Makefile: Add support for symbol versioning (ON by default) (#49012)

This enables symbol versioning by default, with the version string
`JL_LIBJULIA_1.10` (the version suffix is the SOMAJOR in general). This
will configure the linker to assign the specified version string to all
Julia-exported symbols.

As part of this change, the SOMAJOR has also been changed to be
MAJOR.MINOR instead of just MAJOR. This is required to allow multiple
minor releases of libjulia to live side-by-side in the same process.

`SYMBOL_VERSION_SUFFIX` is provided to allow appending an additional
unique "salt" to SOMAJOR, which can be helpful for creating template
binaries that will be "version-stamped" after distribution.

Correctly compute `LLVM_SHLIB_SYMBOL_VERSION` using
`llvm-config`, so USE_SYSTEM_LLVM should continue to work.

Author: topolarity

.gitignore

@@ -12,6 +12,7 @@
 /source-dist.tmp
 /source-dist.tmp1
 
+*.expmap
 *.exe
 *.dll
 *.dwo

Make.inc

@@ -188,15 +188,17 @@ JULIA_MINOR_VERSION := $(shell echo $(JULIA_VERSION) | cut -d'-' -f 1 | cut -d'.
 JULIA_PATCH_VERSION := $(shell echo $(JULIA_VERSION) | cut -d'-' -f 1 | cut -d'+' -f 1 | cut -d'.' -f 3)
 
 # libjulia's SONAME will follow the format libjulia.so.$(SOMAJOR). Before v1.0.0,
-# SOMAJOR will be a two-decimal value, e.g. libjulia.so.0.5, whereas at and beyond
-# v1.0.0, SOMAJOR will be simply the major version number, e.g. libjulia.so.1
+# somajor was a two-decimal value (e.g. libjulia.so.0.5). During v1.0.x - v1.9.x,
+# somajor was simply the major version number (e.g. libjulia.so.1). Starting in
+# v1.10.0, somajor is major.minor again (e.g. libjulia.so.1.10)
 # The file itself will ultimately symlink to libjulia.so.$(SOMAJOR).$(SOMINOR)
-ifeq ($(JULIA_MAJOR_VERSION),0)
 SOMAJOR := $(JULIA_MAJOR_VERSION).$(JULIA_MINOR_VERSION)
 SOMINOR := $(JULIA_PATCH_VERSION)
-else
-SOMAJOR := $(JULIA_MAJOR_VERSION)
-SOMINOR := $(JULIA_MINOR_VERSION)
+
+# This suffix affects libjulia's SONAME and the symbol version associated with
+# all of its exported symbols.
+ifdef SYMBOL_VERSION_SUFFIX
+SOMAJOR := $(SOMAJOR)_$(SYMBOL_VERSION_SUFFIX)
 endif
 
 ifneq ($(NO_GIT), 1)
@@ -488,7 +490,7 @@ endif
 
 JCFLAGS_COMMON    := -std=gnu11 -pipe $(fPIC) -fno-strict-aliasing -D_FILE_OFFSET_BITS=64
 JCFLAGS_CLANG     := $(JCFLAGS_COMMON)
-JCFLAGS_GCC       := $(JCFLAGS_COMMON)
+JCFLAGS_GCC       := $(JCFLAGS_COMMON) -fno-gnu-unique
 
 # AArch64 needs this flag to generate the .eh_frame used by libunwind
 JCPPFLAGS_COMMON  := -fasynchronous-unwind-tables
@@ -497,7 +499,7 @@ JCPPFLAGS_GCC     := $(JCPPFLAGS_COMMON)
 
 JCXXFLAGS_COMMON  := -pipe $(fPIC) -fno-rtti -std=c++14
 JCXXFLAGS_CLANG   := $(JCXXFLAGS_COMMON) -pedantic
-JCXXFLAGS_GCC     := $(JCXXFLAGS_COMMON)
+JCXXFLAGS_GCC     := $(JCXXFLAGS_COMMON) -fno-gnu-unique
 
