CMake: Check that backend targets are defined

Create a generator expression that fails to evaluate if a backend does
not exist. This avoids confusing compilation errors.

Change-Id: I5475fa53bf604b6cc445d9774b96fd8d5eb66f09
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/44564
Commit-Queue: Wyatt Hepler <hepler@google.com>
Reviewed-by: Vic Yang <victoryang@google.com>
2 files changed
tree: 147a15b6d2c6eb0e4788849c3b964dcd940c0a64
  1. build_overrides/
  2. docker/
  3. docs/
  4. pw_allocator/
  5. pw_analog/
  6. pw_arduino_build/
  7. pw_assert/
  8. pw_assert_basic/
  9. pw_assert_log/
  10. pw_base64/
  11. pw_bloat/
  12. pw_blob_store/
  13. pw_boot_armv7m/
  14. pw_build/
  15. pw_bytes/
  16. pw_checksum/
  17. pw_chrono/
  18. pw_chrono_embos/
  19. pw_chrono_freertos/
  20. pw_chrono_stl/
  21. pw_chrono_threadx/
  22. pw_cli/
  23. pw_containers/
  24. pw_cpu_exception/
  25. pw_cpu_exception_cortex_m/
  26. pw_docgen/
  27. pw_doctor/
  28. pw_env_setup/
  29. pw_fuzzer/
  30. pw_hdlc/
  31. pw_hex_dump/
  32. pw_i2c/
  33. pw_interrupt/
  34. pw_interrupt_cortex_m/
  35. pw_kvs/
  36. pw_libc/
  37. pw_log/
  38. pw_log_basic/
  39. pw_log_multisink/
  40. pw_log_null/
  41. pw_log_rpc/
  42. pw_log_sink/
  43. pw_log_tokenized/
  44. pw_malloc/
  45. pw_malloc_freelist/
  46. pw_metric/
  47. pw_minimal_cpp_stdlib/
  48. pw_module/
  49. pw_multisink/
  50. pw_package/
  51. pw_persistent_ram/
  52. pw_polyfill/
  53. pw_preprocessor/
  54. pw_presubmit/
  55. pw_protobuf/
  56. pw_protobuf_compiler/
  57. pw_random/
  58. pw_result/
  59. pw_ring_buffer/
  60. pw_router/
  61. pw_rpc/
  62. pw_snapshot/
  63. pw_span/
  64. pw_status/
  65. pw_stream/
  66. pw_string/
  67. pw_sync/
  68. pw_sync_baremetal/
  69. pw_sync_embos/
  70. pw_sync_freertos/
  71. pw_sync_stl/
  72. pw_sync_threadx/
  73. pw_sys_io/
  74. pw_sys_io_arduino/
  75. pw_sys_io_baremetal_lm3s6965evb/
  76. pw_sys_io_baremetal_stm32f429/
  77. pw_sys_io_stdio/
  78. pw_target_runner/
  79. pw_thread/
  80. pw_thread_embos/
  81. pw_thread_freertos/
  82. pw_thread_stl/
  83. pw_thread_threadx/
  84. pw_tokenizer/
  85. pw_tool/
  86. pw_toolchain/
  87. pw_trace/
  88. pw_trace_tokenized/
  89. pw_unit_test/
  90. pw_varint/
  91. pw_watch/
  92. pw_web_ui/
  93. targets/
  94. third_party/
  95. .bazelignore
  96. .bazelrc
  97. .clang-format
  98. .eslintrc.json
  99. .gitattributes
  100. .gitignore
  101. .gn
  102. .prettierrc.js
  103. .pylintrc
  104. activate.bat
  105. AUTHORS
  106. bootstrap.bat
  107. bootstrap.sh
  108. BUILD
  109. BUILD.gn
  110. BUILDCONFIG.gn
  111. CMakeLists.txt
  112. LICENSE
  113. modules.gni
  114. OWNERS
  115. package.json
  116. PW_PLUGINS
  117. README.md
  118. tsconfig.json
  119. WORKSPACE
  120. yarn.lock
README.md

See our website: http://pigweed.dev