Failure to build GPC under Linux

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The error messages are:

../../gcc-4.3.5/gcc/toplev.c:545:1: error: redefinition of =E2=80=98floor_l=
og2=E2=80=99
  545 | floor_log2 (unsigned HOST_WIDE_INT x)
      | ^~~~~~~~~~
In file included from ../../gcc-4.3.5/gcc/toplev.c:58:
../../gcc-4.3.5/gcc/toplev.h:177:1: note: previous definition of
=E2=80=98floor_log2=E2=80=99 wa
s here
  177 | floor_log2 (unsigned HOST_WIDE_INT x)
      | ^~~~~~~~~~
../../gcc-4.3.5/gcc/toplev.c:580:1: error: redefinition of =E2=80=98exact_l=
og2=E2=80=99
  580 | exact_log2 (unsigned HOST_WIDE_INT x)
      | ^~~~~~~~~~
In file included from ../../gcc-4.3.5/gcc/toplev.c:58:
../../gcc-4.3.5/gcc/toplev.h:183:1: note: previous definition of
=E2=80=98exact_log2=E2=80=99 wa
s here
  183 | exact_log2 (unsigned HOST_WIDE_INT x)
      | ^~~~~~~~~~

There is probably a GCC flag to allow such duplicate definitions, but I
haven't found it yet (apparently, it isn't -Wnoduplicate-decl-specifier).
I'm using the GCC 4.3.5 codebase and building with GCC 9.3.1 under Fedora
31 (x86_64).

I'm running configure as follows:

SRCDIR=3D../gcc-4.3.5
export CFLAGS =3D"-fkeep-inline-functions -W -Wall -Wwrite-strings \
                -Wstrict-prototypes -Wmissing-prototypes \
                -Wold-style-definition -Wmissing-format-attribute \
                -pedantic -Wno-long-long -Wno-variadic-macros \
                -Wno-overlength-strings -fno-common \
                -Wnoduplicate-decl-specifier"

$SRCDIR/configure --program-suffix=3D-4.3.5 --disable-shared \
                  --enable-languages=3Dpascal

The definition of CFLAGS was my attempt to allow the code to compile.  It
made no difference.

Any ideas as to how to proceed would be greatly appreciated.

John L. Ries
26215 197th Ave. SE
Covington, WA  98042
(435) 867-8885

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<div dir=3D"ltr"><div>The error messages are:</div><div><br></div><div>../.=
./gcc-4.3.5/gcc/toplev.c:545:1: error: redefinition of =E2=80=98floor_log2=
=E2=80=99<br>=C2=A0 545 | floor_log2 (unsigned HOST_WIDE_INT x)<br>=C2=A0 =
=C2=A0 =C2=A0 | ^~~~~~~~~~<br>In file included from ../../gcc-4.3.5/gcc/top=
lev.c:58:<br>../../gcc-4.3.5/gcc/toplev.h:177:1: note: previous definition =
of =E2=80=98floor_log2=E2=80=99 wa<br>s here<br>=C2=A0 177 | floor_log2 (un=
signed HOST_WIDE_INT x)<br>=C2=A0 =C2=A0 =C2=A0 | ^~~~~~~~~~<br>../../gcc-4=
.3.5/gcc/toplev.c:580:1: error: redefinition of =E2=80=98exact_log2=E2=80=
=99<br>=C2=A0 580 | exact_log2 (unsigned HOST_WIDE_INT x)<br>=C2=A0 =C2=A0 =
=C2=A0 | ^~~~~~~~~~<br>In file included from ../../gcc-4.3.5/gcc/toplev.c:5=
8:<br>../../gcc-4.3.5/gcc/toplev.h:183:1: note: previous definition of =E2=
=80=98exact_log2=E2=80=99 wa<br>s here<br>=C2=A0 183 | exact_log2 (unsigned=
 HOST_WIDE_INT x)<br>=C2=A0 =C2=A0 =C2=A0 | ^~~~~~~~~~<br></div><div><br></=
div><div>There is probably a GCC flag to allow such duplicate definitions, =
but I haven&#39;t found it yet (apparently, it isn&#39;t -Wnoduplicate-decl=
-specifier).=C2=A0 I&#39;m using the GCC 4.3.5 codebase and building with G=
CC 9.3.1 under Fedora 31 (x86_64).</div><div><br></div><div>I&#39;m running=
 configure as follows:</div><div><br></div><div>SRCDIR=3D../gcc-4.3.5<br>ex=
port CFLAGS =3D&quot;-fkeep-inline-functions -W -Wall -Wwrite-strings \<br>=
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -Wstrict-prototypes=
 -Wmissing-prototypes \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 -Wold-style-definition -Wmissing-format-attribute \<br>=C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 -pedantic -Wno-long-long -Wno=
-variadic-macros \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 -Wno-overlength-strings -fno-common \<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 -Wnoduplicate-decl-specifier&quot;<br><br>$SRCD=
IR/configure --program-suffix=3D-4.3.5 --disable-shared \<br>=C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 --enable-languages=3Dpasca=
l<br><br></div><div>The definition of CFLAGS was my attempt to allow the co=
de to compile.=C2=A0 It made no difference.<br></div><div><br></div><div>An=
y ideas as to how to proceed would be greatly appreciated. <br></div><div><=
br></div><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"=
gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><=
div><div>John L. Ries</div><div>26215 197th Ave. SE<br></div><div>Covington=
, WA=C2=A0 98042<br></div>(435) 867-8885<br></div></div></div></div></div><=
/div></div></div></div></div></div></div></div></div></div></div>

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