might be a good thing to have around...

That's the beauty of open source: you can fix it yourself and open a PR ;)

[ExoticObjects]

After looking into Cocoapods XCodeproj, I decided to write a cocoapods post_install hook to re-add these flags after pod install (or update) runs. I'd initially thought that it would need to be a real hackjob, but the XCodeproj library is sensible and powerful. So this seems like (maybe) a semi-legit way to deal with the problem? I've tested it in two projects and it works.

Basically, it lets me run the latest version of Cocoapods (0.37.0) while using handlebars-objc. But it should be pretty good at setting any build settings that you might need to modify. Hopefully it will help someone out...

Here's the git repo for the script.