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annotate mupdf-source/thirdparty/curl/docs/libcurl/ABI @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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b50eed0cc0ef ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4.
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1 ABI - Application Binary Interface
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2 ==================================
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4 "ABI" describes the low-level interface between an application program and a
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5 library. Calling conventions, function arguments, return values, struct
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6 sizes/defines and more.
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8 [Wikipedia has a longer description](https://en.wikipedia.org/wiki/Application_binary_interface)
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10 Upgrades
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11 --------
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13 In the vast majority of all cases, a typical libcurl upgrade does not break
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14 the ABI at all. Your application can remain using libcurl just as before,
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15 only with less bugs and possibly with added new features. You need to read
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16 the release notes, and if they mention an ABI break/soname bump, you may have
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17 to verify that your application still builds fine and uses libcurl as it now
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18 is defined to work.
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20 Version Numbers
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21 ---------------
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23 In libcurl land, you really can't tell by the libcurl version number if that
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24 libcurl is binary compatible or not with another libcurl version.
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26 Soname Bumps
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27 ------------
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29 Whenever there are changes done to the library that will cause an ABI
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30 breakage, that may require your application to get attention or possibly be
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31 changed to adhere to new things, we will bump the soname. Then the library
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32 will get a different output name and thus can in fact be installed in
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33 parallel with an older installed lib (on most systems). Thus, old
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34 applications built against the previous ABI version will remain working and
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35 using the older lib, while newer applications build and use the newer one.
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37 During the first seven years of libcurl releases, there have only been four
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38 ABI breakages.
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40 We are determined to bump the SONAME as rarely as possible. Ideally, we
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41 never do it again.
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43 Downgrades
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44 ----------
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46 Going to an older libcurl version from one you're currently using can be a
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47 tricky thing. Mostly we add features and options to newer libcurls as that
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48 won't break ABI or hamper existing applications. This has the implication
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49 that going backwards may get you in a situation where you pick a libcurl that
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50 doesn't support the options your application needs. Or possibly you even
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51 downgrade so far so you cross an ABI break border and thus a different
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52 soname, and then your application may need to adapt to the modified ABI.
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54 History
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55 -------
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57 The previous major library soname number bumps (breaking backwards
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58 compatibility) have happened the following times:
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60 0 - libcurl 7.1, August 2000
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62 1 - libcurl 7.5 December 2000
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64 2 - libcurl 7.7 March 2001
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66 3 - libcurl 7.12.0 June 2004
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68 4 - libcurl 7.16.0 October 2006