https://sourceware.org/bugzilla/show_bug.cgi?id=21448
Bug ID: 21448
Summary: References to constant data in shared libraries bloats
2.28 executables compared to 2.27
Product: binutils
Version: 2.28
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: michael at talosis dot ca
Target Milestone: ---
Binutils 2.28 links certain executables into much larger binaries compared to
the 2.27 linker with identical input files. One practical example is in
binutils itself: "gas" is 658k for me bootstrapped, but only 226k built by
2.27.
I've figured out that the trigger is large constant data referenced from a
shared library. ld 2.28 will create a zero-filled ".data.rel.ro" section in
the executable, corresponding in size to the shared-library data item.
In the case of "gas", the table it references in libopcodes is almost twice the
size of the rest of the binary, so massive bloat occurs.
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