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d424134073
The wrapper functions (e.g., 'Unwind_*' and friends) now have the same signature as the original function in 'libgcc', reside in a separate C file which is archived to cxx.lib.a. In supc++.o we prefix the wrapped functions with '_cxx_'. This also enables support for riscv. related to #1880
88 lines
2.9 KiB
Makefile
88 lines
2.9 KiB
Makefile
CXX_SRC_CC += misc.cc new_delete.cc malloc_free.cc exception.cc guard.cc
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# We need the libsupc++ include directory
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STDINC = yes
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vpath %.cc $(BASE_DIR)/src/base/cxx
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vpath %.c $(BASE_DIR)/src/base/cxx
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#
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# Here we define all symbols we want to hide in libsupc++ and libgcc_eh
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#
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LIBC_SYMBOLS += malloc free calloc realloc \
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abort fputc fputs fwrite \
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stderr strcat strcpy strlen \
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memcmp strncmp strcmp sprintf \
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__stderrp
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#
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# Symbols we wrap (see unwind.cc)
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#
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EH_SYMBOLS = _Unwind_Resume _Unwind_Complete _Unwind_DeleteException
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#
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# Additional functions for ARM
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#
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EH_SYMBOLS += __aeabi_unwind_cpp_pr0 __aeabi_unwind_cpp_pr1
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#
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# Take the right system libraries
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#
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# Normally, we never include build-system-internal files from library-
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# description files. For building the 'cxx' library, however, we need the
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# information about the used 'gcc' for resolving the location of the C++
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# support libraries. This definition is performed by 'mk/lib.mk' after
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# including this library description file. Hence, we need to manually
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# include 'global.mk' here.
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#
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include $(BASE_DIR)/mk/global.mk
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LIBCXX_GCC = $(shell $(CUSTOM_CXX_LIB) $(CC_MARCH) -print-file-name=libsupc++.a) \
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$(shell $(CUSTOM_CXX_LIB) $(CC_MARCH) -print-file-name=libgcc_eh.a || true)
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#
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# Dummy target used by the build system
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#
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SRC_S = supc++.o
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SRC_C = unwind.o
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CXX_SRC = $(sort $(CXX_SRC_CC))
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CXX_OBJECTS = $(addsuffix .o,$(basename $(CXX_SRC)))
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LOCAL_SYMBOLS = $(patsubst %,--localize-symbol=%,$(LIBC_SYMBOLS))
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REDEF_SYMBOLS = $(foreach S, $(EH_SYMBOLS), --redefine-sym $(S)=_cxx_$(S))
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#
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# Prevent symbols of the gcc support libs from being discarded during 'ld -r'
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#
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KEEP_SYMBOLS += __cxa_guard_acquire
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KEEP_SYMBOLS += __dynamic_cast
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KEEP_SYMBOLS += __cxa_throw_bad_array_new_length
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KEEP_SYMBOLS += __cxa_current_exception_type
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KEEP_SYMBOLS += _ZTVN10__cxxabiv116__enum_type_infoE
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KEEP_SYMBOLS += _ZN10__cxxabiv121__vmi_class_type_infoD0Ev
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KEEP_SYMBOLS += _ZTVN10__cxxabiv119__pointer_type_infoE
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KEEP_SYMBOLS += _ZTSN10__cxxabiv120__function_type_infoE
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#
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# Include dependency files for the corresponding object files except
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# when cleaning.
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#
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# Normally, the inclusion of dependency files is handled by 'generic.mk'.
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# However, the mechanism in 'generic.mk' considers only the dependencies
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# for the compilation units contained in the 'OBJECTS' variable. For building
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# the cxx library, we rely on the 'CXX_OBJECTS' variable instead. So we need to
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# include the dependenies manually.
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#
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ifneq ($(filter-out $(MAKECMDGOALS),clean),)
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-include $(CXX_OBJECTS:.o=.d)
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endif
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#
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# Rule to link all libc definitions and libsupc++ libraries
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# and to hide after that the exported libc symbols
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#
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$(SRC_S): $(CXX_OBJECTS)
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$(MSG_MERGE)$@
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$(VERBOSE)$(LD) $(LD_MARCH) $(addprefix -u ,$(KEEP_SYMBOLS)) -r $(CXX_OBJECTS) $(LIBCXX_GCC) -o $@.tmp
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$(MSG_CONVERT)$@
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$(VERBOSE)$(OBJCOPY) $(LOCAL_SYMBOLS) $(REDEF_SYMBOLS) $@.tmp $@
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$(VERBOSE)$(RM) $@.tmp
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