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Message-Id: <20160513015619.0a92762bf9167233a5990226@gmail.com>
Date: Fri, 13 May 2016 01:56:19 +0200
From: Emese Revfy <re.emese@...il.com>
To: linux-kbuild@...r.kernel.org
Cc: pageexec@...email.hu, spender@...ecurity.net,
kernel-hardening@...ts.openwall.com, mmarek@...e.com,
keescook@...omium.org, linux@...musvillemoes.dk, fengguang.wu@...el.com,
dvyukov@...gle.com, linux-kernel@...r.kernel.org, david.brown@...aro.org,
yamada.masahiro@...ionext.com
Subject: [PATCH v8 1/4] Shared library support
Infrastructure for building independent shared library targets.
Signed-off-by: Emese Revfy <re.emese@...il.com>
---
scripts/Makefile.build | 2 +-
scripts/Makefile.clean | 4 +++-
scripts/Makefile.host | 55 +++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 58 insertions(+), 3 deletions(-)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 0d1ca5b..11602e5 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..50616ea 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -38,7 +38,9 @@ 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-) \
+ $(hostcxxlibs-y) $(hostcxxlibs-m)
__clean-files := $(filter-out $(no-clean-files), $(__clean-files))
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 133edfa..45b5b1a 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -20,7 +20,15 @@
# Will compile qconf as a C++ program, and menu as a C program.
# They are linked as C++ code to the executable qconf
+# 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))
+host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
+host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
# C code
# Executables compiled from a single .c file
@@ -42,6 +50,10 @@ 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)))
+# 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 +68,10 @@ 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 +140,42 @@ 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
+# Note that plugin capable gcc versions can be either C or C++ based
+# therefore plugin source files have to be compilable in both C and C++ mode.
+# This is why a C++ compiler is invoked on a .c 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): FORCE
+ $(call if_changed,host-cshlib)
+$(call multi_depend, $(host-cshlib), .so, -objs)
+
+# 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): FORCE
+ $(call if_changed,host-cxxshlib)
+$(call multi_depend, $(host-cxxshlib), .so, -objs)
+
targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
- $(host-cxxmulti) $(host-cxxobjs)
+ $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
--
2.8.1
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