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 ported to gcc 4.7.3
11 Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
13 diff -Nura gcc-4.7.3.orig/libgcc/config/t-slibgcc gcc-4.7.3/libgcc/config/t-slibgcc
14 --- gcc-4.7.3.orig/libgcc/config/t-slibgcc 2013-04-11 15:23:46.491571116 -0300
15 +++ gcc-4.7.3/libgcc/config/t-slibgcc 2013-04-11 15:25:06.241141824 -0300
17 SHLIB_OBJS = @shlib_objs@
18 SHLIB_DIR = @multilib_dir@
19 SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
21 +SHLIB_LC = @libgcc_libm@ -lc
22 SHLIB_MAKE_SOLINK = $(LN_S) $(SHLIB_SONAME) $(SHLIB_DIR)/$(SHLIB_SOLINK)
23 SHLIB_INSTALL_SOLINK = $(LN_S) $(SHLIB_SONAME) \
24 $(DESTDIR)$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
25 diff -Nura gcc-4.7.3.orig/libgcc/configure gcc-4.7.3/libgcc/configure
26 --- gcc-4.7.3.orig/libgcc/configure 2013-04-11 15:23:46.551573051 -0300
27 +++ gcc-4.7.3/libgcc/configure 2013-04-11 15:25:06.243141875 -0300
36 @@ -4445,6 +4446,37 @@
40 +# On powerpc libgcc_s references copysignl which is a libm function but
41 +# glibc apparently also provides it via libc as opposed to uClibc where
43 +echo "$as_me:$LINENO: checking for library containing copysignl" >&5
44 +echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6
45 +if test "${libgcc_cv_copysignl_lib+set}" = set; then
46 + echo $ECHO_N "(cached) $ECHO_C" >&6
49 + echo '#include <features.h>' > conftest.c
50 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
51 + libgcc_cv_copysignl_lib="-lc"
52 + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5'
53 + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
56 + echo "$as_me:$LINENO: \$? = $ac_status" >&5
57 + (exit $ac_status); }; }
59 + libgcc_cv_copysignl_lib="-lm"
64 +echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5
65 +echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6
67 +case /${libgcc_cv_copysignl_lib}/ in
68 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
72 # Conditionalize the makefile for this target machine.
74 diff -Nura gcc-4.7.3.orig/libgcc/configure.ac gcc-4.7.3/libgcc/configure.ac
75 --- gcc-4.7.3.orig/libgcc/configure.ac 2013-04-11 15:23:46.551573051 -0300
76 +++ gcc-4.7.3/libgcc/configure.ac 2013-04-11 15:25:06.244141901 -0300
79 AC_SUBST(set_have_cc_tls)
81 +# On powerpc libgcc_s references copysignl which is a libm function but
82 +# glibc apparently also provides it via libc as opposed to uClibc where
85 + libgcc_cv_copysignl_lib,
86 + echo '#include <features.h>' > conftest.c
87 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
88 + libgcc_cv_copysignl_lib="-lc"
89 + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
91 + libgcc_cv_copysignl_lib="-lm"
96 +case /${libgcc_cv_copysignl_lib}/ in
97 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
100 +AC_SUBST(LIBGCC_LIBM)
102 # See if we have emulated thread-local storage.
105 diff -Nura gcc-4.7.3.orig/libgcc/Makefile.in gcc-4.7.3/libgcc/Makefile.in
106 --- gcc-4.7.3.orig/libgcc/Makefile.in 2013-04-11 15:23:46.537572599 -0300
107 +++ gcc-4.7.3/libgcc/Makefile.in 2013-04-11 15:25:06.241141824 -0300
109 decimal_float = @decimal_float@
110 enable_decimal_float = @enable_decimal_float@
111 fixed_point = @fixed_point@
112 +LIBGCC_LIBM = @LIBGCC_LIBM@
114 host_noncanonical = @host_noncanonical@
115 target_noncanonical = @target_noncanonical@
117 @multilib_dir@,$(MULTIDIR),$(subst \
118 @shlib_objs@,$(objects) libgcc.a,$(subst \
119 @shlib_base_name@,libgcc_s,$(subst \
120 + @libgcc_libm@,$(LIBGCC_LIBM),$(subst \
121 @shlib_map_file@,$(mapfile),$(subst \
122 @shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \
123 - @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))
124 + @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))))
126 libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
127 # @multilib_flags@ is still needed because this may use