build: cleanup CMake (#319)

* build: inline a variable

* build: use `LINKER_LANGUAGE` property for C++ runtime

Rather than explicitly name the C++ runtime, use the `LINKER_LANGUAGE`
property to use the driver to spell the C++ runtime appropriately.

* build: use CMake to control C standard

Rather than use compiler specific flags to control the language
standard, indicate to CMake the desired standard.

* build: use the correct variable

These flags are being applied to the *C* compiler, check the C compiler,
not the C++ compiler.

* build: loosen the compiler check

This loosens the compiler identifier check to enable matching AppleClang
which is the identifier for the Xcode compiler.

* build: hoist shared flags to top-level CMakeLists

This hoists the common shared flags handling to the top-level CMakeLists
from sub-layers.  This prevents the duplication of the handling.

* build: remove duplicated flags

This is unnecessary, `/TP` is forced on all MSVC builds, no need to
duplicate the flag for older versions.

* build: loosen C compiler identifier check

Loosen the check to a match rather than equality check, this allows it
to match AppleClang which is the identifier for the Apple vended clang
compiler part of Xcode.

* build: use `add_compile_options`

Use `add_compile_options` rather than modify `CMAKE_C_FLAGS`.  The
latter is meant to be only modified by the user, not the package
developer.

* build: hoist sanitizer flags to global state

This moves the CMAKE_C_FLAGS handling to the top-level and uses
`add_compile_options` rather than modifying the user controlled flags.

* build: hoist `-fvisibilty` flags to top-level

These are global settings, hoist them to the top level.

* build: hoist the debug flag handling

Use a generator expression and hoist the flag handling for the debug
build.

* build: hoist the profile flag handling

This is a global flag, hoist it to the top level and use
`add_compile_options` rather than modify the user controlled flags.

* build: remove incorrect variable handling

This seemed to be attempting to set the linker not the linker flags for
the profile configuration.  This variable is not used, do not set it.

* build: remove unused CMake includes

1 files changed, 35 insertions, 0 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d9488dd..0d90eb1 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,16 @@ option(CMARK_STATIC "Build static libcmark library" ON)
 option(CMARK_SHARED "Build shared libcmark library" ON)
 option(CMARK_LIB_FUZZER "Build libFuzzer fuzzing harness" OFF)
 
+if(NOT MSVC)
+  set(CMAKE_C_STANDARD 99)
+  set(CMAKE_C_STANDARD_REQUIRED YES)
+  set(CMAKE_C_EXTENSIONS NO)
+endif()
+
+# -fvisibility=hidden
+set(CMAKE_C_VISIBILITY_PRESET hidden)
+set(CMAKE_VISIBILITY_INLINES_HIDDEN 1)
+
 # The Linux modules distributed with CMake add "-rdynamic" to the build flags
 # which is incompatible with static linking under certain configurations.
 # Unsetting CMAKE_SHARED_LIBRARY_LINK_C_FLAGS ensures this does not happen.
@@ -19,6 +29,31 @@ if(CMARK_STATIC AND "${CMAKE_SYSTEM_NAME}" STREQUAL "Linux")
   SET(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS)
 endif()
 
+# Compiler flags
+if(MSVC)
+  # Force to always compile with W4
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:/W4>)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:/wd4706>)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:/TP>)
+  add_compile_definitions($<$<COMPILE_LANGUAGE:C>:/D_CRT_SECURE_NO_WARNINGS>)
+elseif(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID MATCHES Clang)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:-Wall>)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:-Wextra>)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:-pedantic>)
+endif()
+
+# Check integrity of node structure when compiled as debug
+add_compile_definitions($<$<CONFIG:Debug>:CMARK_DEBUG_NODES>)
+
+add_compile_options($<$<AND:$<CONFIG:PROFILE>,$<COMPILE_LANGUAGE:C>>:-pg>)
+
+if(CMAKE_BUILD_TYPE STREQUAL Ubsan)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:-fsanitize=undefined>)
+endif()
+if(CMARK_LIB_FUZZER)
+  add_compile_options($<$<COMPILE_LANGUAGE:C>:-fsanitize-coverage=trace-pc-guard>)
+endif()
+
 add_subdirectory(src)
 if(CMARK_TESTS AND (CMARK_SHARED OR CMARK_STATIC))
   add_subdirectory(api_test)