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Date: Mon, 27 Apr 2015 23:12:34 -0700
From: Andre McCurdy <armccurdy@...il.com>
To: musl@...ts.openwall.com
Cc: Andre McCurdy <armccurdy@...il.com>
Subject: [PATCH] force LTO to be disabled when compiling dlstart.lo
When LTO is enabled, the _dlstart_c symbol seems to get removed before
the crt_arch.h assembler fragment which references it has been linked.
Disabling LTO for dlstart.lo is a less intrusive workaround than making
_dlstart_c globally visible.
Signed-off-by: Andre McCurdy <armccurdy@...il.com>
---
Makefile | 4 ++++
configure | 8 ++++++++
2 files changed, 12 insertions(+)
diff --git a/Makefile b/Makefile
index 6559295..48580fc 100644
--- a/Makefile
+++ b/Makefile
@@ -89,6 +89,10 @@ src/ldso/dlstart.lo src/ldso/dynlink.lo: src/internal/dynlink.h arch/$(ARCH)/rel
crt/crt1.o crt/Scrt1.o src/ldso/dlstart.lo: $(wildcard arch/$(ARCH)/crt_arch.h)
+# Disable LTO as a workaround for the _dlstart_c symbol being removed
+# before the crt_arch.h assembler fragment which references it is linked.
+src/ldso/dlstart.lo: CFLAGS += $(CFLAGS_NOLTO)
+
crt/Scrt1.o: CFLAGS += -fPIC
OPTIMIZE_SRCS = $(wildcard $(OPTIMIZE_GLOBS:%=src/%))
diff --git a/configure b/configure
index 143dc92..69c6dab 100755
--- a/configure
+++ b/configure
@@ -112,6 +112,7 @@ fi
CFLAGS_C99FSE=
CFLAGS_AUTO=
CFLAGS_MEMOPS=
+CFLAGS_NOLTO=
CFLAGS_NOSSP=
LDFLAGS_AUTO=
OPTIMIZE_GLOBS=
@@ -296,6 +297,12 @@ CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__="
fi
#
+# Check for options to disable LTO. If not found, this is not an
+# error; we assume the toolchain does not support LTO.
+#
+tryflag CFLAGS_NOLTO -fno-lto
+
+#
# Check for options to disable stack protector, which needs to be
# disabled for a few early-bootstrap translation units. If not found,
# this is not an error; we assume the toolchain does not do ssp.
@@ -564,6 +571,7 @@ CC = $CC
CFLAGS = $CFLAGS_AUTO $CFLAGS
CFLAGS_C99FSE = $CFLAGS_C99FSE
CFLAGS_MEMOPS = $CFLAGS_MEMOPS
+CFLAGS_NOLTO = $CFLAGS_NOLTO
CFLAGS_NOSSP = $CFLAGS_NOSSP
CPPFLAGS = $CPPFLAGS
LDFLAGS = $LDFLAGS_AUTO $LDFLAGS
--
1.9.1
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