[{"id":3678257,"web_url":"http://patchwork.ozlabs.org/comment/3678257/","msgid":"","list_archive_url":null,"date":"2026-04-16T15:31:57","subject":"Re: [PATCH v2] libstdc++: Add module initialization functions to the\n library [PR124268]","submitter":{"id":48004,"url":"http://patchwork.ozlabs.org/api/people/48004/","name":"Jonathan Wakely","email":"jwakely@redhat.com"},"content":"On Thu, 16 Apr 2026 at 16:20, Jonathan Wakely wrote:\n>\n> This tries to ensure that the module init functions are present in\n> libstdc++.so and libstdc++.a, so that users of the std and std.compat\n> modules don't need to manually link to std.o and/or std.compat.o in\n> addition to compiling the CMIs.\n>\n> This also adds a clean-local target to remove the generated interface\n> units and manifest, and the gcm.cache directory for the CMIs.\n>\n> This was previously committed and then reverted because it broke\n> bootstrap on a few targets. Most of the reasons the module interface\n> units failed to compile have (we believe) now been addressed with G++\n> changes, although there's still a problem on amdgcn (PR124554). Due to\n> that problem, and any not yet known problems, this version of the patch\n> tries to avoid breaking bootstrap again by allowing the modules to fail\n> to compile. If compiling std.o or std.compat.o fails then an empty\n> translation unit will be compiled and added to libstdc++.so instead.\n>\n> This means that we will only export the module initialization functions\n> from the library if the module can be compiled for the target. This\n> seems fine because we don't need to initialize anything for a module\n> that cannot even be compiled! Fixing PR124554 and removing this kluge\n> should be done for GCC 17 in stage 1.\n>\n> libstdc++-v3/ChangeLog:\n>\n> PR libstdc++/124268\n> * config/abi/pre/gnu.ver: Export symbols.\n> * src/Makefile.am: Add libmodulesconvenience.la to libstdc++\n> link.\n> * src/Makefile.in: Regenerate.\n> * src/c++23/Makefile.am: Create libmodulesconvenience.la\n> and populate it with std.o and std.compat.o interface units,\n> with empty fallback objects if compiling the interface units\n> fails. Add clean-local target.\n> * src/c++23/Makefile.in: Regenerate.\n> ---\n>\n> v2: Replace the module interface units with empty translation units if\n> they fail to compile.\n>\n> Tested x86_64-linux, sparc-solaris, aarch64-linux.\n>\n> Bootstrapped on xtensa-esp32-elf before Jakub's r16-8703 and this patch\n> allows bootstrap to complete even though std.cc fails:\n>\n> std.cc:4150:14: error: exporting 'typedef __gnuc_va_list va_list' that does not have external linkage\n> 4150 | using std::va_list;\n> | ^~~~~~~\n> : note: 'typedef struct __va_list_tag __va_list_tag' declared here with internal linkage\n> Cannot compile std module\n> Module initialization function will be missing\n\nAlso successfully bootstrapped on x86_64-unknown-freebsd16.0 which has\nthe upstream fix for the static inline fenv.h functions and on\nx86_64-unknown-freebsd14.0 which does not have the upstream fix and so\nwould have failed to compile std.cc without Nathaniel's\nr16-8488-g8b9a294a484ed5. It now compiles, and adds std.o to\nlibstdc++.so for both freebsd targets.\n\n\n\n>\n> libstdc++-v3/config/abi/pre/gnu.ver | 4 ++\n> libstdc++-v3/src/Makefile.am | 6 ++-\n> libstdc++-v3/src/Makefile.in | 6 ++-\n> libstdc++-v3/src/c++23/Makefile.am | 45 ++++++++++++++++-\n> libstdc++-v3/src/c++23/Makefile.in | 76 +++++++++++++++++++++++------\n> 5 files changed, 117 insertions(+), 20 deletions(-)\n>\n> diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver\n> index 71b3c175bbdf..bd4da6418295 100644\n> --- a/libstdc++-v3/config/abi/pre/gnu.ver\n> +++ b/libstdc++-v3/config/abi/pre/gnu.ver\n> @@ -2617,6 +2617,10 @@ GLIBCXX_3.4.35 {\n> _ZSt15__get_once_callv;\n> #endif\n>\n> + # Module inititialization symbols for std and std.compat modules.