1 http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00269.html
3 On glibc the libc.so carries a copy of the math function copysignl() but
4 on uClibc math functions like copysignl() live in libm. Since libgcc_s
5 contains unresolved symbols, any attempt to link against libgcc_s
6 without explicitely specifying -lm fails, resulting in a broken
7 bootstrap of the compiler.
10 diff -rdup gcc-4.4.0.old/gcc/config/t-slibgcc-elf-ver gcc-4.4.0/gcc/config/t-slibgcc-elf-ver
12 diff -durN gcc-4.4.4.orig/gcc/config/t-slibgcc-elf-ver gcc-4.4.4/gcc/config/t-slibgcc-elf-ver
13 --- gcc-4.4.4.orig/gcc/config/t-slibgcc-elf-ver 2010-01-04 16:13:08.000000000 +0100
14 +++ gcc-4.4.4/gcc/config/t-slibgcc-elf-ver 2010-05-16 19:38:36.000000000 +0200
16 SHLIB_OBJS = @shlib_objs@
17 SHLIB_DIR = @multilib_dir@
18 SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
20 +SHLIB_LC = @libgcc_libm@ -lc
21 SHLIB_MAKE_SOLINK = $(LN_S) $(SHLIB_SONAME) $(SHLIB_DIR)/$(SHLIB_SOLINK)
22 SHLIB_INSTALL_SOLINK = $(LN_S) $(SHLIB_SONAME) \
23 $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
24 diff -durN gcc-4.4.4.orig/libgcc/Makefile.in gcc-4.4.4/libgcc/Makefile.in
25 --- gcc-4.4.4.orig/libgcc/Makefile.in 2009-04-10 01:23:07.000000000 +0200
26 +++ gcc-4.4.4/libgcc/Makefile.in 2010-05-16 19:38:36.000000000 +0200
28 decimal_float = @decimal_float@
29 enable_decimal_float = @enable_decimal_float@
30 fixed_point = @fixed_point@
31 +LIBGCC_LIBM = @LIBGCC_LIBM@
33 host_noncanonical = @host_noncanonical@
36 @multilib_dir@,$(MULTIDIR),$(subst \
37 @shlib_objs@,$(objects),$(subst \
38 @shlib_base_name@,libgcc_s,$(subst \
39 + @libgcc_libm@,$(LIBGCC_LIBM),$(subst \
40 @shlib_map_file@,$(mapfile),$(subst \
41 @shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \
42 - @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))
43 + @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))))
45 libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
46 # @multilib_flags@ is still needed because this may use
47 diff -durN gcc-4.4.4.orig/libgcc/configure gcc-4.4.4/libgcc/configure
48 --- gcc-4.4.4.orig/libgcc/configure 2008-11-20 18:13:01.000000000 +0100
49 +++ gcc-4.4.4/libgcc/configure 2010-05-16 19:38:36.000000000 +0200
53 ac_unique_file="static-object.mk"
54 -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'
55 +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'
59 @@ -3547,6 +3547,39 @@
63 +# On powerpc libgcc_s references copysignl which is a libm function but
64 +# glibc apparently also provides it via libc as opposed to uClibc where
66 +echo "$as_me:$LINENO: checking for library containing copysignl" >&5
67 +echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6
68 +if test "${libgcc_cv_copysignl_lib+set}" = set; then
69 + echo $ECHO_N "(cached) $ECHO_C" >&6
72 + echo '#include <features.h>' > conftest.c
73 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
74 + libgcc_cv_copysignl_lib="-lc"
75 + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5'
76 + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
79 + echo "$as_me:$LINENO: \$? = $ac_status" >&5
80 + (exit $ac_status); }; }
82 + libgcc_cv_copysignl_lib="-lm"
87 +echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5
88 +echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6
90 +case /${libgcc_cv_copysignl_lib}/ in
91 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
96 # Conditionalize the makefile for this target machine.
98 for f in ${tmake_file}
100 s,@fixed_point@,$fixed_point,;t t
101 s,@vis_hide@,$vis_hide,;t t
102 s,@set_have_cc_tls@,$set_have_cc_tls,;t t
103 +s,@LIBGCC_LIBM@,$LIBGCC_LIBM,;t t
104 s,@tmake_file@,$tmake_file,;t t
105 s,@extra_parts@,$extra_parts,;t t
106 s,@asm_hidden_op@,$asm_hidden_op,;t t
107 diff -durN gcc-4.4.4.orig/libgcc/configure.ac gcc-4.4.4/libgcc/configure.ac
108 --- gcc-4.4.4.orig/libgcc/configure.ac 2008-11-20 18:13:01.000000000 +0100
109 +++ gcc-4.4.4/libgcc/configure.ac 2010-05-16 19:38:36.000000000 +0200
112 AC_SUBST(set_have_cc_tls)
114 +# On powerpc libgcc_s references copysignl which is a libm function but
115 +# glibc apparently also provides it via libc as opposed to uClibc where
118 + libgcc_cv_copysignl_lib,
119 + echo '#include <features.h>' > conftest.c
120 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
121 + libgcc_cv_copysignl_lib="-lc"
122 + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
124 + libgcc_cv_copysignl_lib="-lm"
129 +case /${libgcc_cv_copysignl_lib}/ in
130 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
133 +AC_SUBST(LIBGCC_LIBM)
135 # Conditionalize the makefile for this target machine.
137 for f in ${tmake_file}