Dear Vardhan, On Tue, May 18, 2010 at 08:21:21AM -0400, Vardhan, Sundara (GE Infra, Energy) wrote: > I downloaded the GCC 4.5.0 source and am compiling on AIX 6.1. The > following is the configure command used to build the make files etc > > /cots/gnu/gcc-4.5.0/configure --with-as=/usr/bin/as > --with-ld=/usr/bin/ld --enable-languages=c,c++,fortran > --prefix=/cots/gnu/gcc450 --enable-threads --disable-nls > --enable-decimal-float=dpd --with-mpfr=/cots/gnu/mpfr242 > --with-gmp=/cots/gnu/gmp501 --with-mpc=/cots/gnu/mpc081 > > Set the CONFIG_SHELL to bash and when compiled I get the following error > : > > ld: 0711-317 ERROR: Undefined symbol: .__copysignl128 > ld: 0711-317 ERROR: Undefined symbol: .__nextafterl128 > ld: 0711-317 ERROR: Undefined symbol: .__scalbnl128 > ld: 0711-317 ERROR: Undefined symbol: .__cabsl128 > ld: 0711-317 ERROR: Undefined symbol: .__cargl128 > ld: 0711-317 ERROR: Undefined symbol: .__truncl128 > ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more > information. > collect2: ld returned 8 exit status > make[3]: *** [libgfortran.la] Error 1 > make[3]: Leaving directory > `/cots/gnu/build450/powerpc-ibm-aix6.1.4.0/libgfortran' I encountered the same problem while compiling gcc-4.5.1 on AIX. The problem is that GCC tries to use the 128 bit long double functions. These are not the default on AIX (see [1]). I tried to find the library comprising the missing functions but I could not find it. A quick and dirty solution is to undefine the macro __LONGDOUBLE128, which causes the compiler to use the normal long double functions instead of the 128 bit variants. I am not sure what happens to quad precision Fortran calculations in this case, you should definitely check that first. I attached a patch that fixes compilation for me. I would be glad to hear if were successful with it. Also a GCC developer could maybe comment on a real solution to the problem. It seems that only some of the 128 bit functions are missing (or I just didn't find them with find and objdump), so we need a replacement. Anyway, the 128 bit floats on AIX are not IEEE 754 compliant (they are just two normal 64 bit floats that are added to yield a larger mantissa), so I am not sure if it actually makes sense to use those functions when strict floating point behavior is required. Cheers, [1] http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.genprogc/doc/genprogc/128bit_long_double_floating-point_datatype.htm -- Philipp Edelmann Max Planck Institute for Astrophysics Tel. +49-89-30000-2272
diff -ur gcc-4.5.1/libgfortran/generated/nearest_r16.c gcc-4.5.1-working/libgfortran/generated/nearest_r16.c --- gcc-4.5.1/libgfortran/generated/nearest_r16.c 2009-04-09 17:00:19 +0200 +++ gcc-4.5.1-working/libgfortran/generated/nearest_r16.c 2010-08-09 10:08:07 +0200 @@ -23,6 +23,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ +#undef __LONGDOUBLE128 + #include "libgfortran.h" diff -ur gcc-4.5.1/libgfortran/generated/set_exponent_r16.c gcc-4.5.1-working/libgfortran/generated/set_exponent_r16.c --- gcc-4.5.1/libgfortran/generated/set_exponent_r16.c 2009-04-09 17:00:19 +0200 +++ gcc-4.5.1-working/libgfortran/generated/set_exponent_r16.c 2010-08-09 10:08:44 +0200 @@ -23,6 +23,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ +#undef __LONGDOUBLE128 #include "libgfortran.h" diff -ur gcc-4.5.1/libgfortran/intrinsics/c99_functions.c gcc-4.5.1-working/libgfortran/intrinsics/c99_functions.c --- gcc-4.5.1/libgfortran/intrinsics/c99_functions.c 2009-07-27 11:24:41 +0200 +++ gcc-4.5.1-working/libgfortran/intrinsics/c99_functions.c 2010-08-09 09:56:17 +0200 @@ -21,6 +21,7 @@ a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ +#undef __LONGDOUBLE128 #include "config.h" diff -ur gcc-4.5.1/libgfortran/intrinsics/erfc_scaled.c gcc-4.5.1-working/libgfortran/intrinsics/erfc_scaled.c --- gcc-4.5.1/libgfortran/intrinsics/erfc_scaled.c 2009-04-09 17:00:19 +0200 +++ gcc-4.5.1-working/libgfortran/intrinsics/erfc_scaled.c 2010-08-09 10:09:10 +0200 @@ -22,6 +22,7 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ +#undef __LONGDOUBLE128 #include "libgfortran.h" /* This implementation of ERFC_SCALED is based on the netlib algorithm
