b50e8c5927
There are times when we wish to explicitly control the C++ standard library search paths used by the driver. For example, when we're building against the Android NDK, we might want to use the NDK's C++ headers (which have a custom inline namespace) even if we have C++ headers installed next to the driver. We might also be building against a non-standard directory layout and wanting to specify the C++ standard library include directories explicitly. We could accomplish this by passing -nostdinc++ and adding an explicit -isystem for our custom search directories. However, users of our toolchain may themselves want to use -nostdinc++ and a custom C++ search path (libc++'s build does this, for example), and our added -isystem won't respect the -nostdinc++, leading to multiple C++ header directories on the search path, which causes build failures. Add a new driver option -stdlib++-isystem to support this use case. Passing this option suppresses adding the default C++ library include paths in the driver, and it also respects -nostdinc++ to allow users to still override the C++ library paths themselves. It's a bit unfortunate that we end up with both -stdlib++-isystem and -cxx-isystem, but their semantics differ significantly. -cxx-isystem is unaffected by -nostdinc++ and is added to the end of the search path (which is not appropriate for C++ standard library headers, since they often #include_next into other system headers), while -stdlib++-isystem respects -nostdinc++, is added to the beginning of the search path, and suppresses the default C++ library include paths. Differential Revision: https://reviews.llvm.org/D64089 llvm-svn: 367982
54 lines
3.0 KiB
C++
54 lines
3.0 KiB
C++
// Backslash escaping makes matching against the installation directory fail on
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// Windows. Temporarily disable the test there until we add an option to print
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// the installation directory unescaped.
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// UNSUPPORTED: system-windows
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// By default, we should search for libc++ next to the driver.
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// RUN: mkdir -p %t/bin
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// RUN: mkdir -p %t/include/c++/v1
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// RUN: %clang -target aarch64-linux-android -ccc-install-dir %t/bin \
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// RUN: -stdlib=libc++ -fsyntax-only %s -### 2>&1 | \
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// RUN: FileCheck -check-prefix=LIBCXX %s
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// RUN: %clang -target x86_64-apple-darwin -ccc-install-dir %t/bin \
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// RUN: -stdlib=libc++ -fsyntax-only %s -### 2>&1 | \
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// RUN: FileCheck -check-prefix=LIBCXX %s
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// LIBCXX: InstalledDir: [[INSTALLDIR:.+$]]
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// LIBCXX: "-internal-isystem" "[[INSTALLDIR]]/../include/c++/v1"
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// Passing -stdlib++-isystem should suppress the default search.
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// RUN: %clang -target aarch64-linux-android -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -stdlib=libc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=NODEFAULT %s
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// RUN: %clang -target x86_64-apple-darwin -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -stdlib=libc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=NODEFAULT %s
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// NODEFAULT: InstalledDir: [[INSTALLDIR:.+$]]
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// NODEFAULT-NOT: "-internal-isystem" "[[INSTALLDIR]]/../include/c++/v1"
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// And we should add it as an -internal-isystem.
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// RUN: %clang -target aarch64-linux-android -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -stdlib=libc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=INCPATH %s
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// RUN: %clang -target x86_64-apple-darwin -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -stdlib=libc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=INCPATH %s
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// INCPATH: "-internal-isystem" "/tmp/foo" "-internal-isystem" "/tmp/bar"
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// We shouldn't pass the -stdlib++-isystem to cc1.
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// RUN: %clang -target aarch64-linux-android -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp -stdlib=libc++ -fsyntax-only %s -### 2>&1 | \
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// RUN: FileCheck -check-prefix=NOCC1 %s
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// RUN: %clang -target x86_64-apple-darwin -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp -stdlib=libc++ -fsyntax-only %s -### 2>&1 | \
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// RUN: FileCheck -check-prefix=NOCC1 %s
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// NOCC1-NOT: "-stdlib++-isystem" "/tmp"
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// It should respect -nostdinc++.
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// RUN: %clang -target aarch64-linux-android -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -nostdinc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=NOSTDINCXX %s
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// RUN: %clang -target x86_64-apple-darwin -ccc-install-dir %t/bin \
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// RUN: -stdlib++-isystem /tmp/foo -stdlib++-isystem /tmp/bar -nostdinc++ \
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// RUN: -fsyntax-only %s -### 2>&1 | FileCheck -check-prefix=NOSTDINCXX %s
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// NOSTDINCXX-NOT: "-internal-isystem" "/tmp/foo" "-internal-isystem" "/tmp/bar"
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