February 2022 - Darwin-dev - lists.apple.com

Re: On the availability of "--exclude-libs" like functionality in ld64
by Francesco Pretto via Darwin-dev 21 Feb '22

21 Feb '22

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=+rphtMTJuKPIQjwAa9OdLRz19xOobmo2FUm7WYGXe7o=; b=j2DTIFrJ8G22/d9bTYIBynxY1mJYwhte9mLWCbQNazIkWWg7nL/F8W/Dd4Nl7kgWPS gAmWQPWt7Ar19W4f7LlZA0Uo9n9YfySi4gDh1mDTFMF4Xu2LnCL0xzzXxuztzweihZAp qL/6PB8y6GRk4366TE/5MMuaX3OrEJB3V+1feXae/WmWvr8wZMeMHqTQb8U2faQnsDWZ GdTXXnR8AjPOGarfQLJyrMB9telcVrA4NNYAjgCVudptgdWzQRHHvN00bRGFE4jX9hDU P1z+oZv2bxtQL3yFesCCNtlId3alJtbmqLhjbyCIsr1We2gtv5R0S5nMcKbDd0CDB3/x JqWw== Dear Axel, yes, definitely, ant it's recent enough since it looks like it was not available in XCode11. It has a different semantics, since this mean that one has to specify all the "hidden" libraries, and possibly the "-hidden-lx" has to used instead of "-lx", for example "-hidden-lssl" instead of "-lss"[1]. In a sense, the "--exclude-libs" semantics still looks more appealing, since it doesn't require changes to an existing build infrastructure (think of CMake/autotools controlled build), and a different behavior can be enforced by patching linker flags (also the wildcard "ALL" in --exclude-libs is useful). Will "-hidden-lx" work also with multiple conflicting switches, like the last switch in the command line wins (similarly to compilation flags)? Cheers, Francesco [1] https://stackoverflow.com/a/70425525/213871 On Mon, 21 Feb 2022 at 14:05, Axel Lüttgens via Darwin-dev <darwin-dev(a)lists.apple.com> wrote: > > Hello Francesco, > > Could option "-hidden-lx" of ld be of some help? > > Axel > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/darwin-dev/ceztko%40gmail.com > > This email sent to ceztko(a)gmail.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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Re: On the availability of "--exclude-libs" like functionality in ld64
by Axel Lüttgens via Darwin-dev 21 Feb '22

