128 lines
4.4 KiB
Plaintext
128 lines
4.4 KiB
Plaintext
http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00269.html
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On glibc the libc.so carries a copy of the math function copysignl() but
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on uClibc math functions like copysignl() live in libm. Since libgcc_s
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contains unresolved symbols, any attempt to link against libgcc_s
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without explicitely specifying -lm fails, resulting in a broken
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bootstrap of the compiler.
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Forward ported to gcc 4.7.3
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Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
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diff -Nura gcc-4.7.3.orig/libgcc/config/t-slibgcc gcc-4.7.3/libgcc/config/t-slibgcc
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--- gcc-4.7.3.orig/libgcc/config/t-slibgcc 2013-04-11 15:23:46.491571116 -0300
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+++ gcc-4.7.3/libgcc/config/t-slibgcc 2013-04-11 15:25:06.241141824 -0300
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@@ -27,7 +27,7 @@
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SHLIB_OBJS = @shlib_objs@
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SHLIB_DIR = @multilib_dir@
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SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
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-SHLIB_LC = -lc
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+SHLIB_LC = @libgcc_libm@ -lc
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SHLIB_MAKE_SOLINK = $(LN_S) $(SHLIB_SONAME) $(SHLIB_DIR)/$(SHLIB_SOLINK)
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SHLIB_INSTALL_SOLINK = $(LN_S) $(SHLIB_SONAME) \
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$(DESTDIR)$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
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diff -Nura gcc-4.7.3.orig/libgcc/configure gcc-4.7.3/libgcc/configure
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--- gcc-4.7.3.orig/libgcc/configure 2013-04-11 15:23:46.551573051 -0300
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+++ gcc-4.7.3/libgcc/configure 2013-04-11 15:25:06.243141875 -0300
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@@ -563,6 +563,7 @@
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tmake_file
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sfp_machine_header
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set_use_emutls
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+LIBGCC_LIBM
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set_have_cc_tls
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vis_hide
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fixed_point
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@@ -4445,6 +4446,37 @@
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fi
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fi
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+# On powerpc libgcc_s references copysignl which is a libm function but
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+# glibc apparently also provides it via libc as opposed to uClibc where
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+# it lives in libm.
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+echo "$as_me:$LINENO: checking for library containing copysignl" >&5
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+echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6
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+if test "${libgcc_cv_copysignl_lib+set}" = set; then
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+ echo $ECHO_N "(cached) $ECHO_C" >&6
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+else
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+
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+ echo '#include <features.h>' > conftest.c
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+ echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
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+ libgcc_cv_copysignl_lib="-lc"
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+ if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5'
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+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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+ (eval $ac_try) 2>&5
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+ ac_status=$?
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+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
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+ (exit $ac_status); }; }
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+ then
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+ libgcc_cv_copysignl_lib="-lm"
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+ fi
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+ rm -f conftest.*
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+
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+fi
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+echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5
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+echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6
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+
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+case /${libgcc_cv_copysignl_lib}/ in
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+ /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
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+ *) LIBGCC_LIBM= ;;
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+esac
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# Conditionalize the makefile for this target machine.
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tmake_file_=
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diff -Nura gcc-4.7.3.orig/libgcc/configure.ac gcc-4.7.3/libgcc/configure.ac
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--- gcc-4.7.3.orig/libgcc/configure.ac 2013-04-11 15:23:46.551573051 -0300
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+++ gcc-4.7.3/libgcc/configure.ac 2013-04-11 15:25:06.244141901 -0300
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@@ -324,6 +324,27 @@
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fi
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AC_SUBST(set_have_cc_tls)
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+# On powerpc libgcc_s references copysignl which is a libm function but
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+# glibc apparently also provides it via libc as opposed to uClibc where
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+# it lives in libm.
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+AC_CACHE_CHECK
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+ libgcc_cv_copysignl_lib,
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+ echo '#include <features.h>' > conftest.c
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+ echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
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+ libgcc_cv_copysignl_lib="-lc"
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+ if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
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+ then
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+ libgcc_cv_copysignl_lib="-lm"
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+ fi
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+ rm -f conftest.*
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+ ])
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+
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+case /${libgcc_cv_copysignl_lib}/ in
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+ /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
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+ *) LIBGCC_LIBM= ;;
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+esac
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+AC_SUBST(LIBGCC_LIBM)
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+
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# See if we have emulated thread-local storage.
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GCC_CHECK_EMUTLS
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set_use_emutls=
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diff -Nura gcc-4.7.3.orig/libgcc/Makefile.in gcc-4.7.3/libgcc/Makefile.in
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--- gcc-4.7.3.orig/libgcc/Makefile.in 2013-04-11 15:23:46.537572599 -0300
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+++ gcc-4.7.3/libgcc/Makefile.in 2013-04-11 15:25:06.241141824 -0300
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@@ -41,6 +41,7 @@
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decimal_float = @decimal_float@
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enable_decimal_float = @enable_decimal_float@
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fixed_point = @fixed_point@
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+LIBGCC_LIBM = @LIBGCC_LIBM@
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host_noncanonical = @host_noncanonical@
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target_noncanonical = @target_noncanonical@
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@@ -928,9 +929,10 @@
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@multilib_dir@,$(MULTIDIR),$(subst \
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@shlib_objs@,$(objects) libgcc.a,$(subst \
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@shlib_base_name@,libgcc_s,$(subst \
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+ @libgcc_libm@,$(LIBGCC_LIBM),$(subst \
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@shlib_map_file@,$(mapfile),$(subst \
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@shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \
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- @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))
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+ @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))))
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libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
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# @multilib_flags@ is still needed because this may use
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