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Re: Building newlib without -mhard-float

Rick Mann wrote:

On Sep 5, 2007, at 8:43 AM, Jeff Johnston wrote:

These are in the gcc lib: libgcc.a You need to add a -lgcc at the end of your compile/link. If the compiler was built multilib, you will need to specify the options you used to build newlib with (e.g. -march=x -mcpu=y) as the compiler will match up a multilib libgcc.a with those options. If you are using ld directly, you will have to point to the appropriate subdirectory to find the right libgcc.a.

I already link against libgcc.a. However, it seems to lack a great many symbols. I've included the output from nm -g at the end of this message. I also included a much longer list of link errors.

I configured GCC with:

$ arm-elf-gcc -v
Using built-in specs.
Target: arm-elf
Configured with: ../configure --prefix=/usr/local/arm2 --target=arm-elf --with-cpu=xscale --with-float=soft --disable-multilib --disable-interwork --enable-languages=c,c++ --disable-nls --enable-c99 --with-newlib --enable-long-long
Thread model: single
gcc version 4.2.1

And I built newlib with:

$ ../configure --prefix=/usr/local/arm2 --target=arm-elf --disable-newlib-supplied-syscalls --enable-newlib-io-long-long --enable-newlib-multithreading --enable-newlib-io-pos-args --enable--newlib-io-long-double --disable-multilib --with-float=soft --with-cpu=xscale
$ TARGET_CFLAGS="-mcpu=xscale -msoft-float" make

I notice that libgcc2.c conditionally compiles __udivdi3() with a flag "L_udivdi3", but I don't know if that's getting set, or what controls it. Any syggestions?


My suggestion would be to back off this idea and simply build gcc and newlib without tinkering (disabling multilib and using TARGET_CFLAGS is tinkering). This should give you all the possible arm-elf permutations and the various libraries will be in sync (i.e. newlib generated code won't reference any function that isn't found in libc/libm, libgloss, or libgcc). Then, try and find one set of options that works for your target platform (e.g. arm-elf-gcc -g -mcpu=xscale -msoft-float test.c). If none of the permutations work, then it means you need to add one to gcc's list so that you get a libgcc and newlib/libgloss that are in sync and use the options you want. Adding a multilib is straightforward and has been done before.

With regards to enabling newlib long long or long double support. This shouldn't be done if the compiler doesn't support the types in all permutations. If specific permutations do support the types, then we can work from there and enable them on the fly. Newlib does not support --with-float or --with-cpu.

-- Jeff J.

Thanks so much!


Symbols missing from libgcc.a (trimmed to narrow):

