https://sourceware.org/bugzilla/show_bug.cgi?id=17350
Bug ID: 17350
Summary: ld cannot handle .init_array mixed with comdat
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: rafael.espindola at gmail dot com
Created attachment 7770
--> https://sourceware.org/bugzilla/attachment.cgi?id=7770&action=edit
testcase
The attached testcase has a .init_array that is in a comdat.
With gold
$ ~/binutils/build/gold/ld-new -shared -o test.so test.o
$ readelf -x .init_array test.so
Hex dump of section '.init_array':
0x00001468 90020000 00000000 ........
$ readelf -sDW test.so | grep FUNC
1 0: 0000000000000290 1 FUNC WEAK DEFAULT 7 f
That is, .init_array points to the function f, as expected.
With bfd ld:
$ ~/binutils/build/ld/ld-new -shared -o test.so test.o
[espindola@localhost llvm]$ readelf -x .init_array test.so
Hex dump of section '.init_array':
0x00200268 00000000 00000000 ........
The section has a null.
As to why this is useful: In C++ when doing static initialization of a variable
in a comdat we can put the .init_array in that comdat. That way the linker
should keep only one copy.
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