Add LIT test coverage for -static-libflangrt on platforms that default to shared.

Author: DanielCChen

flang/test/Driver/linker-flags.f90

@@ -3,21 +3,32 @@
 ! libraries that the Clang driver will include.
 
 ! RUN: %flang -### --target=ppc64le-linux-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX,UNIX-F128%f128-lib
-! RUN: %flang -### --target=aarch64-apple-darwin %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,DARWIN,DARWIN-F128%f128-lib
 ! RUN: %flang -### --target=sparc-sun-solaris2.11 %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX,SOLARIS-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-unknown-freebsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,BSD,BSD-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-unknown-netbsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,BSD,BSD-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-unknown-openbsd %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,BSD,BSD-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-unknown-dragonfly %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,BSD,BSD-F128%f128-lib
+! RUN: %flang -### --target=aarch64-apple-darwin %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,DARWIN,DARWIN-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-unknown-haiku %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,HAIKU,HAIKU-F128%f128-lib
 ! RUN: %flang -### --target=x86_64-windows-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,MINGW,MINGW-F128%f128-lib
+
 ! RUN: %flang -### -rtlib=compiler-rt --target=aarch64-linux-gnu %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,UNIX,COMPILER-RT
 
 ! NOTE: Clang's driver library, clangDriver, usually adds 'oldnames' on Windows,
 !       but it is not needed when compiling Fortran code and they might bring in
 !       additional dependencies. Make sure its not added.
 ! RUN: %flang -### --target=aarch64-windows-msvc -fuse-ld= %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,MSVC --implicit-check-not oldnames
 
+! RUN: %flang -### --target=ppc64le-linux-gnu -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=UNIX-STATIC-FLANGRT
+! RUN: %flang -### --target=sparc-sun-solaris2.11 -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=UNIX-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-unknown-freebsd -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=BSD-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-unknown-netbsd -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=BSD-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-unknown-openbsd -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=BSD-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-unknown-dragonfly -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=CHECK,BSD-STATIC-FLANGRT
+! RUN: %flang -### --target=aarch64-apple-darwin -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=DARWIN-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-unknown-haiku -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=HAIKU-STATIC-FLANGRT
+! RUN: %flang -### --target=x86_64-windows-gnu -static-libflangrt %S/Inputs/hello.f90 2>&1 | FileCheck %s --check-prefixes=MINGW-STATIC-FLANGRT
+
 ! Compiler invocation to generate the object file
 ! CHECK-LABEL: {{.*}} "-emit-obj"
 ! CHECK-SAME:  "-o" "[[object_file:.*\.o]]" {{.*}}Inputs/hello.f90
@@ -36,31 +47,36 @@
 ! UNIX-SAME:   "{{.*}}{{\\|/}}libflang_rt.runtime.so"
 ! UNIX-SAME:   "-lm"
 ! COMPILER-RT: "{{.*}}{{\\|/}}libclang_rt.builtins.a"
+! UNIX-STATIC-FLANGRT:   "{{.*}}{{\\|/}}libflang_rt.runtime.a"
 
 ! BSD-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! BSD-SAME: "[[object_file]]"
 ! BSD-F128NONE-NOT: flang_rt.quadmath
 ! BSD-F128LIBQUADMATH-SAME: "-lflang_rt.quadmath" "--as-needed" "-lquadmath" "--no-as-needed"
 ! BSD-SAME: "{{.*}}{{\\|/}}libflang_rt.runtime.so"
 ! BSD-SAME: "-lexecinfo"
+! BSD-STATIC-FLANGRT: "{{.*}}{{\\|/}}libflang_rt.runtime.a"
 
 ! DARWIN-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! DARWIN-SAME: "[[object_file]]"
 ! DARWIN-F128NONE-NOT: libflang_rt.quadmath
 ! DARWIN-F128LIBQUADMATH-SAME: "-lflang_rt.quadmath" "--as-needed" "-lquadmath" "--no-as-needed"
 ! DARWIN-SAME: "{{.*}}{{\\|/}}libclang_rt.runtime_osx_dynamic.dylib"
+! DARWIN-STATIC-FLANGRT: "{{.*}}{{\\|/}}libclang_rt.runtime_osx.a"
 
 ! HAIKU-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! HAIKU-SAME: "[[object_file]]"
 ! HAIKU-F128NONE-NOT: libflang_rt.quadmath
 ! HAIKU-F128LIBQUADMATH-SAME: "-lflang_rt.quadmath" "--as-needed" "-lquadmath" "--no-as-needed"
 ! HAIKU-SAME: "{{.*}}{{\\|/}}libflang_rt.runtime.so"
+! HAIKU-STATIC-FLANGRT: "{{.*}}{{\\|/}}libflang_rt.runtime.a"
 
 ! MINGW-LABEL:  "{{.*}}ld{{(\.exe)?}}"
 ! MINGW-SAME: "[[object_file]]"
 ! MINGW-F128NONE-NOT: libflang_rt.quadmath
 ! MINGW-F128LIBQUADMATH-SAME: "-lflang_rt.quadmath" "--as-needed" "-lquadmath" "--no-as-needed"
 ! MINGW-SAME: "{{.*}}{{\\|/}}libflang_rt.runtime.dll.a"
+! MINGW-STATIC-FLANGRT: "{{.*}}{{\\|/}}libflang_rt.runtime.a"
 
 ! NOTE: This also matches lld-link (when CLANG_DEFAULT_LINKER=lld) and
 !       any .exe suffix that is added when resolving to the full path of