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7f80f1bbf5
Summary:
The linker needs to be able to determine whether a symbol is text or data to
handle the case of a common being overridden by a strong definition in an
archive. If the archive contains a text member of the same name as the common,
that function is discarded. However, if the archive contains a data member of
the same name, that strong definition overrides the common. This is a behavior
of ld.bfd, which the Qualcomm linker also supports in LTO.
Here's a test case to illustrate:
####
cat > 1.c << \!
int blah;
!
cat > 2.c << \!
int blah() {
return 0;
}
!
cat > 3.c << \!
int blah = 20;
!
clang -c 1.c
clang -c 2.c
clang -c 3.c
ar cr lib.a 2.o 3.o
ld 1.o lib.a -t
####
The correct output is:
1.o
(lib.a)3.o
Thanks to Shankar Easwaran and Hemant Kulkarni for the test case!
Reviewers: mehdi_amini, rafael, pcc, davide
Reviewed By: pcc
Subscribers: davide, llvm-commits, inglorion
Differential Revision: https://reviews.llvm.org/D31901
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300205 91177308-0d34-0410-b5e6-96231b3b80d8
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| .. | ||
| Archive.cpp | ||
| ArchiveWriter.cpp | ||
| Binary.cpp | ||
| CMakeLists.txt | ||
| COFFObjectFile.cpp | ||
| Decompressor.cpp | ||
| ELF.cpp | ||
| ELFObjectFile.cpp | ||
| Error.cpp | ||
| IRObjectFile.cpp | ||
| IRSymtab.cpp | ||
| LLVMBuild.txt | ||
| MachOObjectFile.cpp | ||
| MachOUniversal.cpp | ||
| ModuleSummaryIndexObjectFile.cpp | ||
| ModuleSymbolTable.cpp | ||
| Object.cpp | ||
| ObjectFile.cpp | ||
| RecordStreamer.cpp | ||
| RecordStreamer.h | ||
| SymbolicFile.cpp | ||
| SymbolSize.cpp | ||
| WasmObjectFile.cpp | ||