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clang-cl: Don't check for existence of linker inputs when /link is used 

There might be flags passed to the linker (e.g. /libpath), causing it
to search in paths the Clang driver doesn't know about.

PR27234

llvm-svn: 266402
This commit is contained in:
Hans Wennborg 2016-04-15 01:12:32 +00:00
parent 987c8788d4
commit 12f4f8be90
2 changed files with 24 additions and 7 deletions
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19
clang/lib/Driver/Driver.cpp
View File

@ -1115,7 +1115,7 @@ void Driver::BuildUniversalActions(Compilation &C, const ToolChain &TC,
/// \brief Check that the file referenced by Value exists. If it doesn't,
/// issue a diagnostic and return false.
static bool DiagnoseInputExistence(const Driver &D, const DerivedArgList &Args,
StringRef Value) {
StringRef Value, types::ID Ty) {
if (!D.getCheckInputsExist())
return true;
@ -1135,10 +1135,19 @@ static bool DiagnoseInputExistence(const Driver &D, const DerivedArgList &Args,
if (llvm::sys::fs::exists(Twine(Path)))
return true;
if (D.IsCLMode() && !llvm::sys::path::is_absolute(Twine(Path)) &&
if (D.IsCLMode()) {
if (!llvm::sys::path::is_absolute(Twine(Path)) &&
llvm::sys::Process::FindInEnvPath("LIB", Value))
return true;
if (Args.hasArg(options::OPT__SLASH_link) && Ty == types::TY_Object) {
// Arguments to the /link flag might cause the linker to search for object
// and library files in paths we don't know about. Don't error in such
// cases.
return true;
}
}
D.Diag(clang::diag::err_drv_no_such_file) << Path;
return false;
}
@ -1253,19 +1262,19 @@ void Driver::BuildInputs(const ToolChain &TC, DerivedArgList &Args,
}
}
if (DiagnoseInputExistence(*this, Args, Value))
if (DiagnoseInputExistence(*this, Args, Value, Ty))
Inputs.push_back(std::make_pair(Ty, A));
} else if (A->getOption().matches(options::OPT__SLASH_Tc)) {
StringRef Value = A->getValue();
if (DiagnoseInputExistence(*this, Args, Value)) {
if (DiagnoseInputExistence(*this, Args, Value, types::TY_C)) {
Arg *InputArg = MakeInputArg(Args, Opts, A->getValue());
Inputs.push_back(std::make_pair(types::TY_C, InputArg));
}
A->claim();
} else if (A->getOption().matches(options::OPT__SLASH_Tp)) {
StringRef Value = A->getValue();
if (DiagnoseInputExistence(*this, Args, Value)) {
if (DiagnoseInputExistence(*this, Args, Value, types::TY_CXX)) {
Arg *InputArg = MakeInputArg(Args, Opts, A->getValue());
Inputs.push_back(std::make_pair(types::TY_CXX, InputArg));
}

8
clang/test/Driver/cl-link.c
View File

@ -43,3 +43,11 @@
// RUN: %clang_cl /Zi /Tc%s -### 2>&1 | FileCheck --check-prefix=DEBUG %s
// DEBUG: link.exe
// DEBUG: "-debug"
// PR27234
// RUN: %clang_cl /Tc%s nonexistent.obj -### /link /libpath:somepath 2>&1 | FileCheck --check-prefix=NONEXISTENT %s
// RUN: %clang_cl /Tc%s nonexistent.lib -### /link /libpath:somepath 2>&1 | FileCheck --check-prefix=NONEXISTENT %s
// NONEXISTENT-NOT: no such file
// NONEXISTENT: link.exe
// NONEXISTENT: "/libpath:somepath"
// NONEXISTENT: nonexistent