tree 7f262d3c51678b589ded7a2fa587c05bbce23c31
parent dbc4366c26c3ff28f66054be1ef081df870f5feb
author Fangrui Song <maskray@google.com> 1549067668 +0000
committer Fangrui Song <maskray@google.com> 1549067668 +0000

[ELF] Default to --no-allow-shlib-undefined for executables

Summary:
This follows the ld.bfd/gold behavior.

The error check is useful as it captures a common type of ld.so undefined symbol errors as link-time errors:

    // a.cc => a.so (not linked with -z defs)
    void f(); // f is undefined
    void g() { f(); }

    // b.cc => executable with a DT_NEEDED entry on a.so
    void g();
    int main() { g(); }

    // ld.so errors when g() is executed (lazy binding) or when the program is started (-z now)
    // symbol lookup error: ... undefined symbol: f

Reviewers: ruiu, grimar, pcc, espindola

Reviewed By: ruiu

Subscribers: llvm-commits, emaste, arichardson

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D57569

git-svn-id: https://llvm.org/svn/llvm-project/lld/trunk@352943 91177308-0d34-0410-b5e6-96231b3b80d8