gcc6 and gcc7 fail to produce ppc64 executables: Segmentation fault

[barracuda156]

I have bumped into a weird problem with gcc6 and gcc7, initially when gcc7 failed to build icu as universal (ppc+ppc64), and it turned out compiler itself is at fault.

As an example, identical HelloWorld is built correctly for ppc64 on 10.5.8 with Apple gcc, but fails when built with gcc7:

36-225:Dev svacchanda$ gcc-mp-7 -arch ppc HelloWorld.c -o HelloWorld
HelloWorld.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main() {
 ^~~~
36-225:Dev svacchanda$ /Users/svacchanda/Dev/HelloWorld
hello, world
36-225:Dev svacchanda$ gcc-mp-7 -arch ppc64 HelloWorld.c -o HelloWorld
HelloWorld.c:2:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main() {
 ^~~~
36-225:Dev svacchanda$ /Users/svacchanda/Dev/HelloWorld
Segmentation fault
36-225:Dev svacchanda$ file /Users/svacchanda/Dev/HelloWorld
/Users/svacchanda/Dev/HelloWorld: Mach-O 64-bit executable ppc64
36-225:Dev svacchanda$ gcc -arch ppc64 HelloWorld.c -o HelloWorld
36-225:Dev svacchanda$ /Users/svacchanda/Dev/HelloWorld
hello, world
36-225:Dev svacchanda$ file /Users/svacchanda/Dev/HelloWorld
/Users/svacchanda/Dev/HelloWorld: Mach-O 64-bit executable ppc64

32-bit binaries work normally. The same problem is observed with gcc6.

P. S. At the moment I confirm the issue for Macports versions of compilers. I am building gcc7 outside of Macports now to make sure whether the problem is inherent to compiler itself and not its configuration by Macports. I have opened the ticket: https://trac.macports.org/ticket/64260

 

[barracuda156]

Outside of Macports gcc7 doesn't even build universal, failing here:

libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a libcommon.a ../libcpp/libcpp.a  -liconv ../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a  -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./isl/.libs  -lisl -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./gmp/.libs -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./mpfr/src/.libs -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./mpc/src/.libs -lmpc -lmpfr -lgmp   -L./../zlib -lz
ld: bl out of range (-19165716 max is +/-16M) from type_lists_compatible_p(tree_node const*, tree_node const*, bool*, bool*) at 0x10126E7F0 in __text_cold of c/c-typeck.o to c_build_qualified_type(tree_node*, int, tree_node*, unsigned long) at 0x100027690 in __text of  c/c-typeck.o in type_lists_compatible_p(tree_node const*, tree_node const*, bool*, bool*) from c/c-typeck.o
collect2: error: ld returned 1 exit status
make[3]: *** [cc1] Error 1
make[3]: *** Waiting for unfinished jobs....
ld: bl out of range (-19486640 max is +/-16M) from toplev::main(int, char**) at 0x1012A8B40 in __text_startup of libbackend.a(toplev.o) to hash_table_higher_prime_index(unsigned long) at 0x1000135E0 in __text of  hash-table.o in toplev::main(int, char**) from libbackend.a(toplev.o)
collect2: error: ld returned 1 exit status
make[3]: *** [cc1obj] Error 1
ld: bl out of range (-19268260 max is +/-16M) from finalization_scalarizer(gfc_symbol*, gfc_symbol*, gfc_expr*, gfc_namespace*) at 0x10133EE80 in __text_cold of fortran/class.o to gfc_get_code(gfc_exec_op)      at 0x1000DEC10 in __text of  fortran/st.o in finalization_scalarizer(gfc_symbol*, gfc_symbol*, gfc_expr*, gfc_namespace*) from fortran/class.o
collect2: error: ld returned 1 exit status
make[3]: *** [f951] Error 1
ld: bl out of range (-19401504 max is +/-16M) from mark_inline_variable(tree_node*)      at 0x1013DABE0 in __text_cold of cp/decl.o to toplevel_bindings_p()     at 0x10015A0E0 in __text of  cp/name-lookup.o in mark_inline_variable(tree_node*)      from cp/decl.o
collect2: error: ld returned 1 exit status
make[3]: *** [cc1plus] Error 1
make[2]: *** [all-stage2-gcc] Error 2
make[1]: *** [stage2-bubble] Error 2
make: *** [all] Error 2

 

[barracuda156]

Quick update: gcc6 and gcc7 are generally functional with ppc64, but there are two problems.

1. `ld64-127`, which is a default linker for 10.5 on Macports, does not work with ppc64 properly. You have to use `ld64-97` instead.

2. There is a nasty bug in gcc7 through gcc11 that make compilation of `icu` and `R` fail:

Making sure you're not a bot!

Making sure you're not a bot!

 

[barracuda156]

Outside of Macports gcc7 doesn't even build universal, failing here:

libbackend.a main.o libcommon-target.a libcommon.a ../libcpp/libcpp.a ../libdecnumber/libdecnumber.a libcommon.a ../libcpp/libcpp.a  -liconv ../libbacktrace/.libs/libbacktrace.a ../libiberty/libiberty.a ../libdecnumber/libdecnumber.a  -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./isl/.libs  -lisl -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./gmp/.libs -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./mpfr/src/.libs -L/Users/svacchanda/Dev/gcc_all/gcc-7.5.0/build/./mpc/src/.libs -lmpc -lmpfr -lgmp   -L./../zlib -lz
ld: bl out of range (-19165716 max is +/-16M) from type_lists_compatible_p(tree_node const*, tree_node const*, bool*, bool*) at 0x10126E7F0 in __text_cold of c/c-typeck.o to c_build_qualified_type(tree_node*, int, tree_node*, unsigned long) at 0x100027690 in __text of  c/c-typeck.o in type_lists_compatible_p(tree_node const*, tree_node const*, bool*, bool*) from c/c-typeck.o
collect2: error: ld returned 1 exit status
make[3]: *** [cc1] Error 1
make[3]: *** Waiting for unfinished jobs....
ld: bl out of range (-19486640 max is +/-16M) from toplev::main(int, char**) at 0x1012A8B40 in __text_startup of libbackend.a(toplev.o) to hash_table_higher_prime_index(unsigned long) at 0x1000135E0 in __text of  hash-table.o in toplev::main(int, char**) from libbackend.a(toplev.o)
collect2: error: ld returned 1 exit status
make[3]: *** [cc1obj] Error 1
ld: bl out of range (-19268260 max is +/-16M) from finalization_scalarizer(gfc_symbol*, gfc_symbol*, gfc_expr*, gfc_namespace*) at 0x10133EE80 in __text_cold of fortran/class.o to gfc_get_code(gfc_exec_op)      at 0x1000DEC10 in __text of  fortran/st.o in finalization_scalarizer(gfc_symbol*, gfc_symbol*, gfc_expr*, gfc_namespace*) from fortran/class.o
collect2: error: ld returned 1 exit status
make[3]: *** [f951] Error 1
ld: bl out of range (-19401504 max is +/-16M) from mark_inline_variable(tree_node*)

By the way, these are typical linker problems. I got the same when trying to build gcc10 in Macports on 10A190 couple of days ago (apparently default system linker failed). That is, it is not exclusive to ppc64.