Issue 29712: --enable-optimizations does not work with --enable-shared (original) (raw)

Issue29712

Created on 2017-03-03 15:45 by halfcoder, last changed 2022-04-11 14:58 by admin.

Messages (4)
msg288898 - (view)	Author: Lai, Yian (halfcoder)	Date: 2017-03-03 15:45
I want to altinstall 3.6 with LTO+PGO optimizations, so: ./configure --enable-shared --enable-optimizations --prefix=$HOME/.local LDFLAGS=-Wl,-rpath=$HOME/.local/lib make (./configure arguments refer to issue #27685) But I get in trouble when running compiled python to generate posix vars: ... gcc -pthread -shared -Wl,-rpath=/home/halfcoder/.local/lib -fprofile-generate -Wl,--no-as-needed -o libpython3.so -Wl,-hlibpython3.so libpython3.6m.so gcc -pthread -Wl,-rpath=/home/halfcoder/.local/lib -fprofile-generate -Xlinker -export-dynamic -o python Programs/python.o -L. -lpython3.6m -lpthread -ldl -lutil -lm LD_LIBRARY_PATH=/home/halfcoder/.local/src/Python-3.6.0-optmiz ./python -E -S -m sysconfig --generate-posix-vars ;\ if test $? -ne 0 ; then \ echo "generate-posix-vars failed" ; \ rm -f ./pybuilddir.txt ; \ exit 1 ; \ fi ./python: symbol lookup error: ./python: undefined symbol: __gcov_indirect_call_profiler generate-posix-vars failed make[2]: *** [pybuilddir.txt] Error 1 make[2]: Leaving directory `/home/halfcoder/.local/src/Python-3.6.0-optmiz' make[1]: *** [build_all_generate_profile] Error 2 make[1]: Leaving directory `/home/halfcoder/.local/src/Python-3.6.0-optmiz' make: *** [profile-opt] Error 2 gcc information below: Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux Thread model: posix gcc version 4.8.5 20150623 (Red Hat 4.8.5-11) (GCC)
msg292927 - (view)	Author: Antoine Pitrou (pitrou) *	Date: 2017-05-03 16:58
For the record, --enable-shared generally produces slower builds than by default. The slowdown depends on the platform, but it's noticeable on x86-64 and much more on ARM.
msg313644 - (view)	Author: Eric Dujardin (eric957)	Date: 2018-03-12 12:55
I have the same error when building 3.6.4, however not exactly with the same options. Some context first: $ lsb_release -d; lscpu |head -1 Description: Ubuntu 14.04.5 LTS Architecture: x86_64 $ gcc --version gcc (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4 I'm careful to start from a freshly untarred source tree. This configuration builds a working installation: $ ./configure --prefix=$PYTHON --enable-optimizations --enable-shared LDFLAGS="-Wl,-rpath=$PYTHON/lib -Wl,-Bsymbolic-functions -Wl,-z,relro" --with-computed-gotos --with-system-ffi --with-fpectl --with-system-libmpdec $ make profile-opt However, I get the reported error when CFLAGS="-mtune=core-avx2 -march=core-avx2" is added. This set of options works fine without --enable-shared, i.e. this is what I am using for static builds: $ ./configure --prefix=$PYTHON --enable-optimizations LDFLAGS="-Wl,-z,relro" --with-computed-gotos --with-system-ffi --with-fpectl --with-system-libmpdec CFLAGS="-mtune=core-avx2 -march=core-avx2 -Wformat -Werror=format-security" Note, with the following configuration (-mtune without -march), compilation just blocks on Objects/memoryobject.c (ie, gcc never completes): $ ./configure --prefix=$PYTHON --enable-optimizations --enable-shared LDFLAGS="-Wl,-rpath=$PYTHON/lib -Wl,-Bsymbolic-functions -Wl,-z,relro" --with-computed-gotos --with-system-ffi --with-fpectl --with-system-libmpdec CFLAGS="-mtune=core-avx2 -Werror=format-security" $ make profile-opt
msg335598 - (view)	Author: Stefan Ring (Ringding)	Date: 2019-02-15 10:27
I was having the same problem, and I just found out what it was: Because of -Wl,-rpath=..., this path gets baked into the binary, and LD_LIBRARY_PATH is ignored. So if you have a previous build lying around there, it will mess up the build.