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[clang][modules] Ensure -nostdlib causes no manifest to be reported #161110

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Merged
merged 1 commit into from
Sep 29, 2025
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[clang][modules] Ensure -nostdlib causes no manifest to be reported #161110

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3 changes: 3 additions & 0 deletions clang/lib/Driver/Driver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6613,6 +6613,9 @@ std::string Driver::GetStdModuleManifestPath(const Compilation &C,
const ToolChain &TC) const {
std::string error = "<NOT PRESENT>";

if (C.getArgs().hasArg(options::OPT_nostdlib))
return error;

switch (TC.GetCXXStdlibType(C.getArgs())) {
case ToolChain::CST_Libcxx: {
auto evaluate = [&](const char *library) -> std::optional<std::string> {
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8 changes: 8 additions & 0 deletions clang/test/Driver/modules-print-library-module-manifest-path.cpp
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Expand Up @@ -18,6 +18,14 @@
// RUN: --target=x86_64-linux-gnu 2>&1 \
// RUN: | FileCheck libcxx.cpp

// check that -nostdlib causes no library-provided module manifest to
// be reported, even when libc++.modules.json is present.
// RUN: %clang -print-library-module-manifest-path \
// RUN: -nostdlib \
// RUN: -resource-dir=%t/Inputs/usr/lib/x86_64-linux-gnu \
// RUN: --target=x86_64-linux-gnu 2>&1 \
// RUN: | FileCheck libcxx-no-module-json.cpp

// for macos there is a different directory structure
// where the library and libc++.modules.json file are in lib
// directly but headers are in clang/ver directory which
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