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Reland r371785: Add -Wpoison-system-directories warning When using clang as a cross-compiler, we should not use system headers to do the compilation. This CL adds support of a new warning flag -Wpoison-system-directories which emits warnings if --sysroot is set and headers from common host system location are used. By default the warning is disabled. The intention of the warning is to catch bad includes which are usually generated by third party build system not targeting cross-compilation. Such cases happen in Chrome OS when someone imports a new package or upgrade one to a newer version from upstream. This is reland of r371785 with a fix to test file. Patch by: denik (Denis Nikitin) llvm-svn: 371878
2019-09-14 02:00:51 +08:00
// REQUIRES: x86-registered-target
// System directory and sysroot option causes warning.
// RUN: %clang -Wpoison-system-directories -target x86_64 -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
// RUN: %clang -Wpoison-system-directories -target x86_64 -cxx-isystem/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
// RUN: %clang -Wpoison-system-directories -target x86_64 -iquote/usr/local/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
// RUN: %clang -Wpoison-system-directories -target x86_64 -isystem/usr/local/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.1.stderr
// RUN: FileCheck -check-prefix=WARN < %t.1.stderr %s
// Missing target but included sysroot still causes the warning.
// RUN: %clang -Wpoison-system-directories -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.2.stderr
// RUN: FileCheck -check-prefix=WARN < %t.2.stderr %s
// With -Werror the warning causes the failure.
// RUN: not %clang -Werror=poison-system-directories -target x86_64 -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s 2> %t.3.stderr
// RUN: FileCheck -check-prefix=ERROR < %t.3.stderr %s
// Cros target without sysroot causes no warning.
// RUN: %clang -Wpoison-system-directories -Werror -target x86_64 -I/usr/include -c -o - %s
// By default the warning is off.
// RUN: %clang -Werror -target x86_64 -I/usr/include --sysroot %S/Inputs/sysroot_x86_64_cross_linux_tree -c -o - %s
// WARN: warning: include location {{[^ ]+}} is unsafe for cross-compilation [-Wpoison-system-directories]
// ERROR: error: include location {{[^ ]+}} is unsafe for cross-compilation [-Werror,-Wpoison-system-directories]