https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84148
--- Comment #9 from igor.v.tsimbalist at intel dot com --- How can I check the fixes w/o old HW? I tried specifying --target=pentium to configure but the build has failed with the message *** Configuration i586-pc-none not supported make[1]: *** [configure-gcc] Error 1 make[1]: Leaving directory `/export/users/itsimbal/gcc_ws/build.cet' make: *** [all] Error 2 Igor > -----Original Message----- > From: hjl.tools at gmail dot com [mailto:gcc-bugzi...@gcc.gnu.org] > Sent: Tuesday, February 13, 2018 2:12 PM > To: Tsimbalist, Igor V <igor.v.tsimbal...@intel.com> > Subject: [Bug target/84148] CET shouldn't be enabled in 32-bit run-time > libraries by default > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84148 > > --- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> --- > (In reply to igor.v.tsimbalist from comment #7) > > (In reply to H.J. Lu from comment #6) > > > (In reply to igor.v.tsimbalist from comment #4) > > > > Created attachment 43400 [details] > > > > patch > > > > > > 2 questions: > > > > > > 1. Should 32-bit multilib target libraries compiled on 64-bit host > > > enable CET? > > > 2. Should 64-bit multilib target libraries compiled with 32-bit compiler > > > enable CET? > > > > Is there a configuration variable holding an indication of bit-ness for > > which the compilation of a library is done? I see there is some code in > > configure.ac in libgcc evaluating the host_address (32 or 64 bits) > > > > # Check 32bit or 64bit. In the case of MIPS, this really determines the > > # word size rather than the address size. > > cat > conftest.c <<EOF > > #if defined(__x86_64__) || (!defined(__i386__) && defined(__LP64__)) \ > > || defined(__mips64) > > host_address=64 > > #else > > host_address=32 > > #endif > > EOF > > eval `${CC-cc} -E conftest.c | grep host_address=` > > rm -f conftest.c > > > > If I use the 'host_address' in cet.m4 I got the expected results for libgcc: > > by default 64-bit library is CET enabled, 32-bit library is not. > > That would be wrong for x32. We need to enable CET for x86-64 > by default, regardless address size. To enable CET, we only > need to check if __SSE2__ is defined since all SSE2 processors > support multi-byte NOPs. > > -- > You are receiving this mail because: > You are on the CC list for the bug.
