# REQUIRES: shell
# UNSUPPORTED: system-windows

# RUN: rm -rf %T/baremetal_multilib
# RUN: mkdir -p %T/baremetal_multilib/bin
# RUN: mkdir -p %T/baremetal_multilib/lib/clang-runtimes/arm-none-eabi/thumb/v8-m.main/fp/lib
# RUN: touch %T/baremetal_multilib/lib/clang-runtimes/arm-none-eabi/thumb/v8-m.main/fp/lib/libclang_rt.builtins.a
# RUN: ln -s %clang %T/baremetal_multilib/bin/clang
# RUN: ln -s %s %T/baremetal_multilib/lib/clang-runtimes/multilib.yaml

# RUN: %T/baremetal_multilib/bin/clang -no-canonical-prefixes -x c++ %s -### -o %t.out 2>&1 \
# RUN:     --target=thumbv8m.main-none-eabihf --sysroot= \
# RUN:   | FileCheck -DSYSROOT=%T/baremetal_multilib %s
# CHECK:      "-cc1" "-triple" "thumbv8m.main-none-unknown-eabihf"
# CHECK-SAME: "-internal-isystem" "[[SYSROOT]]/bin/../lib/clang-runtimes/arm-none-eabi/thumb/v8-m.main/fp/include/c++/v1"
# CHECK-SAME: "-internal-isystem" "[[SYSROOT]]/bin/../lib/clang-runtimes/arm-none-eabi/thumb/v8-m.main/fp/include"
# CHECK-SAME: "-x" "c++" "{{.*}}baremetal-multilib.yaml"
# CHECK-NEXT: ld{{(.exe)?}}" "{{.*}}.o" "-Bstatic"
# CHECK-SAME: "-L[[SYSROOT]]/bin/../lib/clang-runtimes/arm-none-eabi/thumb/v8-m.main/fp/lib"
# CHECK-SAME: "-lc" "-lm" "-lclang_rt.builtins"
# CHECK-SAME: "-o" "{{.*}}.tmp.out"

# RUN: %T/baremetal_multilib/bin/clang -no-canonical-prefixes -x c++ %s -### -o %t.out 2>&1 \
# RUN:     --target=thumbv7em-none-eabi -mfpu=fpv4-sp-d16 --sysroot= \
# RUN:   | FileCheck --check-prefix=CHECK-NO-MATCH %s
# CHECK-NO-MATCH: warning: no multilib found matching flags:
# CHECK-NO-MATCH-SAME: --target=thumbv7em-none-unknown-eabi
# CHECK-NO-MATCH: note: available multilibs are:
# CHECK-NO-MATCH: --target=thumbv6m-none-unknown-eabi -mfpu=none
# CHECK-NO-MATCH: --target=thumbv7m-none-unknown-eabi -mfpu=none
# CHECK-NO-MATCH: --target=thumbv7em-none-unknown-eabi -mfpu=none

# RUN: %T/baremetal_multilib/bin/clang -no-canonical-prefixes -print-multi-directory 2>&1 \
# RUN:     --target=thumbv8m.main-none-eabihf --sysroot= \
# RUN:   | FileCheck --check-prefix=CHECK-PRINT-MULTI-DIRECTORY %s
# CHECK-PRINT-MULTI-DIRECTORY: arm-none-eabi/thumb/v8-m.main/fp

# RUN: %T/baremetal_multilib/bin/clang -no-canonical-prefixes -print-multi-lib 2>&1 \
# RUN:     --target=arm-none-eabi --sysroot= \
# RUN:   | FileCheck --check-prefix=CHECK-PRINT-MULTI-LIB %s
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v6-m/nofp;@-target=thumbv6m-none-unknown-eabi@mfpu=none
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v7-m/nofp;@-target=thumbv7m-none-unknown-eabi@mfpu=none
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v7e-m/nofp;@-target=thumbv7em-none-unknown-eabi@mfpu=none
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v8-m.main/nofp;@-target=thumbv8m.main-none-unknown-eabi@mfpu=none
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v8.1-m.main/nofp/nomve;@-target=thumbv8.1m.main-none-unknown-eabi@mfpu=none
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v7e-m/fpv4_sp_d16;@-target=thumbv7em-none-unknown-eabihf@mfpu=fpv4-sp-d16
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v7e-m/fpv5_d16;@-target=thumbv7em-none-unknown-eabihf@mfpu=fpv5-d16
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v8-m.main/fp;@-target=thumbv8m.main-none-unknown-eabihf@mfpu=fpv5-d16
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v8.1-m.main/fp;@-target=thumbv8.1m.main-none-unknown-eabihf@mfpu=fp-armv8-fullfp16-sp-d16
# CHECK-PRINT-MULTI-LIB: arm-none-eabi/thumb/v8.1-m.main/nofp/mve;@-target=thumbv8.1m.main-none-unknown-eabihf@march=thumbv8.1m.main+mve@mfpu=none

# RUN: %T/baremetal_multilib/bin/clang -no-canonical-prefixes -x assembler -mexecute-only \
# RUN:     --target=arm-none-eabi --sysroot= %s -c -### 2>&1 \
# RUN:    | FileCheck %s --check-prefix=CHECK-NO-EXECUTE-ONLY-ASM
# CHECK-NO-EXECUTE-ONLY-ASM: warning: argument unused during compilation: '-mexecute-only'

---
# This file is in two parts:
# 1. A list of library variants.
# 2. A mapping from flags generated from command line arguments to further
#    flags.

