On 5/8/19 8:23 AM, Alexey Brodkin wrote: > Based on preprocessor defines we determine which type of ARC core > we're targeting and set slibdir accordingly so that on installation > of libraries to sysroot libs for different ARC cores end up in different > locations which match ARC Linux multilib spec. > > Note though it all only happens if 2 conditions happen simultaneously: > 1. Glibc configured with "--prefix=/usr" So how can we do this in a typical cross compile setup. > 2. "-mcpu=xxx" exists in CC passed to Glibc's configure script > > I.e. when we build Glibc for default CPU libs are installed in default > location. > > Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx> > --- > sysdeps/unix/sysv/linux/arc/configure | 329 ++++++++++++++++++++++++++++++- > sysdeps/unix/sysv/linux/arc/configure.ac | 70 +++++++ > 2 files changed, 398 insertions(+), 1 deletion(-) > mode change 100644 => 100755 sysdeps/unix/sysv/linux/arc/configure skipping generated file > diff --git a/sysdeps/unix/sysv/linux/arc/configure.ac b/sysdeps/unix/sysv/linux/arc/configure.ac > index a9528032d32..3615db8eabc 100644 > --- a/sysdeps/unix/sysv/linux/arc/configure.ac > +++ b/sysdeps/unix/sysv/linux/arc/configure.ac > @@ -2,3 +2,73 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory. > # Local configure fragment for sysdeps/unix/sysv/linux/arc. > > arch_minimum_kernel=3.9.0 > + > +# If "-mcpu=xxx" found in passed CC assume we're building for > +# non-default CPU and thus we need to install libs in non-default location. > +if AC_TRY_COMMAND([echo $CC | grep -F "mcpu" > /dev/null]); > +then > + libc_cv_arc_arch=no > + > + # If this is ARCompact-based core > + AC_EGREP_CPP(yes, [#ifdef __ARC700__ > + yes > + #endif > + ],libc_cv_arc_arch=arc700) > + > + # If this is ARCv2-based core > + AC_EGREP_CPP(yes, [#ifdef __ARCHS__ > + yes > + #endif > + ],libc_cv_arc_arch=hs) > + > + if test $libc_cv_arc_arch = no; then > + AC_MSG_ERROR([Unable to determine ARC architecture]) > + fi > + > + if test $libc_cv_arc_arch = arc700; then > + # NPS400 > + AC_EGREP_CPP(yes, [#ifdef __NPS400__ > + yes > + #endif > + ],libc_cv_arc_arch=nps400) I don't see any activity on NPS front so best to skip that in new code for now. > + else > + # Base-line HS38 + HW multiplier > + AC_EGREP_CPP(yes, [#ifdef __ARC_MPY__ > + yes > + #endif > + ],libc_cv_arc_arch=archs) > + > + # Base-line HS38 + HW quad-multiplier > + AC_EGREP_CPP(yes, [#ifdef __ARC_MPY_QMACW__ > + yes > + #endif > + ],libc_cv_arc_arch=hs38) > + > + # Base-line HS38 + HW quad-multiplier + FPU > + AC_EGREP_CPP(yes, [#ifdef __ARC_FPU_DP__ > + yes > + #endif > + ],libc_cv_arc_arch=hs38_linux) > + fi > + This zoo makes sense for gcc - for say baremetal stuff, but we don't want to spend time (even machine time) building glibc for those. You can assume MPY to be always present when running linux/glibc. > + case $libc_cv_arc_arch in > + arc700) > + LIBC_SLIBDIR_RTLDDIR([lib/arc700], [lib/arc700]) > + ;; > + nps400) > + LIBC_SLIBDIR_RTLDDIR([lib/nps400], [lib/nps400]) > + ;; > + hs) > + LIBC_SLIBDIR_RTLDDIR([lib/hs], [lib/hs]) Looking at https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/wiki/Understanding-GCC-mcpu-optio I'd recommend drop above > + ;; > + archs) > + LIBC_SLIBDIR_RTLDDIR([lib/archs], [lib/archs]) > + ;; ditto > + hs38) > + LIBC_SLIBDIR_RTLDDIR([lib/hs38], [lib/hs38]) > + ;; > + hs38_linux) > + LIBC_SLIBDIR_RTLDDIR([lib/hs38_linux], [lib/hs38_linux]) > + ;; > + esac > +fi -Vineet _______________________________________________ linux-snps-arc mailing list linux-snps-arc@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-snps-arc
