https://github.com/jhuber6 created https://github.com/llvm/llvm-project/pull/175593
Summary: The LLVM-libc stores its headers in the target-specific include directory. This PR makes the Linux toolchain include this directory when the environment is LLVM. This should allow the following to work correctly when building the LLVM libc ```shell $> clang --target=x86_64-unknown-linux-llvm -static foo.c ``` In the future we might want to consider making a separate toolchain, but considering that the LLVM-libc intentionally shares a lot of compatibility with GCC I thnk it's easier to just to do conditional operations like this. >From ba35f1e769d1e1ca06788ceee69a6cebc1a9bbe9 Mon Sep 17 00:00:00 2001 From: Joseph Huber <[email protected]> Date: Mon, 12 Jan 2026 11:43:19 -0600 Subject: [PATCH] [Clang] Include LLVM libc header directory from Linux Summary: The LLVM-libc stores its headers in the target-specific include directory. This PR makes the Linux toolchain include this directory when the environment is LLVM. This should allow the following to work correctly when building the LLVM libc ```shell $> clang --target=x86_64-unknown-linux-llvm -static foo.c ``` In the future we might want to consider making a separate toolchain, but considering that the LLVM-libc intentionally shares a lot of compatibility with GCC I thnk it's easier to just to do conditional operations like this. --- clang/lib/Driver/ToolChains/Linux.cpp | 7 +++++++ clang/test/Driver/Inputs/basic_llvm_linux_tree/bin/.keep | 0 .../Inputs/basic_llvm_linux_tree/include/c++/v1/.keep | 0 .../include/x86_64-unknown-linux-llvm/.keep | 0 .../include/x86_64-unknown-linux-llvm/c++/v1/.keep | 0 .../lib/x86_64-unknown-linux-llvm/.keep | 0 .../lib/x86_64-unknown-linux-llvm/crt0.o | 0 clang/test/Driver/linux-llvm-toolchain.c | 3 +++ 8 files changed, 10 insertions(+) create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/bin/.keep create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/include/c++/v1/.keep create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/.keep create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/c++/v1/.keep create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/.keep create mode 100644 clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/crt0.o create mode 100644 clang/test/Driver/linux-llvm-toolchain.c diff --git a/clang/lib/Driver/ToolChains/Linux.cpp b/clang/lib/Driver/ToolChains/Linux.cpp index cdbf21fb90263..da4aaa907dafb 100644 --- a/clang/lib/Driver/ToolChains/Linux.cpp +++ b/clang/lib/Driver/ToolChains/Linux.cpp @@ -747,6 +747,13 @@ void Linux::AddClangSystemIncludeArgs(const ArgList &DriverArgs, if (DriverArgs.hasArg(options::OPT_nostdlibinc)) return; + // The LLVM-libc environment stores its C headers in the Clang include + // directory. + if (getTriple().getEnvironment() == llvm::Triple::LLVM) { + if (std::optional<std::string> Path = getStdlibIncludePath()) + addSystemInclude(DriverArgs, CC1Args, *Path); + } + // LOCAL_INCLUDE_DIR addSystemInclude(DriverArgs, CC1Args, concat(SysRoot, "/usr/local/include")); // TOOL_INCLUDE_DIR diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/bin/.keep b/clang/test/Driver/Inputs/basic_llvm_linux_tree/bin/.keep new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/c++/v1/.keep b/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/c++/v1/.keep new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/.keep b/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/.keep new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/c++/v1/.keep b/clang/test/Driver/Inputs/basic_llvm_linux_tree/include/x86_64-unknown-linux-llvm/c++/v1/.keep new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/.keep b/clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/.keep new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/crt0.o b/clang/test/Driver/Inputs/basic_llvm_linux_tree/lib/x86_64-unknown-linux-llvm/crt0.o new file mode 100644 index 0000000000000..e69de29bb2d1d diff --git a/clang/test/Driver/linux-llvm-toolchain.c b/clang/test/Driver/linux-llvm-toolchain.c new file mode 100644 index 0000000000000..46632de779f25 --- /dev/null +++ b/clang/test/Driver/linux-llvm-toolchain.c @@ -0,0 +1,3 @@ +// RUN: %clang -### --target=x86_64-unknown-linux-llvm --sysroot=%S/Inputs/basic_llvm_linux_tree \ +// RUN: -ccc-install-dir %S/Inputs/basic_llvm_linux_tree/bin %s 2>&1 | FileCheck %s --check-prefix=CHECK-HEADERS +// CHECK-HEADERS: "-cc1"{{.*}}"-isysroot"{{.*}}"-internal-isystem" "{{.*}}include/x86_64-unknown-linux-llvm" _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
