110 lines
3.7 KiB
Makefile
110 lines
3.7 KiB
Makefile
#
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# Make Linux headers of the host platform available to the program
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#
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include $(call select_from_repositories,lib/import/import-syscall.mk)
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#
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# Manually supply all library search paths of the host compiler to our tool
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# chain.
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#
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HOST_LIB_SEARCH_DIRS := $(shell cc -print-search-dirs | grep libraries |\
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sed "s/.*=//" | sed "s/:/ /g" |\
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sed "s/\/ / /g" | sed "s/\/\$$//")
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#
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# Add search path for 'limits.h'
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#
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# We cannot simply extend 'INC_DIR' because this would give precedence to the
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# host include search paths over Genode search path. The variable HOST_INC_DIR
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# is appended to the include directory list.
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#
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HOST_INC_DIR += $(shell echo "int main() {return 0;}" |\
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LANG=C $(CXX) -x c++ -v -E - 2>&1 |\
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sed '/^\#include <\.\.\.> search starts here:/,/^End of search list/!d' |\
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grep "include-fixed")
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#
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# Add search paths for normal libraries
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#
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CXX_LINK_OPT += $(addprefix -L,$(HOST_LIB_SEARCH_DIRS))
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#
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# Determine ldconfig executable
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#
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# On Ubuntu, /sbin/ is in the PATH variable. Hence we try using the program
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# found via 'which'. If 'which' does not return anything (i.e., on Debian),
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# try using the expected location '/sbin/'.
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#
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LDCONFIG := $(firstword $(wildcard $(shell which ldconfig) /sbin/ldconfig))
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ifeq ($(LDCONFIG),)
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$(error ldconfig is not found)
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endif
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#
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# Add search paths for shared-library lookup
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#
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# We add all locations of shared libraries present in the ld.cache to our
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# library search path.
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#
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HOST_SO_SEARCH_DIRS := $(sort $(dir $(shell $(LDCONFIG) -p | sed "s/^.* \//\//" | grep "^\/")))
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LINK_ARG_PREFIX := -Wl,
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CXX_LINK_OPT += $(addprefix $(LINK_ARG_PREFIX)-rpath-link $(LINK_ARG_PREFIX),$(HOST_SO_SEARCH_DIRS))
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#
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# The '__libc_csu_init' function is normally provided by the C library. We
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# override the libc's version in our 'lx_hybrid' library to have a hook for
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# Genode-specific initializations. Unfortunately, this way, we get two symbols
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# with the same name. So we have to tell the linker to be forgiving. The order
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# of the libraries at the linker command line determines which symbol is used.
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# Therefore it is important to have 'lx_hybrid.lib.so' listed before '-lc',
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# which is always the case when supplying '-lc' via 'EXT_OBJECTS' (not
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# 'CXX_LINK_OPT').
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#
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CXX_LINK_OPT += -Wl,--allow-multiple-definition
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#
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# Make exceptions work
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#
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CXX_LINK_OPT += -Wl,--eh-frame-hdr
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#
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# Add all libraries and their dependencies specified at the 'LX_LIBS'
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# variable to the linker command line
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#
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ifneq ($(LX_LIBS),)
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EXT_OBJECTS = $(shell pkg-config --static --libs $(LX_LIBS))
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endif
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#
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# Use the host's startup codes, linker script, and dynamic linker
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#
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EXT_OBJECTS += $(shell cc -print-file-name=crt1.o)
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EXT_OBJECTS += $(shell cc -print-file-name=crti.o)
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EXT_OBJECTS += $(shell cc -print-file-name=crtbegin.o)
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EXT_OBJECTS += $(shell cc -print-file-name=crtend.o)
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EXT_OBJECTS += $(shell cc -print-file-name=crtn.o)
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EXT_OBJECTS += -lgcc -lgcc_s -lsupc++ -lc
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EXT_OBJECTS += -lpthread
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#
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# Some header files installed on GNU/Linux test for the GNU compiler. For
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# example, 'stdio.h' might complain with the following error otherwise:
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#
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# /usr/include/stdio.h:432:27: error: expected initializer before ‘throw’
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# /usr/include/stdio.h:488:6: error: expected initializer before ‘throw’
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#
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# By manually defining '_GNU_SOURCE', the header files are processed as
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# expected.
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#
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CC_OPT += -D_GNU_SOURCE
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USE_HOST_LD_SCRIPT = yes
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ifeq (x86_64,$(findstring x86_64,$(SPECS)))
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib64/ld-linux-x86-64.so.2
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else
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CXX_LINK_OPT += -Wl,--dynamic-linker=/lib/ld-linux.so.2
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endif
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# because we use the host compiler's libgcc, omit the Genode toolchain's version
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LD_LIBGCC =
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