----------------------------------------------------------
$ arm-elf-gcc -Wl,-Map,mapfile.txt -mcpu=xscale -ffreestanding -nostdlib -std=c99 -Xlinker --script=link.lds -o h.elf obj/start.o obj/Util.o obj/glue.o obj/lcd.o obj/main.o -lgcc -lc -lm
vfprintf.c:877: undefined reference to `__ltdf2'
vfprintf.c:1226: undefined reference to `__eqdf2'
vfprintf.c:1256: undefined reference to `__nedf2'
vfprintf.c:1135: undefined reference to `__umoddi3'
vfprintf.c:1136: undefined reference to `__udivdi3'
vfprintf.c:1382: undefined reference to `__eqdf2'
vfprintf.c:1378: undefined reference to `__nedf2'
b/dtoa.c:60: undefined reference to `__udivsi3'
dtoa.c:282: undefined reference to `__nedf2'
dtoa.c:347: undefined reference to `__floatunsidf'
dtoa.c:356: undefined reference to `__subdf3'
dtoa.c:356: undefined reference to `__muldf3'
dtoa.c:356: undefined reference to `__adddf3'
dtoa.c:356: undefined reference to `__floatsidf'
dtoa.c:356: undefined reference to `__muldf3'
dtoa.c:356: undefined reference to `__adddf3'
dtoa.c:358: undefined reference to `__fixdfsi'
dtoa.c:359: undefined reference to `__ltdf2'
dtoa.c:364: undefined reference to `__ltdf2'
dtoa.c:457: undefined reference to `__muldf3'
dtoa.c:459: undefined reference to `__divdf3'
dtoa.c:471: undefined reference to `__ltdf2'
dtoa.c:477: undefined reference to `__muldf3'
dtoa.c:480: undefined reference to `__floatsidf'
dtoa.c:480: undefined reference to `__muldf3'
dtoa.c:480: undefined reference to `__adddf3'
dtoa.c:480: undefined reference to `__floatsidf'
dtoa.c:480: undefined reference to `__muldf3'
dtoa.c:480: undefined reference to `__adddf3'
dtoa.c:485: undefined reference to `__subdf3'
dtoa.c:486: undefined reference to `__gtdf2'
dtoa.c:488: undefined reference to `__ltdf2'
dtoa.c:556: undefined reference to `__muldf3'
dtoa.c:556: undefined reference to `__gedf2'
dtoa.c:450: undefined reference to `__divdf3'
dtoa.c:498: undefined reference to `__divdf3'
dtoa.c:498: undefined reference to `__subdf3'
dtoa.c:501: undefined reference to `__fixdfsi'
dtoa.c:502: undefined reference to `__floatsidf'
dtoa.c:502: undefined reference to `__subdf3'
dtoa.c:504: undefined reference to `__gtdf2'
dtoa.c:506: undefined reference to `__subdf3'
dtoa.c:506: undefined reference to `__gtdf2'
dtoa.c:506: undefined reference to `__subdf3'
dtoa.c:506: undefined reference to `__ltdf2'
dtoa.c:510: undefined reference to `__muldf3'
dtoa.c:511: undefined reference to `__muldf3'
dtoa.c:501: undefined reference to `__fixdfsi'
dtoa.c:502: undefined reference to `__floatsidf'
dtoa.c:502: undefined reference to `__subdf3'
dtoa.c:504: undefined reference to `__ltdf2'
dtoa.c:590: undefined reference to `__muldf3'
dtoa.c:590: undefined reference to `__nedf2'
dtoa.c:562: undefined reference to `__divdf3'
dtoa.c:562: undefined reference to `__fixdfsi'
dtoa.c:563: undefined reference to `__floatsidf'
dtoa.c:563: undefined reference to `__muldf3'
dtoa.c:563: undefined reference to `__subdf3'
dtoa.c:575: undefined reference to `__adddf3'
dtoa.c:576: undefined reference to `__ltdf2'
dtoa.c:576: undefined reference to `__eqdf2'
dtoa.c:359: undefined reference to `__floatsidf'
dtoa.c:359: undefined reference to `__nedf2'
dtoa.c:518: undefined reference to `__muldf3'
dtoa.c:521: undefined reference to `__fixdfsi'
dtoa.c:522: undefined reference to `__floatsidf'
dtoa.c:522: undefined reference to `__subdf3'
dtoa.c:519: undefined reference to `__muldf3'
dtoa.c:521: undefined reference to `__fixdfsi'
dtoa.c:522: undefined reference to `__floatsidf'
dtoa.c:522: undefined reference to `__subdf3'
dtoa.c:526: undefined reference to `__adddf3'
dtoa.c:526: undefined reference to `__gtdf2'
dtoa.c:528: undefined reference to `__subdf3'
dtoa.c:528: undefined reference to `__ltdf2'
dtoa.c:463: undefined reference to `__muldf3'
dtoa.c:468: undefined reference to `__muldf3'

--------------------------------------------------------------
$ arm-elf-nm -g /usr/local/arm2/lib/gcc/arm-elf/4.2.1/libgcc.a

_udivsi3.o:
00000000 T __aeabi_uidiv
000001f0 T __aeabi_uidivmod
         U __div0
00000000 T __udivsi3

_divsi3.o:
00000000 T __aeabi_idiv
00000220 T __aeabi_idivmod
         U __div0
00000000 T __divsi3

_umodsi3.o:
         U __div0
00000000 T __umodsi3

_modsi3.o:
         U __div0
00000000 T __modsi3

_dvmd_tls.o:
00000000 T __aeabi_idiv0
00000000 T __aeabi_ldiv0
00000000 T __div0

_bb_init_func.o:

_call_via_rX.o:
0000002c T _call_via_fp
00000030 T _call_via_ip
00000038 T _call_via_lr
00000000 T _call_via_r0
00000004 T _call_via_r1
00000008 T _call_via_r2
0000000c T _call_via_r3
00000010 T _call_via_r4
00000014 T _call_via_r5
00000018 T _call_via_r6
0000001c T _call_via_r7
00000020 T _call_via_r8
00000024 T _call_via_r9
00000028 T _call_via_sl
00000034 T _call_via_sp

