================
@@ -0,0 +1,77 @@
+// Test that clang preincludes stdc-predef.h for musl Linux targets and
+// glibc Linux sysroots that provide the header.
+
+// Musl-based systems need this additional include.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CPP-FLAG %s
+
+// GNU-based sysroots with stdc-predef.h also need this additional include.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-gnu \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CPP-FLAG %s
+
+// GNU-based sysroots without stdc-predef.h should not inject a host header.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-gnu \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// Freestanding compilations do not need this additional include.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl -ffreestanding \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// The last of -ffreestanding and -fhosted determines whether this additional
+// include is needed.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl \
+// RUN: -ffreestanding -fhosted --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CPP-FLAG %s
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl \
+// RUN: -fhosted -ffreestanding --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// Disabling standard include directories also disables this additional
include.
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl -nostdinc \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+// RUN: %clang %s -### -c --target=x86_64-unknown-linux-musl -nostdlibinc \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// Because this behavior is implemented by adding preprocessor flags in the
+// driver, disabling preprocessing means the include flag should not appear.
+// RUN: %clang -x cpp-output %s -### -c --target=x86_64-unknown-linux-musl \
+// RUN: --sysroot=%S/Inputs/stdc-predef 2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// The automatic preinclude of stdc-predef.h should not occur if
+// the source filename indicates a preprocessed file.
+// RUN: %clang %S/Inputs/stdc-predef/preprocessed.i -### -c \
+// RUN: --target=x86_64-unknown-linux-musl --sysroot=%S/Inputs/stdc-predef
2>&1 \
+// RUN: | FileCheck --implicit-check-not "stdc-predef.h" %s
+
+// This behavior should appear in all files clang accepts that use the C
+// preprocessor, including C, C++ and Objective-C files, as long as the system
+// uses musl or a glibc sysroot that provides the header.
+// RUN: %clang -x objective-c %s -### -c \
+// RUN: --target=x86_64-unknown-linux-musl --sysroot=%S/Inputs/stdc-predef
2>&1 \
+// RUN: | FileCheck --check-prefix=CHECK-CPP-FLAG %s
+
+// If a target system does not have this header, give an error at line 1.
+// RUN: %clang %s -c -Xclang -verify=expected \
+// RUN: --target=x86_64-unknown-linux-musl \
+// RUN: --sysroot=%S/Inputs/basic_linux_tree 2>&1
+// expected-error@1 {{'stdc-predef.h' file not found}}
+
+// Check if the file is really included by macro.
+// RUN: %clang %s -c -Xclang -verify=ok -DCHECK_DUMMY=1 \
----------------
MaskRay wrote:
Should avoid `-verify` tests in clang driver tests.
https://github.com/llvm/llvm-project/pull/202919
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