From: Emese Revfy <re.emese@gmail.com>
To: linux-kbuild@vger.kernel.org
Cc: pageexec@freemail.hu, spender@grsecurity.net,
kernel-hardening@lists.openwall.com, mmarek@suse.com,
keescook@chromium.org, linux@rasmusvillemoes.dk,
fengguang.wu@intel.com, dvyukov@google.com,
linux-kernel@vger.kernel.org
Subject: [PATCH v5 1/5] Shared library support
Date: Mon, 7 Mar 2016 00:03:29 +0100 [thread overview]
Message-ID: <20160307000329.a51b2b8f4fdb0e60344f0b20@gmail.com> (raw)
In-Reply-To: <20160307000208.1bec3e7dc874489d1b4fcbb4@gmail.com>
Infrastructure for building independent shared library targets.
This effectively also reverts commit 62e2210798ed38928ab24841e8b4878a
(Masahiro Yamada, kbuild: drop shared library support from Makefile.host).
Signed-off-by: Emese Revfy <re.emese@gmail.com>
---
scripts/Makefile.build | 2 +-
scripts/Makefile.clean | 3 ++-
scripts/Makefile.host | 69 +++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 71 insertions(+), 3 deletions(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 130a452..bd2a31e 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -60,7 +60,7 @@ endif
endif
# Do not include host rules unless needed
-ifneq ($(hostprogs-y)$(hostprogs-m),)
+ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
include scripts/Makefile.host
endif
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index 55c96cb..e4e88ab 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -38,7 +38,8 @@ subdir-ymn := $(addprefix $(obj)/,$(subdir-ymn))
__clean-files := $(extra-y) $(extra-m) $(extra-) \
$(always) $(targets) $(clean-files) \
$(host-progs) \
- $(hostprogs-y) $(hostprogs-m) $(hostprogs-)
+ $(hostprogs-y) $(hostprogs-m) $(hostprogs-) \
+ $(hostlibs-y) $(hostlibs-m) $(hostlibs-)
__clean-files := $(filter-out $(no-clean-files), $(__clean-files))
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 133edfa..4d180d9 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -20,7 +20,25 @@
# Will compile qconf as a C++ program, and menu as a C program.
# They are linked as C++ code to the executable qconf
+# hostprogs-y := conf
+# conf-objs := conf.o libkconfig.so
+# libkconfig-objs := expr.o type.o
+# Will create a shared library named libkconfig.so that consists of
+# expr.o and type.o (they are both compiled as C code and the object files
+# are made as position independent code).
+# conf.c is compiled as a C program, and conf.o is linked together with
+# libkconfig.so as the executable conf.
+# Note: Shared libraries consisting of C++ files are not supported
+
+# hostcc-option
+# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
+
+hostcc-option = $(call try-run,\
+ $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
+
__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
+__hostlibs := $(sort $(hostlibs-y) $(hostlibs-m))
+__hostcxxlibs := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
# C code
# Executables compiled from a single .c file
@@ -42,6 +60,19 @@ host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
# C++ Object (.o) files compiled from .cc files
host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
+# Shared libaries (only .c supported)
+# Shared libraries (.so) - all .so files referenced in "xxx-objs"
+host-cshlib := $(sort $(filter %.so, $(host-cobjs)))
+host-cshlib += $(sort $(filter %.so, $(__hostlibs)))
+host-cxxshlib := $(sort $(filter %.so, $(__hostcxxlibs)))
+# Remove .so files from "xxx-objs"
+host-cobjs := $(filter-out %.so,$(host-cobjs))
+host-cxxobjs := $(filter-out %.so,$(host-cxxobjs))
+
+# Object (.o) files used by the shared libaries
+host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
+host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
+
# output directory for programs/.o files
# hostprogs-y := tools/build may have been specified.
# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
@@ -56,6 +87,10 @@ host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
+host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
+host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
+host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
+host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
obj-dirs += $(host-objdirs)
@@ -124,5 +159,37 @@ quiet_cmd_host-cxxobjs = HOSTCXX $@
$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
$(call if_changed_dep,host-cxxobjs)
+# Compile .c file, create position independent .o file
+# host-cshobjs -> .o
+quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
+ cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
+$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
+ $(call if_changed_dep,host-cshobjs)
+
+# Compile .c file, create position independent .o file
+# host-cxxshobjs -> .o
+quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
+ cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
+$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
+ $(call if_changed_dep,host-cxxshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cshlib)
+quiet_cmd_host-cshlib = HOSTLLD -shared $@
+ cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
+ $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
+ $(call if_changed,host-cshlib)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cxxshlib)
+quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
+ cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
+ $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cxxshlib): $(obj)/%: $(host-cxxshobjs) FORCE
+ $(call if_changed,host-cxxshlib)
+
targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
- $(host-cxxmulti) $(host-cxxobjs)
+ $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
--
2.4.1
next prev parent reply other threads:[~2016-03-06 23:05 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-06 23:02 [PATCH v5 0/5] Introduce GCC plugin infrastructure Emese Revfy
2016-03-06 23:03 ` Emese Revfy [this message]
2016-03-07 21:05 ` [PATCH v5 1/5] Shared library support Kees Cook
2016-03-07 21:32 ` Emese Revfy
2016-03-11 6:19 ` Masahiro Yamada
2016-03-14 20:14 ` Emese Revfy
2016-03-16 7:50 ` Masahiro Yamada
2016-03-06 23:04 ` [PATCH v5 2/5] GCC plugin infrastructure Emese Revfy
2016-03-09 9:01 ` [kernel-hardening] " David Brown
2016-03-09 20:50 ` Kees Cook
2016-03-09 22:07 ` Emese Revfy
2016-03-09 22:03 ` Emese Revfy
2016-03-11 6:25 ` Masahiro Yamada
2016-03-14 20:52 ` Emese Revfy
2016-03-16 7:41 ` Masahiro Yamada
2016-03-16 21:06 ` Emese Revfy
2016-03-14 21:25 ` PaX Team
2016-03-16 7:34 ` Masahiro Yamada
2016-03-16 12:49 ` PaX Team
2016-03-17 4:09 ` Masahiro Yamada
2016-03-24 0:07 ` Emese Revfy
2016-03-26 2:39 ` Masahiro Yamada
2016-03-27 21:09 ` Emese Revfy
2016-04-02 4:32 ` Masahiro Yamada
2016-03-06 23:05 ` [PATCH v5 3/5] Add Cyclomatic complexity GCC plugin Emese Revfy
2016-03-11 6:26 ` Masahiro Yamada
2016-03-14 21:02 ` Emese Revfy
2016-03-06 23:06 ` [PATCH v5 4/5] Documentation for the GCC plugin infrastructure Emese Revfy
2016-03-06 23:07 ` [PATCH v5 5/5] Add sancov plugin Emese Revfy
2016-03-07 21:07 ` Kees Cook
2016-03-07 21:29 ` Emese Revfy
2016-03-08 10:54 ` Dmitry Vyukov
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