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s390: Prevent GOT relocations

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Use the "-fno-optimize-sibling-calls" gcc option to prevent GOT relocations
caused by gcc versions without the commit "S/390: Fix 64 bit sibcall":

 * https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=233169

Otherwise we get compile errors like:

 GEN      criu/pie/parasite-blob.h
 Error (compel/src/lib/handle-elf-host.c:572):
 Unsupported relocation of type 26

Those can be caused by the following relocation types:

 * R_390_GOTENT (e.g. RHEL7 based systems)
 * R_390_GOTPCDBL (e.g. Debian Jessie)
 * R_390_GOT12 (e.g. Debian Jessie)

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
This commit is contained in:
Michael Holzheu 2017-07-14 11:23:26 +02:00 committed by Pavel Emelyanov
parent 6603b419c7
commit 254094d66f
1 changed files with 7 additions and 5 deletions
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12
Makefile.compel
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@ -71,10 +71,12 @@ compel-install-targets += compel/$(LIBCOMPEL_SO)
compel-install-targets += compel/compel
compel-install-targets += $(compel-plugins)
# We assume that compel code does not change floating point registers.
# On s390 gcc uses fprs to cache gprs. Therefore disable floating point
# with -msoft-float.
#
# Also ensure with -fno-optimize-sibling-calls that we don't create GOT
# (Global Offset Table) relocations with gcc compilers that don't have
# commit "S/390: Fix 64 bit sibcall".
#
ifeq ($(ARCH),s390)
CFLAGS += -msoft-float
HOSTCFLAGS += -msoft-float
CFLAGS += -msoft-float -fno-optimize-sibling-calls
HOSTCFLAGS += -msoft-float -fno-optimize-sibling-calls
endif