http://sourceware.org/bugzilla/show_bug.cgi?id=14798
Bug #: 14798
Summary: gas mips target generates badly typed symbols
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: gas
AssignedTo: unassig...@sourceware.org
ReportedBy: bug...@aerifal.cx
Classification: Unclassified
Symptom: failure of -Bsymbolic-functions to resolve libgcc references at
link-time under certain circumstances. In particular, Sabotage Linux
(https://github.com/rofl0r/sabotage) ends up building a broken musl libc.so on
MIPS; its dynamic linker attempts to call libgcc functions before symbolic
relocations have been processed.
Cause: When gcc generates calls to libgcc functions for long division, etc., it
adds a .globl directive to the output asm for those functions. This is entirely
unnecessary, but should be harmless. However, the mips target for gas, upon
seeing a .globl directive, adds OBJECT type to the undefined symbol reference
unless there is a .type directive. On other targets, the type remains UNKNOWN.
This in turn prevents the linker's -Bsymbolic-functions option from resolving
the symbol reference at link-time. Assuming libgcc was compiled correctly with
visibility, these functions have hidden visibility and thus they get resolved
at link time anyway; however, if libgcc was built with --disable-shared, they
don't.
Really, this bug is an interaction of 3 separate issues in 3 pieces of
software:
1. gcc: outputting useless .globl
2. gas mips target: treating .globl as implying type==OBJECT
3. libgcc: failure to use visibility when --disable-shared is specified
I believe at least numbers 2 and 3, and maybe all three of them, should be
fixed, but only 2 pertains to binutils.
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