 DEBUGFLAGS_COMMON := -O0 -DJL_DEBUG_BUILD -fstack-protector
 DEBUGFLAGS_CLANG  := $(DEBUGFLAGS_COMMON) -g
@@ -1317,7 +1319,7 @@ ifeq (supported, $(shell echo $(IFUNC_DETECT_SRC) | $(CC) -Werror -x c - -S -o /
 JCPPFLAGS += -DJULIA_HAS_IFUNC_SUPPORT=1
 endif
 JLDFLAGS += -Wl,-Bdynamic
-OSLIBS += -Wl,--version-script=$(JULIAHOME)/src/julia.expmap
+OSLIBS += -Wl,--version-script=$(BUILDROOT)/src/julia.expmap
 ifneq ($(SANITIZE),1)
 JLDFLAGS += -Wl,-no-undefined
 endif
@@ -1342,7 +1344,7 @@ OSLIBS += -lelf -lkvm -lrt -lpthread -latomic
 # See #21788
 OSLIBS += -lgcc_s
 
-OSLIBS += -Wl,--export-dynamic -Wl,--version-script=$(JULIAHOME)/src/julia.expmap \
+OSLIBS += -Wl,--export-dynamic -Wl,--version-script=$(BUILDROOT)/src/julia.expmap \
 	$(NO_WHOLE_ARCHIVE)
 endif
 
@@ -1357,7 +1359,7 @@ endif
 
 ifeq ($(OS), WINNT)
 HAVE_SSP := 1
-OSLIBS += -Wl,--export-all-symbols -Wl,--version-script=$(JULIAHOME)/src/julia.expmap \
+OSLIBS += -Wl,--export-all-symbols -Wl,--version-script=$(BUILDROOT)/src/julia.expmap \
 	$(NO_WHOLE_ARCHIVE) -lpsapi -lkernel32 -lws2_32 -liphlpapi -lwinmm -ldbghelp -luserenv -lsecur32 -latomic
 JLDFLAGS += -Wl,--stack,8388608
 ifeq ($(ARCH),i686)

cli/Makefile

@@ -104,14 +104,18 @@ julia-debug: $(build_bindir)/julia-debug$(EXE)
 libjulia-release: $(build_shlibdir)/libjulia.$(SHLIB_EXT)
 libjulia-debug: $(build_shlibdir)/libjulia-debug.$(SHLIB_EXT)
 
+ifneq (,$(filter $(OS), Linux FreeBSD))
+VERSIONSCRIPT := -Wl,--version-script=$(BUILDDIR)/julia.expmap
+endif
+
 ifeq ($(OS),WINNT)
 # On Windows we need to strip out exported functions from the generated import library.
 STRIP_EXPORTED_FUNCS := $(shell $(CPP_STDOUT) -I$(JULIAHOME)/src $(SRCDIR)/list_strip_symbols.h)
 endif
 
-$(build_shlibdir)/libjulia.$(JL_MAJOR_MINOR_SHLIB_EXT): $(LIB_OBJS) $(SRCDIR)/list_strip_symbols.h | $(build_shlibdir) $(build_libdir)
+$(build_shlibdir)/libjulia.$(JL_MAJOR_MINOR_SHLIB_EXT): $(LIB_OBJS) $(SRCDIR)/list_strip_symbols.h $(BUILDDIR)/julia.expmap | $(build_shlibdir) $(build_libdir)
 	@$(call PRINT_LINK, $(CC) $(call IMPLIB_FLAGS,$@.tmp) $(LOADER_CFLAGS) -shared $(SHIPFLAGS) $(LIB_OBJS) -o $@ \
-		$(JLIBLDFLAGS) $(LOADER_LDFLAGS) $(call SONAME_FLAGS,libjulia.$(JL_MAJOR_SHLIB_EXT)))
+		$(JLIBLDFLAGS) $(LOADER_LDFLAGS) $(VERSIONSCRIPT) $(call SONAME_FLAGS,libjulia.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia.$(JL_MAJOR_SHLIB_EXT) $@
 	@$(DSYMUTIL) $@
 ifeq ($(OS), WINNT)
@@ -120,9 +124,9 @@ ifeq ($(OS), WINNT)
 	@$(call PRINT_ANALYZE, $(OBJCOPY) $(build_libdir)/$(notdir $@).tmp.a $(STRIP_EXPORTED_FUNCS) $(build_libdir)/$(notdir $@).a && rm $(build_libdir)/$(notdir $@).tmp.a)
 endif
 
