On Sun, Mar 29, 2015 at 7:25 PM, H.J. Lu <hjl.to...@gmail.com> wrote: > We shouldn't call external function, __cpu_indicator_init, while an object > is being relocated since its .got.plt section hasn't been updated. It > works for non-PIE since no update on .got.plt section is required. This > patch hides __cpu_indicator_init/__cpu_model from linker to force linker > to resolve __cpu_indicator_init/__cpu_model to their hidden definitions > in libgcc.a while providing backward binary compatibility. > > OK for trunk, 4.9 and 4.9 branches? > > Thanks. > > > H.J. > --- > libgcc/ > > PR target/65612 > * config/i386/cpuinfo.c (__cpu_model): Initialize. > (__cpu_indicator_init@GCC_4.8.0): New. > (__cpu_model@GCC_4.8.0): Likewise. > > gcc/testsuite/ > > PR target/65612 > * g++.dg/ext/mv18.C: New test. > * g++.dg/ext/mv19.C: Likewise. > * g++.dg/ext/mv20.C: Likewise.
It doesn' work for shared C++ library: /export/build/gnu/gcc-x32/release/usr/gcc-5.0.0-x32/bin/g++ -O2 -c -o main.o main.cc /export/build/gnu/gcc-x32/release/usr/gcc-5.0.0-x32/bin/g++ -shared -fPIC -O2 -o libmv20.so mv20.cc /export/build/gnu/gcc-x32/release/usr/gcc-5.0.0-x32/bin/g++ -O2 -o x main.o libmv20.so -Wl,-R,. /usr/local/bin/ld: x: hidden symbol `__cpu_model' in /export/build/gnu/gcc-x32/release/usr/gcc-5.0.0-x32/bin/../lib/gcc/x86_64-unknown-linux-gnu/5.0.0/libgcc.a(cpuinfo.o) is referenced by DSO /usr/local/bin/ld: final link failed: Bad value collect2: error: ld returned 1 exit status Makefile:12: recipe for target 'x' failed make: *** [x] Error 1 [hjl@gnu-tools-1 pr65612]$ -- H.J.