Hi Andreas,
I'm trying to implement multilib support for ARC port of Glibc
and for that we seem to need to have unique slibdir/rtlddir pair per
each machine flavor. In our case these are at least:
- ARC700 (legacy ARCompact architecture)
- ARC HS38 (new gen ARCv2 architecture)
- ARC HS38 with hardware floating-point
- ARC HS48 (binary-compatible with HS38 but with different pipeline so
compiler schedules instructions differently)
- eventually there'll be newer generations like ARCv3/v4 etc
Given we have in GCC a dedicated "-mcpu" value for each of items above
my first thought was to "automatically" setup slibdir/rtlddir
based on "-mcpu" value passed in CC during configuration.
Something like that:
---------------------------------->8------------------------------------
+++ b/sysdeps/unix/sysv/linux/arc/configure.ac
@@ -2,3 +2,10 @@ 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
+
+# Extract "-mcpu=xxx" value from CC to install libs in a separate folder
+arc_mcpu=[`echo $CC | grep -Po '\-mcpu=\K[^ ]+'`]
+
+if test "$arc_mcpu" != "" ; then
+ LIBC_SLIBDIR_RTLDDIR([lib/${arc_mcpu}], [lib/${arc_mcpu}])
+fi
---------------------------------->8------------------------------------
But apparently that doesn't work due to your change [1] in
commit 128c43a2d630 ("LIBC_SLIBDIR_RTLDDIR: substitute arguments in single quotes").
I guess mentioned change is not supposed to be reverted but then
how do you think it's possible [if at all] to implement that kind of
"automatic" setup of slibdir/rtlddir?
[1] https://sourceware.org/git/?p=glibc.git;a=commit;h=128c43a2d630
-Alexey
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