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"?
In any case, libasound is built before "make" halts and is 29kb smaller (stripped) with lto :)
John