[Driver] Mark OpenBSD-specific -nopie as TargetSpecific after #72578

so that we get an `error: unsupported option '-nopie' for target ...` instead of a warning.

Author: MaskRay

clang/include/clang/Driver/Options.td

@@ -5169,7 +5169,7 @@ def nodriverkitlib : Flag<["-"], "nodriverkitlib">;
 def nofixprebinding : Flag<["-"], "nofixprebinding">;
 def nolibc : Flag<["-"], "nolibc">;
 def nomultidefs : Flag<["-"], "nomultidefs">;
-def nopie : Flag<["-"], "nopie">, Visibility<[ClangOption, FlangOption]>;
+def nopie : Flag<["-"], "nopie">, Visibility<[ClangOption, FlangOption]>, Flags<[TargetSpecific]>; // OpenBSD
 def no_pie : Flag<["-"], "no-pie">, Visibility<[ClangOption, FlangOption]>;
 def noprebind : Flag<["-"], "noprebind">;
 def noprofilelib : Flag<["-"], "noprofilelib">;

clang/test/Driver/linux-ld.c

@@ -209,7 +209,7 @@
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "{{.*}}rcrt1.o"
 // CHECK-CLANG-LD-STATIC-PIE-STATIC: "--start-group" "-lgcc" "-lgcc_eh" "-lc" "--end-group"
 //
-// RUN: not %clang -static-pie -nopie -### %s -no-pie 2>&1 \
+// RUN: not %clang -static-pie -### %s -no-pie 2>&1 \
 // RUN:     --target=x86_64-unknown-linux -rtlib=platform \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/basic_linux_tree \
@@ -1861,3 +1861,7 @@
 // CHECK-OE-AARCH64: "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "-lc" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed"
 // CHECK-OE-AARCH64: "[[SYSROOT]]/usr/lib64/aarch64-oe-linux/6.3.0{{/|\\\\}}crtend.o"
 // CHECK-OE-AARCH64: "[[SYSROOT]]/usr/lib64/aarch64-oe-linux/6.3.0/../../../lib64{{/|\\\\}}crtn.o"
+
+/// -nopie is OpenBSD-specific.
+// RUN: not %clang -### --target=x86_64-unknown-linux-gnu %s -nopie 2>&1 | FileCheck %s --check-prefix=CHECK-NOPIE
+// CHECK-NOPIE: error: unsupported option '-nopie' for target 'x86_64-unknown-linux-gnu'

clang/test/Driver/solaris-ld.c

@@ -132,11 +132,11 @@
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-PIE-GLD %s
-// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -nopie -fuse-ld= \
+// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -no-pie -fuse-ld= \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NOPIE-LD %s
-// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -nopie -fuse-ld=gld \
+// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -no-pie -fuse-ld=gld \
 // RUN:     --gcc-toolchain="" \
 // RUN:     --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NOPIE-GLD %s
@@ -191,7 +191,7 @@
 // RUN:        --gcc-toolchain="" \
 // RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-CRTS %s
-// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -nopie \
+// RUN: %clang --target=sparc-sun-solaris2.11 -### %s -no-pie \
 // RUN:        --gcc-toolchain="" \
 // RUN:        --sysroot=%S/Inputs/solaris_sparc_tree 2>&1 \
 // RUN:   | FileCheck --check-prefix=CHECK-NOCRTS %s