698400bfb9
When running ld -r on objects that have comdat groups, when gold deduplicates a function in a comdat group, it removes the relocations from the EH information that referred to the dropped copy of the function. When running a final link using the result of the -r link, the missing relocation cause it to fail to recognize the FDE for the dropped function. This patch improves gold's FDE scanning to take into account the possibility that an FDE corresponds to a dropped function, and drops that FDE as well. Gnu ld, on the other hand, leaves the relocations in the ld -r output, but makes them R_NONE with an r_sym field of 0. This was sufficient to let both linkers recognize the FDE properly. With this fix, if you do an ld -r with gold, then do the final link with Gnu ld, the .eh_frame_hdr section will not be generated. To make it work with Gnu ld, we would have to leave the R_NONE relocations in, but I think it's better to drop the relocations entirely. I'd hope that if you're doing a -r link with gold, you'll also do the final link with gold. gold/ PR gold/19002 * ehframe.cc (Eh_frame::read_fde): Check for dropped functions. * testsuite/Makefile.am (eh_test_2): New test. * testsuite/Makefile.in: Regenerate. * testsuite/eh_test_2.sh: New test script. * testsuite/eh_test_a.cc (bar): Make it comdat. * testsuite/eh_test_b.cc (bar): Add a duplicate copy.
33 lines
306 B
C++
33 lines
306 B
C++
#include <iostream>
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#include <cstdlib>
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void
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foo()
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{
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}
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template<typename C>
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void
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bar(C*)
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{
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}
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template
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void
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bar<int>(int*);
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int
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main()
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{
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try
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{
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throw(1);
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}
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catch(int)
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{
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std::cout << "caught" << std::endl;
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exit(0);
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}
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std::cout << "failed" << std::endl;
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exit(1);
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}
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