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Warn on empty archive files.

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Differential Revision: https://reviews.llvm.org/D25044

llvm-svn: 282633
This commit is contained in:
Rui Ueyama 2016-09-28 21:10:54 +00:00
parent 7ae1a67ed9
commit cb85d7f840
2 changed files with 13 additions and 2 deletions
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11
lld/ELF/InputFiles.cpp
View File

@ -427,8 +427,17 @@ template <class ELFT> void ArchiveFile::parse() {
File = check(Archive::create(MB), "failed to parse archive");
// Read the symbol table to construct Lazy objects.
for (const Archive::Symbol &Sym : File->symbols())
bool IsEmpty = true;
for (const Archive::Symbol &Sym : File->symbols()) {
Symtab<ELFT>::X->addLazyArchive(this, Sym);
IsEmpty = false;
}
if (IsEmpty)
warning(getName() + " has no symbol. Chances are you are doing "
"an LTO build and forgot to use an ar command that can create "
"a symbol table for LLVM bitcode files. If so, use llvm-ar or "
"GNU ar + plugin.");
}
// Returns a buffer pointing to a member file containing a given symbol.

4
lld/test/ELF/empty-archive.s
View File

@ -1,3 +1,5 @@
// RUN: llvm-ar rc %t.a
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
// RUN: ld.lld -shared %t.o %t.a -o t
// RUN: ld.lld -shared %t.o %t.a -o t 2>&1 | FileCheck %s
// CHECK: has no symbol.