_interwork_call_via_rX.o:
000002b0 T .Lchange_fp
000002ec T .Lchange_ip
00000364 T .Lchange_lr
0000001c T .Lchange_r0
00000058 T .Lchange_r1
00000094 T .Lchange_r2
000000d0 T .Lchange_r3
0000010c T .Lchange_r4
00000148 T .Lchange_r5
00000184 T .Lchange_r6
000001c0 T .Lchange_r7
000001fc T .Lchange_r8
00000238 T .Lchange_r9
00000274 T .Lchange_sl
00000328 T .Lchange_sp
00000004 T _arm_return
00000010 T _arm_return_r11
00000008 T _arm_return_r7
000002ac T _interwork_call_via_fp
000002e8 T _interwork_call_via_ip
00000360 T _interwork_call_via_lr
00000018 T _interwork_call_via_r0
00000054 T _interwork_call_via_r1
00000090 T _interwork_call_via_r2
000000cc T _interwork_call_via_r3
00000108 T _interwork_call_via_r4
00000144 T _interwork_call_via_r5
00000180 T _interwork_call_via_r6
000001bc T _interwork_call_via_r7
000001f8 T _interwork_call_via_r8
00000234 T _interwork_call_via_r9
00000270 T _interwork_call_via_sl
00000324 T _interwork_call_via_sp
000002d4 T _interwork_r11_call_via_fp
00000310 T _interwork_r11_call_via_ip
00000040 T _interwork_r11_call_via_r0
0000007c T _interwork_r11_call_via_r1
000000b8 T _interwork_r11_call_via_r2
000000f4 T _interwork_r11_call_via_r3
00000130 T _interwork_r11_call_via_r4
0000016c T _interwork_r11_call_via_r5
000001a8 T _interwork_r11_call_via_r6
000001e4 T _interwork_r11_call_via_r7
00000220 T _interwork_r11_call_via_r8
0000025c T _interwork_r11_call_via_r9
00000298 T _interwork_r11_call_via_sl
0000034c T _interwork_r11_call_via_sp
000002c0 T _interwork_r7_call_via_fp
000002fc T _interwork_r7_call_via_ip
0000002c T _interwork_r7_call_via_r0
00000068 T _interwork_r7_call_via_r1
000000a4 T _interwork_r7_call_via_r2
000000e0 T _interwork_r7_call_via_r3
0000011c T _interwork_r7_call_via_r4
00000158 T _interwork_r7_call_via_r5
00000194 T _interwork_r7_call_via_r6
000001d0 T _interwork_r7_call_via_r7
0000020c T _interwork_r7_call_via_r8
00000248 T _interwork_r7_call_via_r9
00000284 T _interwork_r7_call_via_sl
00000338 T _interwork_r7_call_via_sp

_lshrdi3.o:
00000000 T __aeabi_llsr
00000000 T __lshrdi3

_ashrdi3.o:
00000000 T __aeabi_lasr
00000000 T __ashrdi3

_ashldi3.o:
00000000 T __aeabi_llsl
00000000 T __ashldi3

_negdf2.o:
00000000 T __aeabi_dneg
00000000 T __negdf2

_addsubdf3.o:
0000000c T __adddf3
0000000c T __aeabi_dadd
00000000 T __aeabi_drsub
00000008 T __aeabi_dsub
0000030c T __aeabi_f2d
000002e0 T __aeabi_i2d
00000360 T __aeabi_l2d
000002b8 T __aeabi_ui2d
0000034c T __aeabi_ul2d
0000030c T __extendsfdf2
00000360 T __floatdidf
000002e0 T __floatsidf
0000034c T __floatundidf
000002b8 T __floatunsidf
00000008 T __subdf3

_muldivdf3.o:
0000026c T __aeabi_ddiv
00000000 T __aeabi_dmul
0000026c T __divdf3
00000000 T __muldf3

_cmpdf2.o:
000000b0 T __aeabi_cdcmpeq
000000b0 T __aeabi_cdcmple
00000094 T __aeabi_cdrcmple
000000c4 T __aeabi_dcmpeq
00000100 T __aeabi_dcmpge
00000114 T __aeabi_dcmpgt
000000ec T __aeabi_dcmple
000000d8 T __aeabi_dcmplt
00000010 T __cmpdf2
00000010 T __eqdf2
00000000 T __gedf2
00000000 T __gtdf2
00000008 T __ledf2
00000008 T __ltdf2
00000010 T __nedf2

