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.
9 Forward port to gcc 4.5.1 by Gustavo Zacarias <gustavo@zacarias.com.ar>
11 diff -Nura gcc-4.5.1.orig/gcc/config/t-slibgcc-elf-ver gcc-4.5.1/gcc/config/t-slibgcc-elf-ver
12 --- gcc-4.5.1.orig/gcc/config/t-slibgcc-elf-ver 2010-11-03 14:35:08.644904042 -0300
13 +++ gcc-4.5.1/gcc/config/t-slibgcc-elf-ver 2010-11-03 14:35:56.332904024 -0300
15 SHLIB_OBJS = @shlib_objs@
16 SHLIB_DIR = @multilib_dir@
17 SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
19 +SHLIB_LC = @libgcc_libm@ -lc
20 SHLIB_MAKE_SOLINK = $(LN_S) $(SHLIB_SONAME) $(SHLIB_DIR)/$(SHLIB_SOLINK)
21 SHLIB_INSTALL_SOLINK = $(LN_S) $(SHLIB_SONAME) \
22 $$(DESTDIR)$$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
23 diff -Nura gcc-4.5.1.orig/libgcc/Makefile.in gcc-4.5.1/libgcc/Makefile.in
24 --- gcc-4.5.1.orig/libgcc/Makefile.in 2010-11-03 14:32:44.272904042 -0300
25 +++ gcc-4.5.1/libgcc/Makefile.in 2010-11-03 14:37:03.893904042 -0300
27 decimal_float = @decimal_float@
28 enable_decimal_float = @enable_decimal_float@
29 fixed_point = @fixed_point@
30 +LIBGCC_LIBM = @LIBGCC_LIBM@
32 host_noncanonical = @host_noncanonical@
35 @multilib_dir@,$(MULTIDIR),$(subst \
36 @shlib_objs@,$(objects),$(subst \
37 @shlib_base_name@,libgcc_s,$(subst \
38 + @libgcc_libm@,$(LIBGCC_LIBM),$(subst \
39 @shlib_map_file@,$(mapfile),$(subst \
40 @shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \
41 - @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))
42 + @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))))
44 libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
45 # @multilib_flags@ is still needed because this may use
46 diff -Nura gcc-4.5.1.orig/libgcc/configure gcc-4.5.1/libgcc/configure
47 --- gcc-4.5.1.orig/libgcc/configure 2010-11-03 14:32:44.283904042 -0300
48 +++ gcc-4.5.1/libgcc/configure 2010-11-03 14:39:48.685904042 -0300
57 @@ -3847,6 +3848,37 @@
58 set_use_emutls="-DUSE_EMUTLS"
61 +# On powerpc libgcc_s references copysignl which is a libm function but
62 +# glibc apparently also provides it via libc as opposed to uClibc where
64 +echo "$as_me:$LINENO: checking for library containing copysignl" >&5
65 +echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6
66 +if test "${libgcc_cv_copysignl_lib+set}" = set; then
67 + echo $ECHO_N "(cached) $ECHO_C" >&6
70 + echo '#include <features.h>' > conftest.c
71 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
72 + libgcc_cv_copysignl_lib="-lc"
73 + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5'
74 + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
77 + echo "$as_me:$LINENO: \$? = $ac_status" >&5
78 + (exit $ac_status); }; }
80 + libgcc_cv_copysignl_lib="-lm"
85 +echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5
86 +echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6
88 +case /${libgcc_cv_copysignl_lib}/ in
89 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
93 # Conditionalize the makefile for this target machine.
95 diff -Nura gcc-4.5.1.orig/libgcc/configure.ac gcc-4.5.1/libgcc/configure.ac
96 --- gcc-4.5.1.orig/libgcc/configure.ac 2010-11-03 14:32:44.735904042 -0300
97 +++ gcc-4.5.1/libgcc/configure.ac 2010-11-03 14:42:11.278904045 -0300
100 AC_SUBST(set_have_cc_tls)
102 +# On powerpc libgcc_s references copysignl which is a libm function but
103 +# glibc apparently also provides it via libc as opposed to uClibc where
106 + libgcc_cv_copysignl_lib,
107 + echo '#include <features.h>' > conftest.c
108 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
109 + libgcc_cv_copysignl_lib="-lc"
110 + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
112 + libgcc_cv_copysignl_lib="-lm"
117 +case /${libgcc_cv_copysignl_lib}/ in
118 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
121 +AC_SUBST(LIBGCC_LIBM)
123 # See if we have emulated thread-local storage.