Enable additional compiler warnings for CMake build

1. add a CMake module to define additional warning flags to enable
   when compiling dispatch.

2. enable the additional warning flags by default for CMake

3. match autotools behavior of not including the BSD_OVERLAY
   when compiling the dispatch_c99 test case. This avoids
   a warning about __printflike being redefined when compiling
   this test case with the expanded set of warning flags.

Signed-off-by: Daniel A. Steffen <dsteffen@apple.com>

Author: dgrove-oss

CMakeLists.txt

@@ -26,6 +26,9 @@ set(WITH_BLOCKS_RUNTIME "" CACHE PATH "Path to blocks runtime")
 
 include(DispatchAppleOptions)
 
+include(DispatchCompilerWarnings)
+dispatch_common_warnings()
+
 option(ENABLE_DISPATCH_INIT_CONSTRUCTOR "enable libdispatch_init as a constructor" ON)
 set(USE_LIBDISPATCH_INIT_CONSTRUCTOR ${ENABLE_DISPATCH_INIT_CONSTRUCTOR})
 

cmake/modules/DispatchCompilerWarnings.cmake

@@ -0,0 +1,90 @@
+
+if("${CMAKE_C_SIMULATE_ID}" STREQUAL "MSVC")
+  # TODO: someone needs to provide the msvc equivalent warning flags
+  macro(dispatch_common_warnings)
+  endmacro()
+else()
+  macro(dispatch_common_warnings)
+	add_compile_options(-Werror)
+	add_compile_options(-Wall)
+	add_compile_options(-Wextra)
+	add_compile_options(-Wno-unknown-warning-option)
+	add_compile_options(-Wno-trigraphs)
+	add_compile_options(-Wmissing-field-initializers)
+	add_compile_options(-Wmissing-prototypes)
+	add_compile_options(-Wdocumentation)
+	add_compile_options(-Wunreachable-code)
+	add_compile_options(-Wmissing-braces)
+	add_compile_options(-Wparentheses)
+	add_compile_options(-Wswitch)
+	add_compile_options(-Wunused-function)
+	add_compile_options(-Wunused-label)
+	add_compile_options(-Wunused-parameter)
+	add_compile_options(-Wunused-variable)
+	add_compile_options(-Wunused-value)
+	add_compile_options(-Wempty-body)
+	add_compile_options(-Wuninitialized)
+	add_compile_options(-Wunknown-pragmas)
+	add_compile_options(-Wshadow)
+	add_compile_options(-Wno-four-char-constants)
+	add_compile_options(-Wconversion)
+	add_compile_options(-Wconstant-conversion)
+	add_compile_options(-Wint-conversion)
+	add_compile_options(-Wbool-conversion)
+	add_compile_options(-Wenum-conversion)
+	add_compile_options(-Wassign-enum)
+	add_compile_options(-Wsign-compare)
+	add_compile_options(-Wshorten-64-to-32)
+	add_compile_options(-Wpointer-sign)
+	add_compile_options(-Wnewline-eof)
+	add_compile_options(-Wdeprecated-declarations)
+	add_compile_options(-Wsign-conversion)
+	add_compile_options(-Winfinite-recursion)
+	add_compile_options(-Warray-bounds-pointer-arithmetic)
+	add_compile_options(-Watomic-properties)
+	add_compile_options(-Wcomma)
+	add_compile_options(-Wconditional-uninitialized)
+	add_compile_options(-Wcovered-switch-default)
+	add_compile_options(-Wdate-time)
+	add_compile_options(-Wdeprecated)
+	add_compile_options(-Wdouble-promotion)
+	add_compile_options(-Wduplicate-enum)
+	add_compile_options(-Wexpansion-to-defined)
+	add_compile_options(-Wfloat-equal)
+	add_compile_options(-Widiomatic-parentheses)
+	add_compile_options(-Wignored-qualifiers)
+	add_compile_options(-Wimplicit-fallthrough)
+	add_compile_options(-Wnullable-to-nonnull-conversion)
+	add_compile_options(-Wobjc-interface-ivars)
+	add_compile_options(-Wover-aligned)
+	add_compile_options(-Wpacked)
+	add_compile_options(-Wpointer-arith)
+	add_compile_options(-Wselector)
+	add_compile_options(-Wstatic-in-inline)
+	add_compile_options(-Wsuper-class-method-mismatch)
+	add_compile_options(-Wswitch-enum)
+	add_compile_options(-Wtautological-compare)
+	add_compile_options(-Wunguarded-availability)
+	add_compile_options(-Wunused)
+	add_compile_options(-Wno-disabled-macro-expansion)
+	add_compile_options(-Wno-pedantic)
+	add_compile_options(-Wno-bad-function-cast)
+	add_compile_options(-Wno-c++-compat)
+	add_compile_options(-Wno-c++98-compat)
+	add_compile_options(-Wno-c++98-compat-pedantic)
+	add_compile_options(-Wno-cast-align)
+	add_compile_options(-Wno-cast-qual)
+	add_compile_options(-Wno-documentation-unknown-command)
+	add_compile_options(-Wno-format-nonliteral)
+	add_compile_options(-Wno-missing-variable-declarations)
+	add_compile_options(-Wno-old-style-cast)
+	add_compile_options(-Wno-padded)
+	add_compile_options(-Wno-reserved-id-macro)
+	add_compile_options(-Wno-shift-sign-overflow)
+	add_compile_options(-Wno-undef)
+	add_compile_options(-Wno-unreachable-code-aggressive)
+	add_compile_options(-Wno-unused-macros)
+	add_compile_options(-Wno-used-but-marked-unused)
+	add_compile_options(-Wno-vla)
+  endmacro()
+endif()