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authorSergei Trofimovich <slyfox@gentoo.org>2017-12-20 09:35:00 +0000
committerSergei Trofimovich <slyfox@gentoo.org>2017-12-20 09:52:55 +0000
commitac450135f29ef850303589af998373d936955476 (patch)
tree64a8796ea47de503bc596e73cbdc6919695364d2 /eclass
parentmail-mta/exim: version bump to 4.90 (diff)
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sys-libs/glibc: enable IFUNC support only on whitelisted ARCHes, bug #641216
We explicitly disable IFUNC support on the following targets: alpha/hppa/ia64/mips/m68k/nios2/riscv/sh to workaround weak IFUNC detection on binutils/glibc side. Otherwise at least on ia64 glibc generates IFUNC entries against compat librt.so.1 symbols (to redirect them back to libc.so.6) but linker does not produce correct relocations. As a result all IFUNC-backed functions don't work. Reported-by: Émeric Maschino Bug: https://sourceware.org/PR22634 Closes: https://bugs.gentoo.org/641216 Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Diffstat (limited to 'eclass')
-rw-r--r--eclass/toolchain-glibc.eclass11
1 files changed, 11 insertions, 0 deletions
diff --git a/eclass/toolchain-glibc.eclass b/eclass/toolchain-glibc.eclass
index 6580be2fb1e..d9c692f2ad8 100644
--- a/eclass/toolchain-glibc.eclass
+++ b/eclass/toolchain-glibc.eclass
@@ -815,6 +815,17 @@ glibc_do_configure() {
esac
fi
+ # Keep a whitelist of targets supporing IFUNC. glibc's ./configure
+ # is not robust enough to detect proper support:
+ # https://bugs.gentoo.org/641216
+ # https://sourceware.org/PR22634#c0
+ case $(tc-arch ${CTARGET}) in
+ # Keep whitelist of targets where autodetection mostly works.
+ amd64|x86|sparc|ppc|ppc64|arm|arm64|s390) ;;
+ # Blacklist everywhere else
+ *) myconf+=( libc_cv_ld_gnu_indirect_function=no ) ;;
+ esac
+
if version_is_at_least 2.25 ; then
myconf+=( --enable-stackguard-randomization )
else