[Bug 268514] graphics/png: missing symbol after upgrading from 1.6.37 to 1.6.38

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268514

Tatsuki Makino <tatsuki_makino@hotmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tatsuki_makino@hotmail.com

--- Comment #5 from Tatsuki Makino <tatsuki_makino@hotmail.com> ---
(In reply to Adriaan de Groot from comment #4)

conftest.map:
VERS_1 { global: sym; local: *; }; VERS_2 { global: sym2; main; } VERS_1;

src.c:
void sym(void) {} void sym2(void) {} int main(void) {return 0;}

When such a file is prepared and the following command is executed...

clang -Wl,--version-script=conftest.map src.c
    -> This is no problem.

gcc12 -Wl,--version-script=conftest.map src.c
    -> This fails with a message like CMakeError.log of attachment 239067.

As a workaround for this,

Add -shared
    -> gcc12 -Wl,--version-script=conftest.map -shared src.c

Rewrite local:*; in VERS_1.
    -> VERS_1 { global: sym; local: foo; }; VERS_2 { global: sym2; main; }
VERS_1;
    or -> VERS_1 { global: sym; }; VERS_2 { global: sym2; main; } VERS_1;

As a result, gcc may also be treated as having version-script support
successfully.

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