206884bf90
This is a more full featured version of ``--allow-undefined``. The semantics of the different methods are as follows: report-all: Report all unresolved symbols. This is the default. Normally the linker will generate an error message for each reported unresolved symbol but the option ``--warn-unresolved-symbols`` can change this to a warning. ignore-all: Resolve all undefined symbols to zero. For data and function addresses this is trivial. For direct function calls, the linker will generate a trapping stub function in place of the undefined function. import-functions: Generate WebAssembly imports for any undefined functions. Undefined data symbols are resolved to zero as in `ignore-all`. This corresponds to the legacy ``--allow-undefined`` flag. The plan is to followup with a new mode called `import-dynamic` which allows for statically linked binaries to refer to both data and functions symbols from the embedder. Differential Revision: https://reviews.llvm.org/D79248
44 lines
1.3 KiB
LLVM
44 lines
1.3 KiB
LLVM
;; Test that weak undefined symbols do not fetch members from archive files.
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; RUN: llc -filetype=obj %s -o %t.o
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; RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown %p/Inputs/ret32.s -o %t.ret32.o
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; RUN: llvm-mc -filetype=obj -triple=wasm32-unknown-unknown %p/Inputs/hello.s -o %t.hello.o
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; RUN: rm -f %t.a
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; RUN: llvm-ar rcs %t.a %t.ret32.o %t.hello.o
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; RUN: wasm-ld %t.o %t.a -o %t.wasm
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; RUN: obj2yaml %t.wasm | FileCheck %s
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;; Also test with the library symbols being read first
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; RUN: wasm-ld %t.a %t.o -o %t2.wasm
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; RUN: obj2yaml %t2.wasm | FileCheck %s
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; RUN: wasm-ld -u hello_str %t.o %t.a -o %t2.wasm
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; RUN: obj2yaml %t2.wasm | FileCheck %s -check-prefix=CHECK-DATA
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target triple = "wasm32-unknown-unknown"
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; Weak external function symbol
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declare extern_weak i32 @ret32()
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; Weak external data symbol
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@hello_str = extern_weak global i8*, align 4
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define void @_start() {
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br i1 icmp ne (i8** @hello_str, i8** null), label %if.then, label %if.end
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if.then:
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%call1 = call i32 @ret32()
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br label %if.end
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if.end:
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ret void
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}
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; Ensure we have no data section. If we do, would mean that hello_str was
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; pulled out of the library.
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; CHECK-NOT: Type: DATA
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; CHECK-DATA: Type: DATA
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; CHECK: Name: 'undefined_weak:ret32'
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; CHECK-NOT: Name: ret32
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