21 Feb '22

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=simple/simple; d=skynet.be; i=(a)skynet.be; q=dns/txt; s=rmail; t=1645448727; x=1676984727; h=from:content-transfer-encoding:mime-version:subject:date: references:to:in-reply-to:message-id; bh=zlGhI06Wjs3QxBilby2KdPKHjUjviGFKXk1k4U4tr1s=; b=IiA6Sk16fO/PW0xBM4PZwuwUy2HnsVuw+jWNvxCjBlhkH0f0fk55KCOx GumezDM/g4xeR708qW7eQUT9DRVJVAU5XbRj7BzToj8oUpRyjgQeJhCuq 5od1bQus1o8tGnLaR9vvPVqggsD9ga7hHobDmt/T2FFDIAeBCTRzZa0au I=; Ironport-data: A9a23:lsfcya9/c3jrebYtSWYFDrUDLXyTJUtcMsCJ2f8bNWPcYEJGY0x3y mcWXm6OPKzfZmanKo1zYITnphsP7J+DytMySgtlqClEQiMRo6IpJzg5wmQcns+2BpeeJK6yx 5xGMrEsFOhtEjmE4E7F3oHJ9RGQ74nRLlbHILOCanAZqTNMEn9700o5wbdh2+aEvPDga++zk YKqyyHgEAL9s9JEGjp8B3Wr8U4HUFza4Vv0j3RmDRx5lAa2e0o9UPrzEZqMw07QGeG4KAIVq 9Hrl9lV9kuBl/sk50jMfrzTKiXmSZaKVeSCZ+Y/t6WK2nB/SiIOPqkTbPUzaHlLqzSzxNVJl IlOu8S3Tl4uIfiZ8Agde0Ew/yBWJqha4LTDIHW5rYqa11XCfhMAwd0+VQdsYdBeob8xWDgRn RAbAGllghSrjvK7xPS/V/VwicklN+HwP5IZt20mxzyx4fMOGMuZGPuTu4IFtNs2rvJQAan0S s0QU2t2cU7FZj9yA1cIDbtryY9EgVG6KVW0smm9qaMt/GnViQB8zpDpMcHJYZqDXd1RkwCTo WeuwojiKkhDa5rEkH/fri/p1raJlC/gXMceBbv+9+VyxleewmMaAxoTE1G2yRWktnODtxtkA xR80kITQWIarSRHkvGVs9aETLJoc/LStxe80wH31e1V9pfp3g== Ironport-hdrordr: A9a23:K+x9va4vz1oCl5C4ywPXwBHXdLJyesId70hD6qkRc20pTiX8ra uTdZsgtCMc9wxhPk3I9ertBEDCewKkyXcN2/hrAV76ZnidhILKFvAf0WKB+V3d8kTFn4Y26U 4HScdD4bbLYGSS4/yV3OHEe+xQuOVvJJrY59s3sx9WPGZXgtlbnmRE4/GgYylLraB9dP8EKK Y= Ironport-phdr: A9a23:eP5o/B/KZCUY2/9uWS28ngc9DxPPW53KNwIYoqAql6hJOvz6uci4Z gqPu74x1xfgZsby07p8ke3YsqTtCyQrwK2qlzQ8SqFKTAIPks4MngYtU4avAEz/K+P2PWRhR JwRHFBq8GumPkdLBc3we0PdomGo7T4VBx7zKRd5Kv76F4LMkci7zeO/9pzcbwhHije2fK9/I gixoQjNrMcdnJFsKrw2yhvHo3tIf/pZyGZ1Ll+NnBjy+9m98od7/ytfp/wu+chAUb7nf6sjV rxXEC4mM2Eu68L1sxTIUBaC6WEdUmUSlRpIHhTF4RTnVZr/rif2quxw0zScMMbrT747RC6i4 r9rRhD0hykIOCM3/m/ZisJujq1VoxWvqgdjw4PWZYGZKPp+cr/Dcd4cWGFPXtxRVytEAo6kc 4YOAPQOPeJAoIf7u0MOsQe+BQayC+Pp0T9Dm3j70rc10us/FQHKxgggH88SsHTIo9X6KqESU fuuwanTzjXCb/VW1inh6ITSaR8uv+iBULRtesXe1UchDRnKjkmMqYP7JTOV0PwAvmiU4uZ9V u+hhG4ppxxsrjWz2MoglJXEi4wIxl3L9ih0wZg5KMC8RUB1b9CpFIdduz+UOYV5Qc4vXnxkt DskxrAApJW1fzAKxYwkyhLCcfCLbYeF7xL5WOufPDt0nm9pdK+9ihu07EOu0PfzVtOu31ZPt idFl97MuW0T2BHL8ciHT+d9/l+m2TaSywDf8uFELl4wlarcM5Mh2bswloYLsUvfGi/2mVv5j KmKdkk+4Oeo8/znYrH4qZOENo90jB/xMrg2l8G8HOg0KBYCUmeb9Oim2rDv4Ff1TKhXgvA0i qXZtYrVJcUfpq63GQ9V1YMj5g6lADapztsYmWMLLFZYeBKbk4jpNE/BIPbjDfqkmFSskzdqx /bYMb39GJnCNWbMnK/nfblm80Fc0hY8zchD55JIDbEMOO//VlfrtNPEFh85LxC0w+H/Bdpgz IweQ2yOAq6fMK/LrFCH+PwvLvKIZI8Uozb9N+Ml6+T0gn8hgV8debem0YELZ3C/G/Q1a3meN HbgyoMNGH0Vvwx7QOH0oFmDSiJIIX+qR6YxoDo8DdT1I53EQ9WEkLGF6wMvAoFZa2ZdQgSFA XrsMYGZR+sDZSSJCtRigzoJSf6rRtlyhlmVqAbmxu8/faLv8SoCuMe7vOU= Hello Francesco, Could option "-hidden-lx" of ld be of some help? Axel _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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On the availability of "--exclude-libs" like functionality in ld64
by Francesco Pretto via Darwin-dev 21 Feb '22

