426ec3543a
syncevolution.org binaries are now getting compiled on Ubuntu Trusty and thus no longer support distros with older EDS. The code should still compile against older EDS (for example, for Maemo), but that is not getting tested anymore. This allows removing the dynamic linker hacks related to older libraries, which was only used in those binaries. Instead, backends using libical or EDS get compiled on Ubuntu Trusty and then the soname of those libs get patched to make the backend module usable in combination with a different set of libs. That patching is part of a script maintained in the syncevolution.org build infrastructure. This approach was already used before to generate different EDS backends for EDS versions with the newer EClient API, because that turned out to be easier than the dynamic loading approach. It works because none of the methods used by SyncEvolution changed their ABI, only some other parts of the libraries did. Should there ever be a situation again that cannot be handled like this, then backends might also get compiled on different distros than Ubuntu Trusty (however, that may lead to problems due to the libstdc++ ABI changes - to be decided...). libical still requires one special hack: system time zone loading in libical v1 (and only in that version, v2 has builtin support again) must be overridden such that time zones are generated with rules instead of transitions because that is more compatible with the peers that SyncEvolution exchanges data with. That hack now relies on overriding the two relevant functions inside the main binaries (has to be there, otherwise libical still ends up calling its own internal implementation). The overriding code is in libsyncevo-icaltz-util.so.0 and depends on libical.so.1. If libsyncevo-icaltz-util.so.0 can be loaded, the wrappers in the main binary use it, otherwise they fall through to the code from the current libical.so, which then should be libical.so.2 or more recent. This hack is active by default when libical v1 is detected during configuration.
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#define _GNU_SOURCE 1
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#include <dlfcn.h>
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static void *(*icaltimezone_get_component_p)(void *zone);
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static void *(*icaltzutil_fetch_timezone_p)(const char *location);
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static void init()
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{
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static int initialized;
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if (!initialized) {
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static void *icaltzutil;
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icaltzutil = dlopen("libsyncevo-icaltz-util.so.0", RTLD_LAZY|RTLD_LOCAL);
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if (icaltzutil) {
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icaltimezone_get_component_p = dlsym(icaltzutil, "icaltimezone_get_component");
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icaltzutil_fetch_timezone_p = dlsym(icaltzutil, "icaltzutil_fetch_timezone");
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} else {
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icaltimezone_get_component_p = dlsym(RTLD_NEXT, "icaltimezone_get_component");
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icaltzutil_fetch_timezone_p = dlsym(RTLD_NEXT, "icaltzutil_fetch_timezone");
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}
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initialized = 1;
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}
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}
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void *icaltimezone_get_component(void *zone)
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{
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init();
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return icaltimezone_get_component_p(zone);
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}
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void *icaltzutil_fetch_timezone(const char *location)
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{
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init();
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return icaltzutil_fetch_timezone_p(location);
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}
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/*
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* For including the .o file in binaries via -Wl,-usyncevo_fetch_timezone.
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* We cannot use -Wl,-uicaltzutil_fetch_timezone because that gets satisfied by
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* libical itself.
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*/
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int syncevo_fetch_timezone;
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