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13 Date: Tue, 7 Oct 2008 20:10:19 +0200
14 From: Bernhard Reutner-Fischer <rep dot dot dot nop at gmail dot com>
15 To: Ian Lance Taylor <iant at google dot com>
16 Cc: gcc-patches at gcc dot gnu dot org
17 Subject: Re: [PATCH] link libgcc_s.so against a lib containing copysignl on powerpc-*-linux-uclibc
18 Message-ID: <20081007181019.GB5178@mx.loc>
19 References: <20081007141721.GG9250@mx.loc> <m33aj82wcc.fsf@google.com>
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39 On Tue, Oct 07, 2008 at 09:39:31AM -0700, Ian Lance Taylor wrote:
40 >Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> writes:
44 >> 2008-10-07 Bernhard Reutner-Fischer <>
46 >> * config/t-slibgcc-elf-ver (SHLIB_LC): Also link against
51 >> 2008-10-07 Bernhard Reutner-Fischer <>
53 >> * configure.ac (libgcc_cv_copysignl_lib, LIBGCC_LIBM): New
54 >> variables to denote if we are on powerpc-uclibc where libm
55 >> functions live in libm.
56 >> * Makefile.in (LIBGCC_LIBM): Set.
57 >> (libgcc_s$(SHLIB_EXT)): Substitute @libgcc_libm@ with
59 >> * (configure): Regenerate.
62 >> +# On powerpc libgcc_s references copysignl which is a libm function but
63 >> +# glibc apparently also provides it via libc as opposed to uClibc where
64 >> +# it lives in libm.
65 >> +dnl save_LIBS="$LIBS"
67 >> +dnl AC_SEARCH_LIBS(copysignl, m)
68 >> +dnl LIBGCC_LIBS="$LIBS"
69 >> +dnl LIBS="$save_LIBS"
70 >> +dnl AC_SUBST(LIBGCC_LIBS)
72 >Why don't you run these commands listed as dnl?
74 I don't have a working compiler here yet and GCC_NO_EXECUTABLES. I can
75 only assemble, not link (we're about to build the libgcc for the
78 >> +AC_CACHE_CHECK([for library containing copysignl],
79 >> + libgcc_cv_copysignl_lib, [
80 >> + echo '#include <features.h>' > conftest.c
81 >> + case $target_alias in
83 >> + echo 'int the_libc = __UCLIBC__;' >> conftest.c
86 >> + echo 'int the_libc; /* dummy */' >> conftest.c
89 >> + libgcc_cv_copysignl_lib="-lc"
90 >> + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
92 >> + libgcc_cv_copysignl_lib="-lm"
95 >AC_TRY_COMMAND is not part of the documented set of autoconf
96 >commands. And this test seems reversed: shouldn't you add -lm if
97 >AC_TRY_COMMAND fails?
99 AC_TRY_COMMAND is used in the same file to check visibility support.
100 An alternative would be to run nm(1), but for that i need to know the
101 location of libc and libm so AC_TRY_COMMAND was easier.
103 The test is supposed to
104 - pass only on powerpc-*-*-uclibc*
106 so yes, that isn't quite right and should drop the case statement and
107 check something like __UCLIBC__ + __powerpc__ instead (or use #if
108 !defined\n#else\n#error glibm\n#endif but that would be more echo
112 >I don't see any reason to write shell code that tests $target_alias
116 >(and shouldn't it be $host_alias anyhow)? Just write C code that does
119 It can't be the host_alias, we can as well build either a
120 build=host=i386,target=ppc (cross-compiler) or a
121 build=i386,host=target=ppc ("native" compiler, cross-compiled).
123 >The basic idea seems fine, though.
125 Thanks. I'm attaching an updated patch, ChangeLog remains the same.
129 Content-Type: text/x-diff; charset=us-ascii
130 Content-Disposition: attachment; filename="820-powerpc-softfloat-libm_for_copysignl.patch"
132 diff -rdup gcc-4.4.0.old/gcc/config/t-slibgcc-elf-ver gcc-4.4.0/gcc/config/t-slibgcc-elf-ver
133 --- gcc-4.4.0.old/gcc/config/t-slibgcc-elf-ver 2005-10-31 18:03:08.000000000 +0100
134 +++ gcc-4.4.0/gcc/config/t-slibgcc-elf-ver 2008-10-07 19:28:13.000000000 +0200
135 @@ -9,7 +9,7 @@ SHLIB_MAP = @shlib_map_file@
136 SHLIB_OBJS = @shlib_objs@
137 SHLIB_DIR = @multilib_dir@
138 SHLIB_SLIBDIR_QUAL = @shlib_slibdir_qual@
140 +SHLIB_LC = @libgcc_libm@ -lc
142 SHLIB_LINK = $(GCC_FOR_TARGET) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \
143 -Wl,--soname=$(SHLIB_SONAME) \
144 diff -rdup gcc-4.4.0.old/libgcc/configure gcc-4.4.0/libgcc/configure
145 --- gcc-4.4.0.old/libgcc/configure 2008-07-17 10:40:53.000000000 +0200
146 +++ gcc-4.4.0/libgcc/configure 2008-10-07 19:40:48.000000000 +0200
147 @@ -272,7 +272,7 @@ PACKAGE_STRING='GNU C Runtime Library 1.