_unorddf2.o:
00000000 T __aeabi_dcmpun
00000000 T __unorddf2

_fixdfsi.o:
00000000 T __aeabi_d2iz
00000000 T __fixdfsi

_fixunsdfsi.o:
00000000 T __aeabi_d2uiz
00000000 T __fixunsdfsi

_truncdfsf2.o:
00000000 T __aeabi_d2f
00000000 T __truncdfsf2

_negsf2.o:
00000000 T __aeabi_fneg
00000000 T __negsf2

_addsubsf3.o:
0000000c T __addsf3
0000000c T __aeabi_fadd
00000000 T __aeabi_frsub
00000008 T __aeabi_fsub
000001a4 T __aeabi_i2f
000001d4 T __aeabi_l2f
0000019c T __aeabi_ui2f
000001c4 T __aeabi_ul2f
000001d4 T __floatdisf
000001a4 T __floatsisf
000001c4 T __floatundisf
0000019c T __floatunsisf
00000008 T __subsf3

_muldivsf3.o:
00000198 T __aeabi_fdiv
00000000 T __aeabi_fmul
00000198 T __divsf3
00000000 T __mulsf3

_cmpsf2.o:
00000080 T __aeabi_cfcmpeq
00000080 T __aeabi_cfcmple
00000070 T __aeabi_cfrcmple
00000094 T __aeabi_fcmpeq
000000d0 T __aeabi_fcmpge
000000e4 T __aeabi_fcmpgt
000000bc T __aeabi_fcmple
000000a8 T __aeabi_fcmplt
00000010 T __cmpsf2
00000010 T __eqsf2
00000000 T __gesf2
00000000 T __gtsf2
00000008 T __lesf2
00000008 T __ltsf2
00000010 T __nesf2

_unordsf2.o:
00000000 T __aeabi_fcmpun
00000000 T __unordsf2

_fixsfsi.o:
00000000 T __aeabi_f2iz
00000000 T __fixsfsi

_fixunssfsi.o:
00000000 T __aeabi_f2uiz
00000000 T __fixunssfsi

_floatdidf.o:

_floatdisf.o:

_floatundidf.o:

_floatundisf.o:

_muldi3.o:
00000000 T __muldi3

_negdi2.o:
00000000 T __negdi2

_cmpdi2.o:
00000000 T __cmpdi2

_ucmpdi2.o:
00000000 T __ucmpdi2

_clear_cache.o:
00000000 T __clear_cache

_enable_execute_stack.o:
00000000 T __enable_execute_stack

_trampoline.o:

__main.o:

_absvsi2.o:
00000000 T __absvsi2

_absvdi2.o:
00000000 T __absvdi2

_addvsi3.o:
00000000 T __addvsi3
         U abort

_addvdi3.o:
00000000 T __addvdi3
         U abort

_subvsi3.o:
00000000 T __subvsi3
         U abort

_subvdi3.o:
00000000 T __subvdi3
         U abort

_mulvsi3.o:
00000000 T __mulvsi3
         U abort

_mulvdi3.o:
00000000 T __mulvdi3
         U abort

_negvsi2.o:
00000000 T __negvsi2
         U abort

_negvdi2.o:
00000000 T __negvdi2
         U abort

_ctors.o:

_ffssi2.o:
         U __clz_tab
00000000 T __ffssi2

_ffsdi2.o:
         U __clz_tab
00000000 T __ffsdi2

_clz.o:
00000000 R __clz_tab

_clzsi2.o:
         U __clz_tab
00000000 T __clzsi2

_clzdi2.o:
         U __clz_tab
00000000 T __clzdi2

_ctzsi2.o:
         U __clz_tab
00000000 T __ctzsi2

_ctzdi2.o:
         U __clz_tab
00000000 T __ctzdi2

_popcount_tab.o:
00000000 R __popcount_tab

_popcountsi2.o:
         U __popcount_tab
00000000 T __popcountsi2

_popcountdi2.o:
         U __popcount_tab
00000000 T __popcountdi2

_paritysi2.o:
00000000 T __paritysi2

_paritydi2.o:
00000000 T __paritydi2

_powisf2.o:
         U __divsf3
         U __mulsf3
00000000 T __powisf2

_powidf2.o:
         U __divdf3
         U __muldf3
00000000 T __powidf2

_powixf2.o:

_powitf2.o:

_mulsc3.o:
         U __addsf3
00000000 T __mulsc3
         U __mulsf3
         U __nesf2
         U __subsf3