21 Feb '22

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=FL+o6+MsdKOl36ferKevCL0BVl7jtsFs0JDHTw2JDaw=; b=EwvENVuC3+ylu6fGSqAVz564mJi4I0hgp7oM4W2ZhVyJq3qQb2EXQ6BdtxbVOAp5f4 RSScTwZWK5YfFlVCI651MXXs7IQn91FRXQ+8qsiJ8TwDhL4gNtpdWzqIA6uzpyMl0clB xz9nkqWboMccRAMvgBZYUDq47/eXUFIH3nSXNOhqSiPIt3pby9PAoG8z9hluo7gusO6n 1t3q6tSVkn3xrM5e1IovGCIa9P5nR8LzNvxwdQdkeCJXcYvGNuc825uB5hdYefdLueS/ KUJpRRJAGyBMnlfPlHGA+wQxpGFd8IGZ9HjUA6uwCgG/5RSBwxYmT0ud31QPf0c73xEE kpBQ== Hello, I'm writing to darwin-dev since I was unable to find a more suitable list discussing specific apple clang/ld64 topics, but please point me out if this is not the right place for this topic and where I should ask instead. When developing cross platform software and targeting apple platforms, I noticed that the official apple linker (ld64) apparently doesn't offer an equivalent functionality of the "--exclude-libs" switch in gcc[1] and lld[2]. When creating a shared library, the --exclude-libs switch allows to exclude exporting symbols from a list of linked libraries, with the option to exclude all of them with the "ALL" wildcard. This switch is very convenient when building a complex project with a lot of static compiled 3rd party dependencies. These dependencies may in fact contain a lot of symbols intentionally marked with default visibility, __attribute__((visibility("default"))), or the symbols are manually exported through assembly code, even when the library is actually compiled statically. In these cases, compiling the libraries enforcing the -fvisibility=hidden compilation flag is not enough to prevent these symbols from being exported when linking into the final .so/.dylib, and patching source is necessary to avoid exporting unnecessary symbols that can be erroneously bound by software in the same process performing reckless dynamic symbols loading. The --exclude-libs switch is very convenient as it basically allows to drop all these symbols unconditionally from the linked libraries, not requiring to patch 3rd party source. Is the same functionality available in ld64 with a different name/semantics? If not, do you plan to implement it in a future release of ld64? Kind regards, Francesco [1] https://sourceware.org/binutils/docs/ld/Options.html#index-_002d_002dexclud… [2] https://reviews.llvm.org/D34422 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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(Reminder)How do Practitioners Approach towards Requirements Engineering?
by ETEM ÇETİN TOPTANİ via Darwin-dev 17 Feb '22

17 Feb '22

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yeditepe.edu.tr; s=google; h=mime-version:from:date:message-id:subject:to; bh=qvo5LSYapgnnJgqWazixtQ5sXnQxgWTDCEkVK3PX6Dk=; b=LEaGRC/ZnxQVrL6DQoFewZiFKMT1p2Y2hCv6iFmao6fj9TdxFqzoB5v1598/vy+eAW /sTA86ceYaQVbIlvRrd3Ky3W5k5YI1RaiZlS6acqsd0BU7mqO4q9cA6oAOMDOd+B9cdP uudAMomfDXOeJkXM7Ux79+Ar0rCHV09dvFXLBv8wNfEZIZlJnHxLSGGfZYi8g0mIk5w/ olEqOxon+m9nn/D3bgVkEwsSjviMS/SSSQFkqo7FdO6jU+HwsEi+bdUQbAuIuLW/v+b0 V5ACHNxW1zEkFxGrW7L8RXLLuVGzsuuGGILqiHyhTUqTXXKMBIPp2re9+N7pkdTCBgGZ WjFQ== Dear Sir or Madam, We prepared a short survey to understand practitioners’ perspectives towards the requirements engineering. Our survey basically aims to clarify on many aspects of the requirements engineering applied in industry, including (i) requirements gathering and specifications, (ii) requirements modifications, (iii) requirements analysis, and (iv) requirements transformation. We will use the results to publish a journal paper on the practitioners' perspectives towards requirements engineering The survey takes about 2-7 minutes to participate. We will be so grateful if you can separate just a few minutes of you. Also, please circulate the email to anyone who may be interested. The survey link: https://forms.gle/DhLqr15GXVhJhzzy6 All the best, Etem Çetin Toptani -- *Bu mesajı yazdırmadan önce çevreye verebileceğiniz zararları bir kez daha düşününüz. * *Think of the environment once more before printing out this message.* -- *Bu mesajı yazdırmadan önce çevreye verebileceğiniz zararları bir kez daha düşününüz. * *Think of the environment once more before printing out this message.* _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.ap… This email sent to site_archiver(a)lists.apple.com

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