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binutils-gdb/ld/testsuite/ld-undefined/fundef.s

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Test undefined symbols in shared libraries git commit 46434633f9 said Make undefined symbols in allocate_dynrelocs dynamic ..if they have dynamic relocs. An undefined symbol in a PIC object that finds no definition ought to become dynamic in order to support --allow-shlib-undefined, but there is nothing in the generic ELF linker code to do this if the reference isn't via the GOT or PLT. (An initialized function pointer is an example.) So it falls to backend code to ensure the symbol is made dynamic. The above isn't true. Undefined symbols are indeed made dynamic for shared libraries. Undefined symbols are not automatically made dynamic in executables, and it was the PIE case that triggered an internal consistency assertion on powerpc64. I guess I could have jumped the other way when fixing PR21988, and not created a dynamic reloc. Either way, it doesn't matter a great deal. We're going to get an error on strong undefined symbols in an executable anyway, and broken binaries if you try to use --unresolved-symbols=ignore-all to disable the error. * testsuite/ld-undefined/fundef.s: New test. * testsuite/ld-undefined/undefined.exp: Test that undefined symbols in shared libraries are made dynamic.
2017-08-24 07:56:37 +08:00
.text
.type undef_fun_typed %function
.ifdef BL
bl undef_fun_typed
nop
bl undef_fun_notype
nop
.endif
.ifdef BLPLT
bl undef_fun_typed@plt
nop
bl undef_fun_notype@plt
nop
.endif
.ifdef CALLPLT
call undef_fun_typed@plt
call undef_fun_notype@plt
.endif
.ifdef HPPA
bl undef_fun_typed,%r2
nop
bl undef_fun_notype,%r2
nop
.endif
.data
.type undef_data %object
.dc.a undef_data
.type undef_pfun %function
.dc.a undef_pfun
.dc.a undef_notype
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