| http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00269.html |
| |
| On glibc the libc.so carries a copy of the math function copysignl() but |
| on uClibc math functions like copysignl() live in libm. Since libgcc_s |
| contains unresolved symbols, any attempt to link against libgcc_s |
| without explicitely specifying -lm fails, resulting in a broken |
| bootstrap of the compiler. |
| |
| |
| diff -rdup gcc-4.4.0.old/gcc/config/t-slibgcc-elf-ver gcc-4.4.0/gcc/config/t-slibgcc-elf-ver |
| --- gcc-4.4.0.old/gcc/config/t-slibgcc-elf-ver 2005-10-31 18:03:08.000000000 +0100 |
| +++ gcc-4.4.0/gcc/config/t-slibgcc-elf-ver 2008-10-07 19:28:13.000000000 +0200 |
| @@ -9,7 +9,7 @@ SHLIB_MAP = @shlib_map_file@ |
| SHLIB_OBJS = @shlib_objs@ |
| SHLIB_DIR = @multilib_dir@ |
| SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@ |
| -SHLIB_LC = -lc |
| +SHLIB_LC = @libgcc_libm@ -lc |
| |
| SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \ |
| -Wl,--soname=$(SHLIB_SONAME) \ |
| diff -rdup gcc-4.4.0.old/libgcc/configure gcc-4.4.0/libgcc/configure |
| --- gcc-4.4.0.old/libgcc/configure 2008-07-17 10:40:53.000000000 +0200 |
| +++ gcc-4.4.0/libgcc/configure 2008-10-07 19:40:48.000000000 +0200 |
| @@ -272,7 +272,7 @@ PACKAGE_STRING='GNU C Runtime Library 1. |
| PACKAGE_BUGREPORT='' |
| |
| ac_unique_file="static-object.mk" |
| -ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS libgcc_topdir enable_shared slibdir INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA AWK build build_cpu build_vendor build_os host host_cpu host_vendor host_os host_noncanonical build_libsubdir build_subdir host_subdir target_subdir AR ac_ct_AR LIPO ac_ct_LIPO NM ac_ct_NM RANLIB ac_ct_RANLIB STRIP ac_ct_STRIP LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT CPP decimal_float enable_decimal_float fixed_point vis_hide set_have_cc_tls tmake_file extra_parts asm_hidden_op LIBOBJS LTLIBOBJS' |
| +ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS libgcc_topdir enable_shared slibdir INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA AWK build build_cpu build_vendor build_os host host_cpu host_vendor host_os host_noncanonical build_libsubdir build_subdir host_subdir target_subdir AR ac_ct_AR LIPO ac_ct_LIPO NM ac_ct_NM RANLIB ac_ct_RANLIB STRIP ac_ct_STRIP LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT CPP decimal_float enable_decimal_float fixed_point vis_hide set_have_cc_tls LIBGCC_LIBM tmake_file extra_parts asm_hidden_op LIBOBJS LTLIBOBJS' |
| ac_subst_files='' |
| ac_pwd=`pwd` |
| |
| @@ -3522,6 +3522,39 @@ if test "$enable_tls $gcc_cv_have_cc_tls |
| fi |
| |
| |
| +# On powerpc libgcc_s references copysignl which is a libm function but |
| +# glibc apparently also provides it via libc as opposed to uClibc where |
| +# it lives in libm. |
| +echo "$as_me:$LINENO: checking for library containing copysignl" >&5 |
| +echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6 |
| +if test "${libgcc_cv_copysignl_lib+set}" = set; then |
| + echo $ECHO_N "(cached) $ECHO_C" >&6 |
| +else |
| + |
| + echo '#include <features.h>' > conftest.c |
| + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c |
| + libgcc_cv_copysignl_lib="-lc" |
| + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5' |
| + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 |
| + (eval $ac_try) 2>&5 |
| + ac_status=$? |
| + echo "$as_me:$LINENO: \$? = $ac_status" >&5 |
| + (exit $ac_status); }; } |
| + then |
| + libgcc_cv_copysignl_lib="-lm" |
| + fi |
| + rm -f conftest.* |
| + |
| +fi |
| +echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5 |
| +echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6 |
| + |
| +case /${libgcc_cv_copysignl_lib}/ in |
| + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;; |
| + *) LIBGCC_LIBM= ;; |
| +esac |
| + |
| + |
| # Conditionalize the makefile for this target machine. |
| tmake_file_= |
| for f in ${tmake_file} |
| @@ -4242,6 +4275,7 @@ s,@enable_decimal_float@,$enable_decimal |
| s,@fixed_point@,$fixed_point,;t t |
| s,@vis_hide@,$vis_hide,;t t |
| s,@set_have_cc_tls@,$set_have_cc_tls,;t t |
| +s,@LIBGCC_LIBM@,$LIBGCC_LIBM,;t t |
| s,@tmake_file@,$tmake_file,;t t |
| s,@extra_parts@,$extra_parts,;t t |
| s,@asm_hidden_op@,$asm_hidden_op,;t t |
| diff -rdup gcc-4.4.0.old/libgcc/configure.ac gcc-4.4.0/libgcc/configure.ac |
| --- gcc-4.4.0.old/libgcc/configure.ac 2008-07-17 10:40:53.000000000 +0200 |
| +++ gcc-4.4.0/libgcc/configure.ac 2008-10-07 19:34:48.000000000 +0200 |
| @@ -203,6 +203,27 @@ if test "$enable_tls $gcc_cv_have_cc_tls |
| fi |
| AC_SUBST(set_have_cc_tls) |
| |
| +# On powerpc libgcc_s references copysignl which is a libm function but |
| +# glibc apparently also provides it via libc as opposed to uClibc where |
| +# it lives in libm. |
| +AC_CACHE_CHECK |
| + libgcc_cv_copysignl_lib, |
| + echo '#include <features.h>' > conftest.c |
| + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c |
| + libgcc_cv_copysignl_lib="-lc" |
| + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD) |
| + then |
| + libgcc_cv_copysignl_lib="-lm" |
| + fi |
| + rm -f conftest.* |
| + ]) |
| + |
| +case /${libgcc_cv_copysignl_lib}/ in |
| + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;; |
| + *) LIBGCC_LIBM= ;; |
| +esac |
| +AC_SUBST(LIBGCC_LIBM) |
| + |
| # Conditionalize the makefile for this target machine. |
| tmake_file_= |
| for f in ${tmake_file} |
| diff -rdup gcc-4.4.0.old/libgcc/Makefile.in gcc-4.4.0/libgcc/Makefile.in |
| --- gcc-4.4.0.old/libgcc/Makefile.in 2008-07-17 10:40:53.000000000 +0200 |
| +++ gcc-4.4.0/libgcc/Makefile.in 2008-10-07 19:28:13.000000000 +0200 |
| @@ -40,6 +40,7 @@ enable_shared = @enable_shared@ |
| decimal_float = @decimal_float@ |
| enable_decimal_float = @enable_decimal_float@ |
| fixed_point = @fixed_point@ |
| +LIBGCC_LIBM = @LIBGCC_LIBM@ |
| |
| host_noncanonical = @host_noncanonical@ |
| |
| @@ -786,9 +787,10 @@ libgcc_s$(SHLIB_EXT): $(libgcc-s-objects |
| @multilib_dir@,$(MULTIDIR),$(subst \ |
| @shlib_objs@,$(objects),$(subst \ |
| @shlib_base_name@,libgcc_s,$(subst \ |
| + @libgcc_libm@,$(LIBGCC_LIBM),$(subst \ |
| @shlib_map_file@,$(mapfile),$(subst \ |
| @shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \ |
| - @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))) |
| + @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))) |
| |
| libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts) |
| # @multilib_flags@ is still needed because this may use |
