freebsd-dev/lib/clang/Makefile.inc
Ed Maste bcf99d2d99 Add WITH_PIE knob to build Position Independent Executables
Building binaries as PIE allows the executable itself to be loaded at a
random address when ASLR is enabled (not just its shared libraries).

With this change PIE objects have a .pieo extension and INTERNALLIB
libraries libXXX_pie.a.

MK_PIE is disabled for some kerberos5 tools, Clang, and Subversion, as
they explicitly reference .a libraries in their Makefiles.  These can
be addressed on an individual basis later.  MK_PIE is also disabled for
rtld-elf because it is already position-independent using bespoke
Makefile rules.

Currently only dynamically linked binaries will be built as PIE.

Discussed with:	dim
Reviewed by:	kib
MFC after:	1 month
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D18423
2019-02-15 22:22:38 +00:00

12 lines
193 B
Makefile

# $FreeBSD$
.include <bsd.compiler.mk>
MK_PIE:= no # Explicit libXXX.a references
.if ${COMPILER_TYPE} == "clang"
DEBUG_FILES_CFLAGS= -gline-tables-only
.else
DEBUG_FILES_CFLAGS= -g1
.endif