From 7b50823d8a4131e5a55d2499a0f5a52b3d91eed2 Mon Sep 17 00:00:00 2001 From: Drew DeVault Date: Wed, 9 Dec 2020 07:42:06 +0000 Subject: [PATCH 27/34] configure: Add --enable-autolink-libatomic, use in LINK_GCC_C_SEQUENCE_SPEC [PR81358] This fixes issues with RISC-V. --- Makefile.in | 1 + gcc/config.in | 6 ++++++ gcc/config/gnu-user.h | 12 +++++++++++- gcc/configure | 31 ++++++++++++++++++++++++++++++- gcc/configure.ac | 21 +++++++++++++++++++++ gcc/doc/install.texi | 8 ++++++++ gcc/doc/tm.texi | 8 +++++++- gcc/doc/tm.texi.in | 8 +++++++- gcc/gcc.cc | 12 +++++++++++- 9 files changed, 102 insertions(+), 5 deletions(-) diff --git a/Makefile.in b/Makefile.in index 6ff2b3f9925..394b105b271 100644 --- a/Makefile.in +++ b/Makefile.in @@ -235,6 +235,7 @@ HOST_EXPORTS = \ RANLIB_FOR_TARGET="$(RANLIB_FOR_TARGET)"; export RANLIB_FOR_TARGET; \ READELF_FOR_TARGET="$(READELF_FOR_TARGET)"; export READELF_FOR_TARGET; \ TOPLEVEL_CONFIGURE_ARGUMENTS="$(TOPLEVEL_CONFIGURE_ARGUMENTS)"; export TOPLEVEL_CONFIGURE_ARGUMENTS; \ + TARGET_CONFIGDIRS="$(TARGET_CONFIGDIRS)"; export TARGET_CONFIGDIRS; \ HOST_LIBS="$(STAGE1_LIBS)"; export HOST_LIBS; \ GMPLIBS="$(HOST_GMPLIBS)"; export GMPLIBS; \ GMPINC="$(HOST_GMPINC)"; export GMPINC; \ diff --git a/gcc/config.in b/gcc/config.in index 0679fbbf4c6..ee81139b385 100644 --- a/gcc/config.in +++ b/gcc/config.in @@ -118,6 +118,12 @@ #endif +/* Define if libatomic should always be linked. */ +#ifndef USED_FOR_TARGET +#undef ENABLE_AUTOLINK_LIBATOMIC +#endif + + /* Define to 1 to specify that we are using the BID decimal floating point format instead of DPD */ #ifndef USED_FOR_TARGET diff --git a/gcc/config/gnu-user.h b/gcc/config/gnu-user.h index b26b17f2f2a..3f64ea46180 100644 --- a/gcc/config/gnu-user.h +++ b/gcc/config/gnu-user.h @@ -109,8 +109,18 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see #define LINK_EH_SPEC "%{!static|static-pie:--eh-frame-hdr} " #endif +#if !defined(LINK_LIBATOMIC_SPEC) && defined(ENABLE_AUTOLINK_LIBATOMIC) +# ifdef LD_AS_NEEDED_OPTION +# define LINK_LIBATOMIC_SPEC LD_AS_NEEDED_OPTION " -latomic " LD_NO_AS_NEEDED_OPTION +# else +# define LINK_LIBATOMIC_SPEC "-latomic" +# endif +#elif !defined(LINK_LIBATOMIC_SPEC) +# define LINK_LIBATOMIC_SPEC "" +#endif + #define GNU_USER_TARGET_LINK_GCC_C_SEQUENCE_SPEC \ - "%{static|static-pie:--start-group} %G %{!nolibc:%L} \ + "%{static|static-pie:--start-group} %G %{!nolibc:" LINK_LIBATOMIC_SPEC " %L} \ %{static|static-pie:--end-group}%{!static:%{!static-pie:%G}}" #undef LINK_GCC_C_SEQUENCE_SPEC diff --git a/gcc/configure b/gcc/configure index e59cbee1767..787c35d4e25 100755 --- a/gcc/configure +++ b/gcc/configure @@ -984,6 +984,7 @@ with_changes_root_url enable_languages with_multilib_list with_multilib_generator +enable_autolink_libatomic with_zstd with_zstd_include with_zstd_lib @@ -1713,6 +1714,9 @@ Optional Features: --disable-shared don't provide a shared libgcc --disable-gcov don't provide libgcov and related host tools --enable-languages=LIST specify which front-ends to build + --enable-autolink-libatomic + enable automatic linking of libatomic (ignored if + not built) --disable-rpath do not hardcode runtime library paths --enable-sjlj-exceptions arrange to use setjmp/longjmp exception handling @@ -8329,7 +8333,6 @@ else fi - # Check whether --with-multilib-generator was given. if test "${with_multilib_generator+set}" = set; then : withval=$with_multilib_generator; : @@ -8337,6 +8340,32 @@ else with_multilib_generator=default fi +# If libatomic is available, whether it should be linked automatically +# Check whether --enable-autolink-libatomic was given. +if test "${enable_autolink_libatomic+set}" = set; then : + enableval=$enable_autolink_libatomic; + case $enable_autolink_libatomic in + yes | no) ;; + *) as_fn_error $? "'$enable_autolink_libatomic' is an invalid value for +--enable-autolink-libatomic. Valid choices are 'yes' and 'no'." "$LINENO" 5 ;; + esac + +else + enable_autolink_libatomic='' +fi + + +if test x$enable_autolink_libatomic = xyes; then + if echo " ${TARGET_CONFIGDIRS} " | grep " libatomic " > /dev/null 2>&1 ; then + +$as_echo "#define ENABLE_AUTOLINK_LIBATOMIC 1" >>confdefs.h + + else + { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: libatomic is not build for this target, --enable-autolink-libatomic ignored" >&5 +$as_echo "$as_me: WARNING: libatomic is not build for this target, --enable-autolink-libatomic ignored" >&2;} + fi +fi + # ------------------------- # Checks for other programs diff --git a/gcc/configure.ac b/gcc/configure.ac index 57268319de1..56bcaa87620 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -1199,6 +1199,27 @@ AC_ARG_WITH(multilib-generator, :, with_multilib_generator=default) +# If libatomic is available, whether it should be linked automatically +AC_ARG_ENABLE(autolink-libatomic, +[AS_HELP_STRING([--enable-autolink-libatomic], + [enable automatic linking of libatomic (ignored if not built)])], +[ + case $enable_autolink_libatomic in + yes | no) ;; + *) AC_MSG_ERROR(['$enable_autolink_libatomic' is an invalid value for +--enable-autolink-libatomic. Valid choices are 'yes' and 'no'.]) ;; + esac +], [enable_autolink_libatomic='']) + +if test x$enable_autolink_libatomic = xyes; then + if echo " ${TARGET_CONFIGDIRS} " | grep " libatomic " > /dev/null 2>&1 ; then + AC_DEFINE(ENABLE_AUTOLINK_LIBATOMIC, 1, + [Define if libatomic should always be linked.]) + else + AC_MSG_WARN([libatomic is not build for this target, --enable-autolink-libatomic ignored]) + fi +fi + # ------------------------- # Checks for other programs # ------------------------- diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index b30d3691fe6..ccc8e5dbb00 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -2377,6 +2377,14 @@ files, but these changed header paths may conflict with some compilation environments. Enabled by default, and may be disabled using @option{--disable-canonical-system-headers}. +@item --enable-autolink-libatomic +@itemx --disable-autolink-libatomic +Tell GCC that it should automatically link libatomic; if supported by +the linker, the file is only linked as needed. This flag is ignored +when libatomic is not built. Note that this conigure flag is in particular +useful when building an offloading-target compiler; as for those, a +user had to specify @code{-foffload=target=-latomic} otherwise. + @item --with-glibc-version=@var{major}.@var{minor} Tell GCC that when the GNU C Library (glibc) is used on the target it will be version @var{major}.@var{minor} or later. Normally this can diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi index a660e33739b..6183c407a2b 100644 --- a/gcc/doc/tm.texi +++ b/gcc/doc/tm.texi @@ -381,7 +381,13 @@ the argument @option{-lgcc} to tell the linker to do the search. @defmac LINK_GCC_C_SEQUENCE_SPEC The sequence in which libgcc and libc are specified to the linker. -By default this is @code{%G %L %G}. +By default this is @code{%G LINK_LIBATOMIC_SPEC %L %G}. +@end defmac + +@defmac LINK_LIBATOMIC_SPEC +This macro is used in the default @code{LINK_GCC_C_SEQUENCE_SPEC} to link +libatomic. By default, it is unset unless @code{ENABLE_AUTOLINK_LIBATOMIC} +is set. @end defmac @defmac POST_LINK_SPEC diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in index f7ab5d48a63..281540aba68 100644 --- a/gcc/doc/tm.texi.in +++ b/gcc/doc/tm.texi.in @@ -381,7 +381,13 @@ the argument @option{-lgcc} to tell the linker to do the search. @defmac LINK_GCC_C_SEQUENCE_SPEC The sequence in which libgcc and libc are specified to the linker. -By default this is @code{%G %L %G}. +By default this is @code{%G LINK_LIBATOMIC_SPEC %L %G}. +@end defmac + +@defmac LINK_LIBATOMIC_SPEC +This macro is used in the default @code{LINK_GCC_C_SEQUENCE_SPEC} to link +libatomic. By default, it is unset unless @code{ENABLE_AUTOLINK_LIBATOMIC} +is set. @end defmac @defmac POST_LINK_SPEC diff --git a/gcc/gcc.cc b/gcc/gcc.cc index 59390fd39d6..dae1dd4cf79 100644 --- a/gcc/gcc.cc +++ b/gcc/gcc.cc @@ -974,13 +974,23 @@ proper position among the other output files. */ # define ASM_DEBUG_OPTION_SPEC "" #endif +#if !defined(LINK_LIBATOMIC_SPEC) && defined(ENABLE_AUTOLINK_LIBATOMIC) +# ifdef LD_AS_NEEDED_OPTION +# define LINK_LIBATOMIC_SPEC LD_AS_NEEDED_OPTION " -latomic " LD_NO_AS_NEEDED_OPTION +# else +# define LINK_LIBATOMIC_SPEC "-latomic" +# endif +#elif !defined(LINK_LIBATOMIC_SPEC) +# define LINK_LIBATOMIC_SPEC "" +#endif + /* Here is the spec for running the linker, after compiling all files. */ /* This is overridable by the target in case they need to specify the -lgcc and -lc order specially, yet not require them to override all of LINK_COMMAND_SPEC. */ #ifndef LINK_GCC_C_SEQUENCE_SPEC -#define LINK_GCC_C_SEQUENCE_SPEC "%G %{!nolibc:%L %G}" +#define LINK_GCC_C_SEQUENCE_SPEC "%G %{!nolibc:" LINK_LIBATOMIC_SPEC " %L %G}" #endif #ifdef ENABLE_DEFAULT_SSP -- 2.41.0