third_party/pigweed/repo/pw_build/CMakeLists.txt

   1 # Copyright 2020 The Pigweed Authors
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License"); you may not
   4 # use this file except in compliance with the License. You may obtain a copy of
   5 # the License at
   6 #
   7 #     https://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  11 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  12 # License for the specific language governing permissions and limitations under
  13 # the License.
  14
  15 # IMPORTANT: The compilation flags in this file must be kept in sync with
  16 #            the GN flags //pw_build/BUILD.gn.
  17
  18 # Target that specifies the standard Pigweed build options.
  19 add_library(pw_build INTERFACE)
  20 target_compile_options(pw_build INTERFACE "-g")
  21 target_link_libraries(pw_build
  22   INTERFACE
  23     pw_build.reduced_size
  24     pw_build.cpp17
  25 )
  26 target_compile_options(pw_build
  27   INTERFACE
  28     # Force the compiler use colorized output. This is required for Ninja.
  29     $<$<CXX_COMPILER_ID:Clang>:-fcolor-diagnostics>
  30     $<$<CXX_COMPILER_ID:GNU>:-fdiagnostics-color=always>
  31 )
  32
  33 # Declare top-level targets for tests.
  34 add_custom_target(pw_tests.default)
  35 add_custom_target(pw_run_tests.default)
  36
  37 add_custom_target(pw_tests DEPENDS pw_tests.default)
  38 add_custom_target(pw_run_tests DEPENDS pw_run_tests.default)
  39
  40 # Define the standard Pigweed compile options.
  41 add_library(pw_build.reduced_size INTERFACE)
  42 target_compile_options(pw_build.reduced_size
  43   INTERFACE
  44     "-fno-common"
  45     "-fno-exceptions"
  46     "-ffunction-sections"
  47     "-fdata-sections"
  48     $<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>
  49 )
  50
  51 add_library(pw_build.strict_warnings INTERFACE)
  52 target_compile_options(pw_build.strict_warnings
  53   INTERFACE
  54     "-Wall"
  55     "-Wextra"
  56     "-Wimplicit-fallthrough"
  57     "-Wcast-qual"
  58     "-Wundef"
  59     "-Wpointer-arith"
  60
  61     # Make all warnings errors, except for the exemptions below.
  62     "-Werror"
  63     "-Wno-error=cpp"  # preprocessor #warning statement
  64     "-Wno-error=deprecated-declarations"  # [[deprecated]] attribute
  65
  66     $<$<COMPILE_LANGUAGE:CXX>:-Wnon-virtual-dtor>
  67 )
  68
  69 add_library(pw_build.extra_strict_warnings INTERFACE)
  70 target_compile_options(pw_build.extra_strict_warnings
  71   INTERFACE
  72     "-Wshadow"
  73     "-Wredundant-decls"
  74 )
  75
  76 add_library(pw_build.cpp17 INTERFACE)
  77 target_compile_options(pw_build.cpp17
  78   INTERFACE
  79     $<$<COMPILE_LANGUAGE:CXX>:-std=c++17>
  80     # Allow uses of the register keyword, which may appear in C headers.
  81     $<$<COMPILE_LANGUAGE:CXX>:-Wno-register>
  82 )
  83
  84 # Create an empty source file and library for general use.
  85 file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/empty_file.c" "")
  86 add_library(pw_build.empty OBJECT "${CMAKE_CURRENT_BINARY_DIR}/empty_file.c" "")