-$(build_shlibdir)/libjulia-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(LIB_DOBJS) $(SRCDIR)/list_strip_symbols.h | $(build_shlibdir) $(build_libdir)
+$(build_shlibdir)/libjulia-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(LIB_DOBJS) $(SRCDIR)/list_strip_symbols.h $(BUILDDIR)/julia.expmap | $(build_shlibdir) $(build_libdir)
 	@$(call PRINT_LINK, $(CC) $(call IMPLIB_FLAGS,$@.tmp) $(LOADER_CFLAGS) -shared $(DEBUGFLAGS) $(LIB_DOBJS) -o $@ \
-		$(JLIBLDFLAGS) $(LOADER_LDFLAGS) $(call SONAME_FLAGS,libjulia-debug.$(JL_MAJOR_SHLIB_EXT)))
+		$(JLIBLDFLAGS) $(LOADER_LDFLAGS) $(VERSIONSCRIPT) $(call SONAME_FLAGS,libjulia-debug.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia-debug.$(JL_MAJOR_SHLIB_EXT) $@
 	@$(DSYMUTIL) $@
 ifeq ($(OS), WINNT)
@@ -144,8 +148,12 @@ $(build_bindir)/julia$(EXE): $(EXE_OBJS) $(build_shlibdir)/libjulia.$(SHLIB_EXT)
 $(build_bindir)/julia-debug$(EXE): $(EXE_DOBJS) $(build_shlibdir)/libjulia-debug.$(SHLIB_EXT) | $(build_bindir)
 	@$(call PRINT_LINK, $(CC) $(LOADER_CFLAGS) $(DEBUGFLAGS) $(EXE_DOBJS) -o $@ $(LOADER_LDFLAGS) $(RPATH) -ljulia-debug)
 
+$(BUILDDIR)/julia.expmap: $(SRCDIR)/julia.expmap.in
+	sed <'$<' >'$@' -e 's/@JULIA_SHLIB_SYMBOL_VERSION@/JL_LIBJULIA_$(SOMAJOR)/'
+
 clean: | $(CLEAN_TARGETS)
 	rm -f $(BUILDDIR)/*.o $(BUILDDIR)/*.dbg.obj
 	rm -f $(build_bindir)/julia*
+	rm -f $(BUILDDIR)/julia.expmap
 
 .PHONY: clean release debug julia-release julia-debug

cli/julia.expmap.in

@@ -0,0 +1 @@
+@JULIA_SHLIB_SYMBOL_VERSION@ { global: *; };

deps/llvm-ver.make

@@ -17,3 +17,4 @@ LLVM_SHARED_LIB_VER_SUFFIX := $(LLVM_VER_MAJ)jl
 # e.g.: "libLLVM-14jl"
 LLVM_SHARED_LIB_NAME := libLLVM-$(LLVM_SHARED_LIB_VER_SUFFIX)
 LLVM_SHARED_LINK_FLAG := -lLLVM-$(LLVM_SHARED_LIB_VER_SUFFIX)
+LLVM_SHLIB_SYMBOL_VERSION := JL_LLVM_$(LLVM_VER_MAJ).$(LLVM_VER_MIN)

src/Makefile

@@ -119,6 +119,9 @@ ifeq ($(JULIACODEGEN),LLVM)
 ifneq ($(USE_SYSTEM_LLVM),0)
 # USE_SYSTEM_LLVM != 0
 CG_LLVMLINK += $(LLVM_LDFLAGS) $(shell $(LLVM_CONFIG_HOST) --libs --system-libs)
+LLVM_SHLIB_SYMBOL_VERSION := $(shell nm -D --with-symbol-versions $(shell $(LLVM_CONFIG_HOST) --libfiles --link-shared | awk '{print $1; exit}') | \
+                               grep _ZN4llvm3Any6TypeId | head -n 1 | sed -e 's/.*@//')
+
 # HACK: llvm-config doesn't correctly point to shared libs on all platforms
 #       https://github.com/JuliaLang/julia/issues/29981
 else
@@ -344,10 +347,10 @@ $(FLISP_EXECUTABLE_release): $(BUILDDIR)/flisp/libflisp.a
 $(FLISP_EXECUTABLE_debug): $(BUILDDIR)/flisp/libflisp-debug.a
 	$(MAKE) -C $(BUILDDIR)/flisp $(subst $(abspath $(BUILDDIR)/flisp)/,,$(abspath $(FLISP_EXECUTABLE_debug)))
 