\n> + _ZGIW3std;\n> + _ZGIW3stdW6compat;\n> +\n> } GLIBCXX_3.4.34;\n>\n> # Symbols in the support library (libsupc++) have their own tag.\n> diff --git a/libstdc++-v3/src/Makefile.am b/libstdc++-v3/src/Makefile.am\n> index 55a8c88a0e12..35a497a15886 100644\n> --- a/libstdc++-v3/src/Makefile.am\n> +++ b/libstdc++-v3/src/Makefile.am\n> @@ -145,7 +145,8 @@ libstdc___la_LIBADD = \\\n> $(top_builddir)/src/c++98/libc++98convenience.la \\\n> $(top_builddir)/src/c++11/libc++11convenience.la \\\n> $(top_builddir)/src/c++17/libc++17convenience.la \\\n> - $(top_builddir)/src/c++20/libc++20convenience.la\n> + $(top_builddir)/src/c++20/libc++20convenience.la \\\n> + $(top_builddir)/src/c++23/libmodulesconvenience.la\n>\n> libstdc___la_DEPENDENCIES = \\\n> ${version_dep} \\\n> @@ -153,7 +154,8 @@ libstdc___la_DEPENDENCIES = \\\n> $(top_builddir)/src/c++98/libc++98convenience.la \\\n> $(top_builddir)/src/c++11/libc++11convenience.la \\\n> $(top_builddir)/src/c++17/libc++17convenience.la \\\n> - $(top_builddir)/src/c++20/libc++20convenience.la\n> + $(top_builddir)/src/c++20/libc++20convenience.la \\\n> + $(top_builddir)/src/c++23/libmodulesconvenience.la\n>\n> if ENABLE_DARWIN_AT_RPATH\n> libstdc___darwin_rpath = -Wc,-nodefaultrpaths\n> diff --git a/libstdc++-v3/src/Makefile.in b/libstdc++-v3/src/Makefile.in\n> index f0ad019a71fd..811d0a5ce4a8 100644\n> --- a/libstdc++-v3/src/Makefile.in\n> +++ b/libstdc++-v3/src/Makefile.in\n> @@ -555,7 +555,8 @@ libstdc___la_LIBADD = \\\n> $(top_builddir)/src/c++98/libc++98convenience.la \\\n> $(top_builddir)/src/c++11/libc++11convenience.la \\\n> $(top_builddir)/src/c++17/libc++17convenience.la \\\n> - $(top_builddir)/src/c++20/libc++20convenience.la\n> + $(top_builddir)/src/c++20/libc++20convenience.la \\\n> + $(top_builddir)/src/c++23/libmodulesconvenience.la\n>\n> libstdc___la_DEPENDENCIES = \\\n> ${version_dep} \\\n> @@ -563,7 +564,8 @@ libstdc___la_DEPENDENCIES = \\\n> $(top_builddir)/src/c++98/libc++98convenience.la \\\n> $(top_builddir)/src/c++11/libc++11convenience.la \\\n> $(top_builddir)/src/c++17/libc++17convenience.la \\\n> - $(top_builddir)/src/c++20/libc++20convenience.la\n> + $(top_builddir)/src/c++20/libc++20convenience.la \\\n> + $(top_builddir)/src/c++23/libmodulesconvenience.la\n>\n> @ENABLE_DARWIN_AT_RPATH_TRUE@libstdc___darwin_rpath = \\\n> @ENABLE_DARWIN_AT_RPATH_TRUE@ -Wc,-nodefaultrpaths \\\n> diff --git a/libstdc++-v3/src/c++23/Makefile.am b/libstdc++-v3/src/c++23/Makefile.am\n> index b031ec69576c..5b2812abd228 100644\n> --- a/libstdc++-v3/src/c++23/Makefile.am\n> +++ b/libstdc++-v3/src/c++23/Makefile.am\n> @@ -23,10 +23,13 @@\n> include $(top_srcdir)/fragment.am\n>\n> # Convenience library for C++23 runtime.\n> -noinst_LTLIBRARIES = libc++23convenience.la\n> +# This libc++23convenience.la one isn't linked into libstdc++.la yet,\n> +# so build an additional libmodulesconvenience.la which is linked in.\n> +noinst_LTLIBRARIES = libc++23convenience.la libmodulesconvenience.la\n>\n> -# Module std support. Not compiled for now, only installed.\n> +# Module std support.\n> # Let's install the interface units in the bits subdirectory.\n> +# We also compile them and include them in libmodulesconvenience.la\n> toolexeclib_DATA = libstdc++.modules.json\n> includebitsdir = $(gxx_include_dir)/bits\n> includebits_DATA = std.cc std.compat.cc\n> @@ -59,6 +62,9 @@ stamp-modules-bits: $(includebits_DATA)\n>\n> all-local: stamp-module-manifest stamp-modules-bits\n>\n> +clean-local:\n> + rm -rf stamp* libstdc++.modules.json std.cc std.compat.cc gcm.cache\n> +\n> headers =\n>\n> if ENABLE_EXTERN_TEMPLATE\n> @@ -80,12 +86,47 @@ else\n> libc__23convenience_la_SOURCES =\n> endif\n>\n> +libmodulesconvenience_la_SOURCES = std.cc std.compat.cc\n> +\n> # Use C++26 so that std::filebuf::native_handle() is available.