[Bug ld/22126] New: [2.29 Regression] ld --unresolved-symbols ignore-all doesn't create a reference to undefined symbols

[doko at debian dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22126

            Bug ID: 22126
           Summary: [2.29 Regression] ld --unresolved-symbols ignore-all
                    doesn't create a reference to undefined symbols
           Product: binutils
           Version: 2.29
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ld
          Assignee: unassigned at sourceware dot org
          Reporter: doko at debian dot org
  Target Milestone: ---

this is a test case from the 'adequate' testsuite trying to construct a binary
with an unresolved symbol. This worked with 2.28, and works in 2.29 on non-x86
architectures.

$ cat undef.c        
extern void this_symbol_might_be_undefined(void);

int main(int argc, char **argv)
{
        this_symbol_might_be_undefined();
        return 0;
}

$ gcc -no-pie -fno-PIE -Wl,--unresolved-symbols,ignore-all -o my-us1 undef.c 

$ nm my-us1 |grep this_symbol
                 U this_symbol_might_be_undefined

with ld 2.29, the undefined reference is not emitted, but it is emitted on arm,
aarch64, powerpc, s390x

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