-$(BUILDDIR)/flisp/libflisp.a: $(addprefix $(SRCDIR)/flisp/,*.h *.c) $(BUILDDIR)/support/libsupport.a
+$(BUILDDIR)/flisp/libflisp.a: $(addprefix $(SRCDIR)/flisp/,*.h *.c) $(BUILDDIR)/support/libsupport.a $(BUILDDIR)/julia.expmap
 	$(MAKE) -C $(SRCDIR)/flisp BUILDDIR='$(abspath $(BUILDDIR)/flisp)'
 
-$(BUILDDIR)/flisp/libflisp-debug.a: $(addprefix $(SRCDIR)/,flisp/*.h flisp/*.c) $(BUILDDIR)/support/libsupport-debug.a
+$(BUILDDIR)/flisp/libflisp-debug.a: $(addprefix $(SRCDIR)/,flisp/*.h flisp/*.c) $(BUILDDIR)/support/libsupport-debug.a $(BUILDDIR)/julia.expmap
 	$(MAKE) -C $(SRCDIR)/flisp debug BUILDDIR='$(abspath $(BUILDDIR)/flisp)'
 
 $(BUILDDIR)/julia_version.h: $(JULIAHOME)/VERSION
@@ -365,13 +368,17 @@ $(BUILDDIR)/julia_version.h: $(JULIAHOME)/VERSION
 
 CXXLD = $(CXX) -shared
 
-$(build_shlibdir)/libjulia-internal.$(JL_MAJOR_MINOR_SHLIB_EXT): $(SRCDIR)/julia.expmap $(OBJS) $(BUILDDIR)/flisp/libflisp.a $(BUILDDIR)/support/libsupport.a $(LIBUV)
+$(BUILDDIR)/julia.expmap: $(SRCDIR)/julia.expmap.in
+	sed <'$<' >'$@' -e "s/@JULIA_SHLIB_SYMBOL_VERSION@/JL_LIBJULIA_$(SOMAJOR)/" \
+		        -e "s/@LLVM_SHLIB_SYMBOL_VERSION@/$(LLVM_SHLIB_SYMBOL_VERSION)/"
+
+$(build_shlibdir)/libjulia-internal.$(JL_MAJOR_MINOR_SHLIB_EXT): $(BUILDDIR)/julia.expmap $(OBJS) $(BUILDDIR)/flisp/libflisp.a $(BUILDDIR)/support/libsupport.a $(LIBUV)
 	@$(call PRINT_LINK, $(CXXLD) $(call IMPLIB_FLAGS,$@) $(JCXXFLAGS) $(JL_CXXFLAGS) $(CXXLDFLAGS) $(SHIPFLAGS) $(OBJS) $(RPATH_LIB) -o $@ \
 		$(JLDFLAGS) $(JLIBLDFLAGS) $(RT_RELEASE_LIBS) $(call SONAME_FLAGS,libjulia-internal.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia-internal.$(SHLIB_EXT) $@
 	$(DSYMUTIL) $@
 
-$(build_shlibdir)/libjulia-internal-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(SRCDIR)/julia.expmap $(DOBJS) $(BUILDDIR)/flisp/libflisp-debug.a $(BUILDDIR)/support/libsupport-debug.a $(LIBUV)
+$(build_shlibdir)/libjulia-internal-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(BUILDDIR)/julia.expmap $(DOBJS) $(BUILDDIR)/flisp/libflisp-debug.a $(BUILDDIR)/support/libsupport-debug.a $(LIBUV)
 	@$(call PRINT_LINK, $(CXXLD) $(call IMPLIB_FLAGS,$@) $(JCXXFLAGS) $(JL_CXXFLAGS) $(CXXLDFLAGS) $(DEBUGFLAGS) $(DOBJS) $(RPATH_LIB) -o $@ \
 		$(JLDFLAGS) $(JLIBLDFLAGS) $(RT_DEBUG_LIBS) $(call SONAME_FLAGS,libjulia-internal-debug.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia-internal-debug.$(SHLIB_EXT) $@
@@ -393,13 +400,13 @@ libjulia-internal-release: $(build_shlibdir)/libjulia-internal.$(JL_MAJOR_MINOR_
 libjulia-internal-debug: $(build_shlibdir)/libjulia-internal-debug.$(JL_MAJOR_MINOR_SHLIB_EXT)
 libjulia-internal-debug libjulia-internal-release: $(PUBLIC_HEADER_TARGETS)
 
