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Reapply "[NFC][clang][Driver] Add tests for --driver-mode=flang" (#211724)

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This reapplies #207658.

Some targets do not support flang_rt or clang_rt.
It seems difficult to create a blocklist, so the tests are now
configured to explicitly specify the known-working targets.
The specified targets are extracted from tests in flang/test/Driver.

-----
The original commit message:
This patch intends to clarify the current behaviors, not to state the
expected/desirable behaviors.
This commit is contained in:
Yusuke MINATO 2026-07-31 09:56:12 +09:00 committed by GitHub
parent 0879c1092c
commit 0142992aea
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22
clang/test/Driver/flang/multiple-inputs-mixed.f90
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@ -5,3 +5,25 @@
! CHECK-SYNTAX-ONLY: "{{[^"]*}}/Inputs/one.f90"
! CHECK-SYNTAX-ONLY-LABEL: "{{[^"]*}}clang{{[^"/]*}}" "-cc1"
! CHECK-SYNTAX-ONLY: "{{[^"]*}}/Inputs/other.c"
! Check that flang-only options are not passed to clang.
! RUN: %clang --driver-mode=flang -### -fstack-arrays %S/Inputs/one.f90 %S/Inputs/other.c 2>&1 | FileCheck --check-prefixes=CHECK-FLANG-OPT %s
! CHECK-FLANG-OPT-LABEL: "{{[^"]*}}flang{{[^"/]*}}" "-fc1"
! CHECK-FLANG-OPT: "-fstack-arrays"
! CHECK-FLANG-OPT-LABEL: "{{[^"]*}}clang{{[^"/]*}}" "-cc1"
! CHECK-FLANG-OPT-NOT: "-fstack-arrays"
! The -std= option is accepted by both clang and flang, but its acceptable values differ between the two.
! Currently, -std=c17 is passed to flang, which rejects it. This should be fixed in the future.
! A potential solution is to use -Xflang and -Xclang to pass the option to the right frontend; however, -Xclang is rejected.
! RUN: %clang --driver-mode=flang -### -std=f2018 %S/Inputs/one.f90 -std=c17 %S/Inputs/other.c 2>&1 | FileCheck --check-prefixes=MIXED-OPT %s
! MIXED-OPT-LABEL: "{{[^"]*}}flang{{[^"/]*}}" "-fc1"
! MIXED-OPT: "-std=f2018"
! MIXED-OPT: "-std=c17"
! MIXED-OPT-LABEL: "{{[^"]*}}clang{{[^"/]*}}" "-cc1"
! MIXED-OPT-NOT: "-std=f2018"
! MIXED-OPT: "-std=c17"
! RUN: not %clang --driver-mode=flang -### -Xflang -std=f2018 %S/Inputs/one.f90 -Xclang -std=c17 %S/Inputs/other.c 2>&1 | FileCheck --check-prefixes=SEPARATE-MIXED-OPT %s
! SEPARATE-MIXED-OPT: error: unknown argument '-Xclang'

13
clang/test/Driver/flang/runtimes.f90 Normal file
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@ -0,0 +1,13 @@
! Check that Flang runtimes are passed to the linker in --driver-mode=flang.
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=x86_64-linux-gnu -### %s 2>&1 | FileCheck %s
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=x86_64-pc-windows-msvc -### %s 2>&1 | FileCheck %s
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=aarch64-linux-none -### %s 2>&1 | FileCheck %s
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=ppc64le-linux-gnu -### %s 2>&1 | FileCheck %s
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=powerpc64-ibm-aix -### %s 2>&1 | FileCheck %s
! RUN: %clang --driver-mode=flang --rtlib=compiler-rt --target=sparc-sun-solaris2.11 -### %s 2>&1 | FileCheck %s
! CHECK-DAG: clang_rt.{{[^ "]}}
! CHECK-DAG: flang_rt.{{[^ "]}}
! RUN: not %clang --driver-mode=flang -stdlib=libc++ -### %s 2>&1 | FileCheck --check-prefix=LIBCXX %s
! LIBCXX: error: unknown argument: '-stdlib=libc++'