_muldc3.o:
         U __adddf3
00000000 T __muldc3
         U __muldf3
         U __nedf2
         U __subdf3

_mulxc3.o:

_multc3.o:

_divsc3.o:
         U __addsf3
00000000 T __divsc3
         U __divsf3
         U __eqsf2
         U __ltsf2
         U __mulsf3
         U __nesf2
         U __subsf3

_divdc3.o:
         U __adddf3
00000000 T __divdc3
         U __divdf3
         U __eqdf2
         U __ltdf2
         U __muldf3
         U __nedf2
         U __subdf3

_divxc3.o:

_divtc3.o:

_fixunsxfsi.o:

_fixsfdi.o:
00000000 T __fixsfdi
         U __fixunssfdi
         U __ltsf2

_fixunssfdi.o:
         U __adddf3
         U __extendsfdf2
         U __fixunsdfsi
00000000 T __fixunssfdi
         U __floatunsidf
         U __muldf3

_fixdfdi.o:
00000000 T __fixdfdi
         U __fixunsdfdi
         U __ltdf2

_fixunsdfdi.o:
         U __adddf3
00000000 T __fixunsdfdi
         U __fixunsdfsi
         U __floatunsidf
         U __muldf3

_fixxfdi.o:

_fixunsxfdi.o:

_floatdixf.o:

_floatundixf.o:

_fixtfdi.o:

_fixunstfdi.o:

_floatditf.o:

_floatunditf.o:

_eprintf.o:

__gcc_bcmp.o:
00000000 T __gcc_bcmp

_divdi3.o:
         U __clz_tab
00000000 T __divdi3
         U __udivsi3
         U __umodsi3

_moddi3.o:
         U __clz_tab
00000000 T __moddi3
         U __udivsi3
         U __umodsi3

_udivdi3.o:
         U __clz_tab
00000000 T __udivdi3
         U __udivsi3
         U __umodsi3

_umoddi3.o:
         U __clz_tab
         U __udivsi3
00000000 T __umoddi3
         U __umodsi3

_udiv_w_sdiv.o:
00000000 T __udiv_w_sdiv

_udivmoddi4.o:
         U __clz_tab
00000000 T __udivmoddi4
         U __udivsi3
         U __umodsi3

unwind-dw2.o:

unwind-dw2-fde.o:
00001280 T _Unwind_Find_FDE
000014cc T __deregister_frame
000014c8 T __deregister_frame_info
000013e8 T __deregister_frame_info_bases
00000f40 T __register_frame
00000118 T __register_frame_info
000000b0 T __register_frame_info_bases
00000178 T __register_frame_info_table
00000124 T __register_frame_info_table_bases
00000f20 T __register_frame_table
         U abort
         U free
         U malloc
         U strlen

unwind-sjlj.o:
00000228 T _Unwind_Backtrace
00000208 T _Unwind_DeleteException
000000bc T _Unwind_FindEnclosingFunction
00000050 T _Unwind_GetCFA
000000c4 T _Unwind_GetDataRelBase
00000040 T _Unwind_GetGR
00000070 T _Unwind_GetIP
00000080 T _Unwind_GetIPInfo
000000a8 T _Unwind_GetLanguageSpecificData
000000b4 T _Unwind_GetRegionStart
000000cc T _Unwind_GetTextRelBase
00000060 T _Unwind_SetGR
00000098 T _Unwind_SetIP
000003d0 T _Unwind_SjLj_ForcedUnwind
0000042c T _Unwind_SjLj_RaiseException
00000000 T _Unwind_SjLj_Register
00000370 T _Unwind_SjLj_Resume
00000504 T _Unwind_SjLj_Resume_or_Rethrow
00000038 T _Unwind_SjLj_Unregister
         U abort

gthr-gnat.o:
00000000 T __gnat_default_lock
00000004 T __gnat_default_unlock
00000008 T __gnat_install_locks
00000024 T __gthread_active_p
0000002c T __gthread_mutex_lock
00000048 T __gthread_mutex_unlock

unwind-c.o:
         U _Unwind_GetDataRelBase
         U _Unwind_GetIPInfo
         U _Unwind_GetLanguageSpecificData
         U _Unwind_GetRegionStart
         U _Unwind_GetTextRelBase
         U _Unwind_SetGR
         U _Unwind_SetIP
0000032c T __gcc_personality_sj0
         U abort



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