-$(build_shlibdir)/libjulia-codegen.$(JL_MAJOR_MINOR_SHLIB_EXT): $(SRCDIR)/julia.expmap $(CODEGEN_OBJS) $(BUILDDIR)/support/libsupport.a $(build_shlibdir)/libjulia-internal.$(JL_MAJOR_MINOR_SHLIB_EXT)
+$(build_shlibdir)/libjulia-codegen.$(JL_MAJOR_MINOR_SHLIB_EXT): $(BUILDDIR)/julia.expmap $(CODEGEN_OBJS) $(BUILDDIR)/support/libsupport.a $(build_shlibdir)/libjulia-internal.$(JL_MAJOR_MINOR_SHLIB_EXT)
 	@$(call PRINT_LINK, $(CXXLD) $(call IMPLIB_FLAGS,$@) $(JCXXFLAGS) $(JL_CXXFLAGS) $(CXXLDFLAGS) $(SHIPFLAGS) $(CODEGEN_OBJS) $(RPATH_LIB) -o $@ \
 		$(JLDFLAGS) $(JLIBLDFLAGS) $(CG_RELEASE_LIBS) $(call SONAME_FLAGS,libjulia-codegen.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia-codegen.$(SHLIB_EXT) $@
 	$(DSYMUTIL) $@
 
-$(build_shlibdir)/libjulia-codegen-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(SRCDIR)/julia.expmap $(CODEGEN_DOBJS) $(BUILDDIR)/support/libsupport-debug.a $(build_shlibdir)/libjulia-internal-debug.$(JL_MAJOR_MINOR_SHLIB_EXT)
+$(build_shlibdir)/libjulia-codegen-debug.$(JL_MAJOR_MINOR_SHLIB_EXT): $(BUILDDIR)/julia.expmap $(CODEGEN_DOBJS) $(BUILDDIR)/support/libsupport-debug.a $(build_shlibdir)/libjulia-internal-debug.$(JL_MAJOR_MINOR_SHLIB_EXT)
 	@$(call PRINT_LINK, $(CXXLD) $(call IMPLIB_FLAGS,$@) $(JCXXFLAGS) $(JL_CXXFLAGS) $(CXXLDFLAGS) $(DEBUGFLAGS) $(CODEGEN_DOBJS) $(RPATH_LIB) -o $@ \
 		$(JLDFLAGS) $(JLIBLDFLAGS) $(CG_DEBUG_LIBS) $(call SONAME_FLAGS,libjulia-codegen-debug.$(JL_MAJOR_SHLIB_EXT)))
 	@$(INSTALL_NAME_CMD)libjulia-codegen-debug.$(SHLIB_EXT) $@
@@ -429,6 +436,7 @@ clean:
 	-rm -fr $(build_shlibdir)/libjulia-internal* $(build_shlibdir)/libjulia-codegen* $(build_shlibdir)/libccalltest* $(build_shlibdir)/libllvmcalltest*
 	-rm -f $(BUILDDIR)/julia_flisp.boot $(BUILDDIR)/julia_flisp.boot.inc $(BUILDDIR)/jl_internal_funcs.inc
 	-rm -f $(BUILDDIR)/*.dbg.obj $(BUILDDIR)/*.o $(BUILDDIR)/*.dwo $(BUILDDIR)/*.$(SHLIB_EXT) $(BUILDDIR)/*.a $(BUILDDIR)/*.h.gen
+	-rm -f $(BUILDDIR)/julia.expmap
 	-rm -f $(BUILDDIR)/julia_version.h
 
 clean-flisp:

src/julia.expmap renamed to src/julia.expmap.in

@@ -1,4 +1,4 @@
-{
+@JULIA_SHLIB_SYMBOL_VERSION@ {
   global:
     pthread*;
     __stack_chk_guard;
@@ -35,13 +35,16 @@
     JLJIT*;
     llvmGetPassPluginInfo;
 
-    /* Make visible so that linker will merge duplicate definitions across DSO boundaries */
-    _ZN4llvm3Any6TypeId*;
-
     /* freebsd */
     environ;
     __progname;
 
   local:
     *;
 };
+
+@LLVM_SHLIB_SYMBOL_VERSION@ {
+  global:
+    /* Make visible so that linker will merge duplicate definitions across DSO boundaries */
+    _ZN4llvm3Any6TypeId*;
+};