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Use -mlong-calls on arm and powerpc to work around relocations overflow

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On those architectures the .text section of the executables is too big
for the 32M immediate branch offset.  ld --relax is supposed to fix
things on powerpc, but it is actually ineffective here.  cc -mlong-calls
creates branches instructions using a full 32 bits register; FreeBSD
uses the same workaround.

A fix for lib/csu is still needed to avoid an overflow between .init
and .fini sections.  powerpc hasn't been tested, but we know that
devel/llvm is already broken there anyway.

ok Brad (maintainer)
This commit is contained in:
jca 2017-02-16 15:07:16 +00:00
parent d70fd21083
commit 3e62fdd5fa
1 changed files with 8 additions and 3 deletions
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11
devel/llvm/Makefile
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@ -1,4 +1,4 @@
# $OpenBSD: Makefile,v 1.132 2017/02/12 11:25:19 ajacoutot Exp $
# $OpenBSD: Makefile,v 1.133 2017/02/16 15:07:16 jca Exp $
# XXX: Remember to bump MODCLANG_VERSION in lang/clang/clang.port.mk when
# updating this port.
@ -66,8 +66,13 @@ CONFIGURE_ARGS = -DLLVM_ENABLE_FFI:Bool=False \
# Have the build disable PIE to workaround breakage that was
# introduced when PIE was enabled
.if ${MACHINE_ARCH} == "powerpc"
CONFIGURE_ARGS += -DCMAKE_EXE_LINKER_FLAGS="-Wl,--relax -nopie"
CONFIGURE_ARGS += -DCMAKE_SHARED_LINKER_FLAGS="-Wl,--relax -nopie"
CFLAGS += -mlongcall
CXXFLAGS += -mlongcall
CONFIGURE_ARGS += -DCMAKE_EXE_LINKER_FLAGS="-nopie"
CONFIGURE_ARGS += -DCMAKE_SHARED_LINKER_FLAGS="-nopie"
.elif ${MACHINE_ARCH} == "arm"
CFLAGS += -mlong-calls
CXXFLAGS += -mlong-calls
.endif
TEST_TARGET = check