Shared library support

Infrastructure for building independent shared library targets.

Based on work created by the PaX Team.

Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>

3 files changed, 58 insertions, 3 deletions

diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 0d1ca5bf42fb..11602e5efb3b 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 55c96cb8070f..50616ea25131 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 133edfae5b8a..45b5b1aaedbd 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)