150 ac_unique_file="static-object.mk"
151 -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'
152 +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'
156 @@ -3522,6 +3522,39 @@ if test "$enable_tls $gcc_cv_have_cc_tls
160 +# On powerpc libgcc_s references copysignl which is a libm function but
161 +# glibc apparently also provides it via libc as opposed to uClibc where
163 +echo "$as_me:$LINENO: checking for library containing copysignl" >&5
164 +echo $ECHO_N "checking for library containing copysignl... $ECHO_C" >&6
165 +if test "${libgcc_cv_copysignl_lib+set}" = set; then
166 + echo $ECHO_N "(cached) $ECHO_C" >&6
169 + echo '#include <features.h>' > conftest.c
170 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
171 + libgcc_cv_copysignl_lib="-lc"
172 + if { ac_try='${CC-cc} -S conftest.c -o conftest.s 1>&5'
173 + { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
174 + (eval $ac_try) 2>&5
176 + echo "$as_me:$LINENO: \$? = $ac_status" >&5
177 + (exit $ac_status); }; }
179 + libgcc_cv_copysignl_lib="-lm"
184 +echo "$as_me:$LINENO: result: $libgcc_cv_copysignl_lib" >&5
185 +echo "${ECHO_T}$libgcc_cv_copysignl_lib" >&6
187 +case /${libgcc_cv_copysignl_lib}/ in
188 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
193 # Conditionalize the makefile for this target machine.
195 for f in ${tmake_file}
196 @@ -4242,6 +4275,7 @@ s,@enable_decimal_float@,$enable_decimal
197 s,@fixed_point@,$fixed_point,;t t
198 s,@vis_hide@,$vis_hide,;t t
199 s,@set_have_cc_tls@,$set_have_cc_tls,;t t
200 +s,@LIBGCC_LIBM@,$LIBGCC_LIBM,;t t
201 s,@tmake_file@,$tmake_file,;t t
202 s,@extra_parts@,$extra_parts,;t t
203 s,@asm_hidden_op@,$asm_hidden_op,;t t
204 diff -rdup gcc-4.4.0.old/libgcc/configure.ac gcc-4.4.0/libgcc/configure.ac
205 --- gcc-4.4.0.old/libgcc/configure.ac 2008-07-17 10:40:53.000000000 +0200
206 +++ gcc-4.4.0/libgcc/configure.ac 2008-10-07 19:34:48.000000000 +0200
207 @@ -203,6 +203,27 @@ if test "$enable_tls $gcc_cv_have_cc_tls
209 AC_SUBST(set_have_cc_tls)
211 +# On powerpc libgcc_s references copysignl which is a libm function but
212 +# glibc apparently also provides it via libc as opposed to uClibc where
214 +AC_CACHE_CHECK([for library containing copysignl],
215 + libgcc_cv_copysignl_lib, [
216 + echo '#include <features.h>' > conftest.c
217 + echo 'int the_libc = __UCLIBC__ + __powerpc__;' >> conftest.c
218 + libgcc_cv_copysignl_lib="-lc"
219 + if AC_TRY_COMMAND(${CC-cc} -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD)
221 + libgcc_cv_copysignl_lib="-lm"
226 +case /${libgcc_cv_copysignl_lib}/ in
227 + /-lm/) LIBGCC_LIBM="$LIBGCC_LIBM -lm" ;;
230 +AC_SUBST(LIBGCC_LIBM)
232 # Conditionalize the makefile for this target machine.
234 for f in ${tmake_file}
235 diff -rdup gcc-4.4.0.old/libgcc/Makefile.in gcc-4.4.0/libgcc/Makefile.in
236 --- gcc-4.4.0.old/libgcc/Makefile.in 2008-07-17 10:40:53.000000000 +0200
237 +++ gcc-4.4.0/libgcc/Makefile.in 2008-10-07 19:28:13.000000000 +0200
238 @@ -40,6 +40,7 @@ enable_shared = @enable_shared@
239 decimal_float = @decimal_float@
240 enable_decimal_float = @enable_decimal_float@
241 fixed_point = @fixed_point@
242 +LIBGCC_LIBM = @LIBGCC_LIBM@
244 host_noncanonical = @host_noncanonical@
246 @@ -786,9 +787,10 @@ libgcc_s$(SHLIB_EXT): $(libgcc-s-objects
247 @multilib_dir@,$(MULTIDIR),$(subst \
248 @shlib_objs@,$(objects),$(subst \
249 @shlib_base_name@,libgcc_s,$(subst \
250 + @libgcc_libm@,$(LIBGCC_LIBM),$(subst \
251 @shlib_map_file@,$(mapfile),$(subst \
252 @shlib_slibdir_qual@,$(MULTIOSSUBDIR),$(subst \
253 - @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK))))))))
254 + @shlib_slibdir@,$(shlib_slibdir),$(SHLIB_LINK)))))))))
256 libunwind$(SHLIB_EXT): $(libunwind-s-objects) $(extra-parts)
257 # @multilib_flags@ is still needed because this may use