Dne 5.1.2018 v 12:00 John Frankish napsal(a): >>>>> Using gcc-7.2.0 and alsa-lib-1.1.5 >>>>> >>>>> Is there a way to compile alsa-lib with lto (the method below works with alsa-plugins and alsa-utils)? >>>>> >>>>> Compiling alsa-lib like this works fine: >>>>> >>>>> CC="gcc -mtune=generic -Os -pipe" CXX="g++ -mtune=generic -Os >>>>> -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local >>>>> --disable-static --localstatedir=/var >>>>> --with-configdir=/usr/local/etc/alsa >>>>> >>>>> ..but compiling with lto like this fails as per below: >>>>> >>>>> CC=" gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" >>>>> CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe >>>>> -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local >>>>> --disable-static --localstatedir=/var >>>>> --with-configdir=/usr/local/etc/alsa >>>>> >>>>> libtool: link: gcc -flto -fuse-linker-plugin -mtune=generic -Os >>>>> -pipe -o .libs/aserver aserver.o ../src/.libs/libasound.so -lm >>>>> -ldl -lpthread -lrt >>>>> /tmp/ccoTf6DH.ltrans0.ltrans.o: In function `pcm_shm_cmd': >>>>> <artificial>:(.text+0xe7a): undefined reference to `snd_pcm_forward' >>>>> ../src/.libs/libasound.so: undefined reference to `snd_timer_params_set_filter' >>>>> ../src/.libs/libasound.so: undefined reference to `snd_ctl_elem_info_get_dimension' >>>>> ../src/.libs/libasound.so: undefined reference to `snd_ctl_elem_info_get_dimensions' >>>>> collect2: error: ld returned 1 exit status >>>>> make[1]: *** [Makefile:333: aserver] Error 1 >>>>> make[1]: Leaving directory '/usr/src/alsa-lib-1.1.5/aserver' >>>>> make: *** [Makefile:338: all-recursive] Error 1 Command exited >>>>> with non-zero status 2 >>>> >>>> That's interesting. These are basically fallouts of the internal >>>> function calls, and they should have been called with INTERNAL() >>>> wrapper for covering the versioned symbols. >>>> >>>> I fixed the latest git tree, but still something doesn't work with >>>> linkage in aserver. I guess Makefile.am in aserver needs to be >>>> fixed somehow, but I leave it as is for now, as you can work around >>>> it by disabling via the configure option. >>>> >>> Thanks - I'm not sure though what you mean by "configure option" - there is no "--disable-aserver"? >> >> It can be done by specifying --with-pcm-plugins without shm. >> But it'd be good to have --disable-aserver option for the easiness (or at best fix the aserver build :) >> >>> In any case, libasound is built before "make" halts and is 29kb >>> smaller (stripped) with lto :) >> >> And does everything still work, hopefully? >> > Oops - spoke too soon :( > > Using libasound from alsa-lib-1.1.5 compiled with lto, but without your update from alsa git: > > $ speaker-test -Ddefault:1 -c2 -t wav -l1 > > speaker-test 1.1.5 > > Playback device is default:1 > Stream parameters are 48000Hz, S16_LE, 2 channels > WAV file(s) > Rate set to 48000Hz (requested 48000Hz) > speaker-test: relocation error: speaker-test: symbol snd_pcm_hw_params_get_buffer_size_min, version ALSA_0.9.0rc4 not defined in file libasound.so.2 with link time reference It looks like we should use 'externally_visible' flag for the versioned symbols, too. It was introduces for '-fwhole-program' but it seems that '-flto' sees this flag, too. Jaroslav -- Jaroslav Kysela <perex@xxxxxxxx> Linux Sound Maintainer; ALSA Project; Red Hat, Inc. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
