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123 lines
3.9 KiB
Plaintext
123 lines
3.9 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 port to gcc 4.5.1 by Gustavo Zacarias <gustavo@zacarias.com.ar>
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---
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libgcc/Makefile.in | 4 +++-
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libgcc/configure | 32 ++++++++++++++++++++++++++++++++
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libgcc/configure.ac | 21 +++++++++++++++++++++
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3 files changed, 56 insertions(+), 1 deletion(-)
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Index: b/libgcc/Makefile.in
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===================================================================
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--- a/libgcc/Makefile.in
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+++ b/libgcc/Makefile.in
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@@ -42,6 +42,7 @@
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enable_vtable_verify = @enable_vtable_verify@
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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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@@ -943,9 +944,10 @@
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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) $(extra-parts)
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# @multilib_flags@ is still needed because this may use
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Index: b/libgcc/configure
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===================================================================
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--- a/libgcc/configure
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+++ b/libgcc/configure
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@@ -564,6 +564,7 @@
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tmake_file
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sfp_machine_header
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set_use_emutls
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+LIBGCC_LIBM
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set_have_cc_tls
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vis_hide
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fixed_point
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@@ -4535,6 +4536,37 @@
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fi
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fi
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+# On powerpc libgcc_s references copysignl which is a libm function but
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+# glibc apparently also provides it via libc as opposed to uClibc where
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+# it lives in libm.
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+echo "$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="$LIBGCC_LIBM -lm" ;;
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+ *) LIBGCC_LIBM= ;;
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+esac
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# Conditionalize the makefile for this target machine.
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tmake_file_=
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Index: b/libgcc/configure.ac
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===================================================================
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--- a/libgcc/configure.ac
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+++ b/libgcc/configure.ac
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@@ -357,6 +357,27 @@
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fi
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AC_SUBST(set_have_cc_tls)
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+# On powerpc libgcc_s references copysignl which is a libm function but
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+# glibc apparently also provides it via libc as opposed to uClibc where
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+# it lives in libm.
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+AC_CACHE_CHECK
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+ libgcc_cv_copysignl_lib,
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+ echo '#include <features.h>' > conftest.c
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+ echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
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+ libgcc_cv_copysignl_lib="-lc"
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+ if AC_TRY_COMMAND(${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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