# How does clang use this file?
# 1. If the ToolChain class for the architecture supports this form of
#    multilib it then it loads the file if present in sysroot.
# 2. Generate flags from the user provided arguments.
#    (Use `clang -print-multi-flags-experimental` to see which flags are
#    generated).
# 3. Compare the arguments against each regular expression and store
#    associated flags if there's a match.
# 4. Find the last library variant whose flags are a subset of the
#    flags derived from the user provided arguments.
# 5. Use the directory for the library variant as the sysroot.

# Clang will emit an error if this number is greater than its current multilib
# version or if its major version differs, but will accept lesser minor
# versions.
MultilibVersion: 1.0

# The first section of the file is the list of library variants.
# A library is considered compatible if the are a subset of the flags derived
# from the arguments provided by the user.
# If multiple libraries are deemed compatible then the one that appears
# last in the list wins. A ToolChain may instead opt to use more than one
# multilib, layered on top of each other.

Variants:
- Dir: arm-none-eabi/arm/v4t
  Flags: [--target=armv4t-none-unknown-eabi]

- Dir: arm-none-eabi/thumb/v6-m/nofp
  Flags: [--target=thumbv6m-none-unknown-eabi, -mfpu=none]

- Dir: arm-none-eabi/thumb/v7-m/nofp
  Flags: [--target=thumbv7m-none-unknown-eabi, -mfpu=none]

- Dir: arm-none-eabi/thumb/v7e-m/nofp
  Flags: [--target=thumbv7em-none-unknown-eabi, -mfpu=none]

- Dir: arm-none-eabi/thumb/v8-m.main/nofp
  Flags: [--target=thumbv8m.main-none-unknown-eabi, -mfpu=none]

- Dir: arm-none-eabi/thumb/v8.1-m.main/nofp/nomve
  Flags: [--target=thumbv8.1m.main-none-unknown-eabi, -mfpu=none]

- Dir: arm-none-eabi/thumb/v7e-m/fpv4_sp_d16
  Flags: [--target=thumbv7em-none-unknown-eabihf, -mfpu=fpv4-sp-d16]

- Dir: arm-none-eabi/thumb/v7e-m/fpv5_d16
  Flags: [--target=thumbv7em-none-unknown-eabihf, -mfpu=fpv5-d16]

- Dir: arm-none-eabi/thumb/v8-m.main/fp
  Flags: [--target=thumbv8m.main-none-unknown-eabihf, -mfpu=fpv5-d16]

- Dir: arm-none-eabi/thumb/v8.1-m.main/fp
  Flags: [--target=thumbv8.1m.main-none-unknown-eabihf, -mfpu=fp-armv8-fullfp16-sp-d16]

- Dir: arm-none-eabi/thumb/v8.1-m.main/nofp/mve
  Flags: [--target=thumbv8.1m.main-none-unknown-eabihf, -march=thumbv8.1m.main+mve, -mfpu=none]


# The second section of the file is a map from auto-detected flags
# to custom flags. The auto-detected flags can be printed out
# by running clang with `-print-multi-flags-experimental`.
# The regex must match a whole flag string.
# All flags in the "Flags" list will be added if an argument matches.
Mappings:
# For v8m.base (and potential later v8m baseline versions) use v6m
- Match: --target=thumbv8(\.[0-9]+)?m\.base-none-unknown-eabi
  Flags: [--target=thumbv6m-none-unknown-eabi]
# Match versions after v8.1m.main. We assume that v8.2m (if/when it exists) will
# be backwards compatible with v8.1m.
# The alternative is to not recognise later versions, and require that
# this multilib spec is updated before it can be used with newer
# architecture versions.
- Match: --target=thumbv8\.[1-9]m\.main-none-unknown-eabi
  Flags: [--target=thumbv8.1m.main-none-unknown-eabi]
- Match: --target=thumbv8\.[1-9]m\.main-none-unknown-eabihf
  Flags: [--target=thumbv8.1m.main-none-unknown-eabihf]

- Match: -march=thumbv8\.[1-9]m\.main.*\+mve($|\+).*
  Flags: [-march=thumbv8.1m.main+mve]

# Hierarchy among FPUs: fpvN-d16 is a superset of fpvN-sp-d16, and
# fpvN-d16 is a superset of fpv[N-1]-d16, for all N.
- Match: -mfpu=fpv5-d16
  Flags:
  - -mfpu=fpv4-d16
  - -mfpu=fpv5-sp-d16
  - -mfpu=fpv4-sp-d16
- Match: -mfpu=fpv5-sp-d16
  Flags:
  - -mfpu=fpv4-sp-d16
- Match: -mfpu=fpv4-d16
  Flags:
  - -mfpu=fpv4-sp-d16

...