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From: "michael.haubenwallner@ssi-schaefer.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/65058] New: AIX: missing extern decorations "[DS]" for functions and "[RW]" for variables
Date: Fri, 13 Feb 2015 21:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65058

            Bug ID: 65058
           Summary: AIX: missing extern decorations "[DS]" for functions
                    and "[RW]" for variables
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: michael.haubenwallner@ssi-schaefer.com
                CC: dje at gcc dot gnu.org
            Target: powerpc-ibm-aix

With gcc-4.2, references to external functions and variables were decorated
with "[DS]" and "[RW]", respectively.

With gcc-4.8, these decorations are missing, even though ASM_OUTPUT_EXTERNAL
(xcoff.h) pretends to add them.

$ cat > extref.c <<EOF
extern int externvar;
extern void externfunc(void);

int *localvar = &externvar;
void (*localfunc)(void) = externfunc;
EOF

$ gcc-4.2.4 -S extref.c -o - | grep extern
        .long   externvar[RW]
        .long   externfunc[DS]

$ gcc-4.8.4 -S extref.c -o - | grep extern
        .long   externvar
        .long   externfunc

The latter may lead to the linker error
  ld: 0711-317 ERROR: Undefined symbol: .externfunc
in the corner case when:
*) externfunc is imported via an Import File
*) externfunc() is used as direct function call
*) externfunc is used to initialize a function pointer
*) there is some larger number of symbols to import, so no small testcase.
My particular problem is with openssh linking against the Import File
libcrypto.so(shr.imp).