\n> print.lo: print.cc\n> $(LTCXXCOMPILE) -std=gnu++26 -c $<\n> print.o: print.cc\n> $(CXXCOMPILE) -std=gnu++26 -c $<\n>\n> +MODULES_FLAGS = -isystem ${glibcxx_srcdir}/include/backward -fmodules \\\n> + -Wno-unknown-pragmas\n> +\n> +# These go into libmodulesconvenience.la and are linked into libstdc++\n> +std.lo: std.cc\n> + if ! $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.o: std.cc\n> + if ! $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.compat.lo: std.compat.cc std.lo\n> + if ! $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std.compat module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.compat.o: std.compat.cc std.o\n> + if ! $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std.compat module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +\n> # AM_CXXFLAGS needs to be in each subdirectory so that it can be\n> # modified in a per-library or per-sub-library way. Need to manually\n> # set this option because CONFIG_CXXFLAGS has to be after\n> diff --git a/libstdc++-v3/src/c++23/Makefile.in b/libstdc++-v3/src/c++23/Makefile.in\n> index fd9110ab8ad2..75da9c008ab6 100644\n> --- a/libstdc++-v3/src/c++23/Makefile.in\n> +++ b/libstdc++-v3/src/c++23/Makefile.in\n> @@ -133,6 +133,10 @@ AM_V_lt = $(am__v_lt_@AM_V@)\n> am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)\n> am__v_lt_0 = --silent\n> am__v_lt_1 =\n> +libmodulesconvenience_la_LIBADD =\n> +am_libmodulesconvenience_la_OBJECTS = std.lo std.compat.lo\n> +libmodulesconvenience_la_OBJECTS = \\\n> + $(am_libmodulesconvenience_la_OBJECTS)\n> AM_V_P = $(am__v_P_@AM_V@)\n> am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)\n> am__v_P_0 = false\n> @@ -159,7 +163,8 @@ AM_V_CXXLD = $(am__v_CXXLD_@AM_V@)\n> am__v_CXXLD_ = $(am__v_CXXLD_@AM_DEFAULT_V@)\n> am__v_CXXLD_0 = @echo \" CXXLD \" $@;\n> am__v_CXXLD_1 =\n> -SOURCES = $(libc__23convenience_la_SOURCES)\n> +SOURCES = $(libc__23convenience_la_SOURCES) \\\n> + $(libmodulesconvenience_la_SOURCES)\n> am__can_run_installinfo = \\\n> case $$AM_UPDATE_INFO_DIR in \\\n> n|no|NO) false;; \\\n> @@ -457,10 +462,13 @@ WARN_CXXFLAGS = \\\n> AM_CPPFLAGS = $(GLIBCXX_INCLUDES) $(CPPFLAGS)\n>\n> # Convenience library for C++23 runtime.\n> -noinst_LTLIBRARIES = libc++23convenience.la\n> +# This libc++23convenience.la one isn't linked into libstdc++.la yet,\n> +# so build an additional libmodulesconvenience.la which is linked in.\n> +noinst_LTLIBRARIES = libc++23convenience.la libmodulesconvenience.la\n>\n> -# Module std support. Not compiled for now, only installed.\n> +# Module std support.\n> # Let's install the interface units in the bits subdirectory.\n> +# We also compile them and include them in libmodulesconvenience.la\n> toolexeclib_DATA = libstdc++.modules.json\n> includebitsdir = $(gxx_include_dir)/bits\n> includebits_DATA = std.cc std.compat.cc\n> @@ -473,6 +481,10 @@ headers =\n> sources = stacktrace.cc print.cc\n> @GLIBCXX_HOSTED_FALSE@libc__23convenience_la_SOURCES =\n> @GLIBCXX_HOSTED_TRUE@libc__23convenience_la_SOURCES = $(sources) $(inst_sources)\n> +libmodulesconvenience_la_SOURCES = std.cc std.compat.cc\n> +MODULES_FLAGS = -isystem ${glibcxx_srcdir}/include/backward -fmodules \\\n> + -Wno-unknown-pragmas\n> +\n>\n> # AM_CXXFLAGS needs to be in each subdirectory so that it can be\n> # modified in a per-library or per-sub-library way. Need to manually\n> @@ -586,6 +598,9 @@ clean-noinstLTLIBRARIES:\n> libc++23convenience.la: $(libc__23convenience_la_OBJECTS) $(libc__23convenience_la_DEPENDENCIES) $(EXTRA_libc__23convenience_la_DEPENDENCIES)\n> $(AM_V_CXXLD)$(CXXLINK) $(libc__23convenience_la_OBJECTS) $(libc__23convenience_la_LIBADD) $(LIBS)\n>\n> +libmodulesconvenience.la: $(libmodulesconvenience_la_OBJECTS) $(libmodulesconvenience_la_DEPENDENCIES) $(EXTRA_libmodulesconvenience_la_DEPENDENCIES)\n> + $(AM_V_CXXLD)$(CXXLINK) $(libmodulesconvenience_la_OBJECTS) $(libmodulesconvenience_la_LIBADD) $(LIBS)\n> +\n> mostlyclean-compile:\n> -rm -f *.$(OBJEXT)\n>\n> @@ -739,8 +754,8 @@ maintainer-clean-generic:\n> @echo \"it deletes files that may require special tools to rebuild.\"\n> clean: clean-am\n>\n> -clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \\\n> - mostlyclean-am\n> +clean-am: clean-generic clean-libtool clean-local \\\n> + clean-noinstLTLIBRARIES mostlyclean-am\n>\n> distclean: distclean-am\n> -rm -f Makefile\n> @@ -809,15 +824,15 @@ uninstall-am: uninstall-includebitsDATA uninstall-toolexeclibDATA\n> .MAKE: install-am install-strip\n>\n> .PHONY: CTAGS GTAGS TAGS all all-am all-local check check-am clean \\\n> - clean-generic clean-libtool clean-noinstLTLIBRARIES \\\n> - cscopelist-am ctags ctags-am distclean distclean-compile \\\n> - distclean-generic distclean-libtool distclean-tags dvi dvi-am \\\n> - html html-am info info-am install install-am install-data \\\n> - install-data-am install-dvi install-dvi-am install-exec \\\n> - install-exec-am install-html install-html-am \\\n> - install-includebitsDATA install-info install-info-am \\\n> - install-man install-pdf install-pdf-am install-ps \\\n> - install-ps-am install-strip install-toolexeclibDATA \\\n> + clean-generic clean-libtool clean-local \\\n> + clean-noinstLTLIBRARIES cscopelist-am ctags ctags-am distclean \\\n> + distclean-compile distclean-generic distclean-libtool \\\n> + distclean-tags dvi dvi-am html html-am info info-am install \\\n> + install-am install-data install-data-am install-dvi \\\n> + install-dvi-am install-exec install-exec-am install-html \\\n> + install-html-am install-includebitsDATA install-info \\\n> + install-info-am install-man install-pdf install-pdf-am \\\n> + install-ps install-ps-am install-strip install-toolexeclibDATA \\\n> installcheck installcheck-am installdirs maintainer-clean \\\n> maintainer-clean-generic mostlyclean mostlyclean-compile \\\n> mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \\\n> @@ -855,6 +870,9 @@ stamp-modules-bits: $(includebits_DATA)\n>\n> all-local: stamp-module-manifest stamp-modules-bits\n>\n> +clean-local:\n> + rm -rf stamp* libstdc++.modules.json std.cc std.compat.cc gcm.cache\n> +\n> vpath % $(top_srcdir)/src/c++23\n>\n> # Use C++26 so that std::filebuf::native_handle() is available.\n> @@ -863,6 +881,36 @@ print.lo: print.cc\n> print.o: print.cc\n> $(CXXCOMPILE) -std=gnu++26 -c $<\n>\n> +# These go into libmodulesconvenience.la and are linked into libstdc++\n> +std.lo: std.cc\n> + if ! $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.o: std.cc\n> + if ! $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.compat.lo: std.compat.cc std.lo\n> + if ! $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std.compat module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(LTCXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +std.compat.o: std.compat.cc std.o\n> + if ! $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; then \\\n> + echo \"Cannot compile std.compat module\" >&2; \\\n> + echo \"Module initialization function will be missing\" >&2; \\\n> + echo > $<.tmp && mv $<.tmp $< && \\\n> + $(CXXCOMPILE) $(MODULES_FLAGS) -c $< ; \\\n> + fi\n> +\n> # Tell versions [3.59,3.63) of GNU make to not export all variables.\n> # Otherwise a system limit (for SysV at least) may be exceeded.\n> .NOEXPORT:\n> --\n> 2.53.0\n>","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=SaI1Mc4x;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org;\n\tdkim=pass (1024-bit key,\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=SaI1Mc4x","sourceware.org; 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