1 include(AddCCompilerFlag)
2 include(CheckCCompilerFlagSSP)
6 # Check for -Werror turned on if possible
8 # This will prevent that compiler flags are detected incorrectly.
10 check_c_compiler_flag("-Werror" REQUIRED_FLAGS_WERROR)
11 if (REQUIRED_FLAGS_WERROR)
12 set(CMAKE_REQUIRED_FLAGS "-Werror")
15 list(APPEND SUPPORTED_COMPILER_FLAGS "-Werror")
19 add_c_compiler_flag("-std=gnu99" SUPPORTED_COMPILER_FLAGS)
20 #add_c_compiler_flag("-Wpedantic" SUPPORTED_COMPILER_FLAGS)
21 add_c_compiler_flag("-Wall" SUPPORTED_COMPILER_FLAGS)
22 add_c_compiler_flag("-Wshadow" SUPPORTED_COMPILER_FLAGS)
23 add_c_compiler_flag("-Wmissing-prototypes" SUPPORTED_COMPILER_FLAGS)
24 add_c_compiler_flag("-Wcast-align" SUPPORTED_COMPILER_FLAGS)
25 #add_c_compiler_flag("-Wcast-qual" SUPPORTED_COMPILER_FLAGS)
26 add_c_compiler_flag("-Werror=address" SUPPORTED_COMPILER_FLAGS)
27 add_c_compiler_flag("-Wstrict-prototypes" SUPPORTED_COMPILER_FLAGS)
28 add_c_compiler_flag("-Werror=strict-prototypes" SUPPORTED_COMPILER_FLAGS)
29 add_c_compiler_flag("-Wwrite-strings" SUPPORTED_COMPILER_FLAGS)
30 add_c_compiler_flag("-Werror=write-strings" SUPPORTED_COMPILER_FLAGS)
31 add_c_compiler_flag("-Werror-implicit-function-declaration" SUPPORTED_COMPILER_FLAGS)
32 add_c_compiler_flag("-Wpointer-arith" SUPPORTED_COMPILER_FLAGS)
33 add_c_compiler_flag("-Werror=pointer-arith" SUPPORTED_COMPILER_FLAGS)
34 add_c_compiler_flag("-Wdeclaration-after-statement" SUPPORTED_COMPILER_FLAGS)
35 add_c_compiler_flag("-Werror=declaration-after-statement" SUPPORTED_COMPILER_FLAGS)
36 add_c_compiler_flag("-Wreturn-type" SUPPORTED_COMPILER_FLAGS)
37 add_c_compiler_flag("-Werror=return-type" SUPPORTED_COMPILER_FLAGS)
38 add_c_compiler_flag("-Wuninitialized" SUPPORTED_COMPILER_FLAGS)
39 add_c_compiler_flag("-Werror=uninitialized" SUPPORTED_COMPILER_FLAGS)
40 add_c_compiler_flag("-Wimplicit-fallthrough" SUPPORTED_COMPILER_FLAGS)
41 # FIXME: We can't use this as there is a glibc bug in socket.h
42 # https://bugzilla.redhat.com/show_bug.cgi?id=2047022
43 # https://sourceware.org/bugzilla/show_bug.cgi?id=28846
44 #add_c_compiler_flag("-Werror=strict-overflow" SUPPORTED_COMPILER_FLAGS)
45 #add_c_compiler_flag("-Wstrict-overflow=2" SUPPORTED_COMPILER_FLAGS)
46 add_c_compiler_flag("-Wno-format-zero-length" SUPPORTED_COMPILER_FLAGS)
48 check_c_compiler_flag("-Wformat" REQUIRED_FLAGS_WFORMAT)
49 if (REQUIRED_FLAGS_WFORMAT)
50 list(APPEND SUPPORTED_COMPILER_FLAGS "-Wformat")
51 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Wformat")
53 add_c_compiler_flag("-Wformat-security" SUPPORTED_COMPILER_FLAGS)
54 add_c_compiler_flag("-Werror=format-security" SUPPORTED_COMPILER_FLAGS)
56 # Allow zero for a variadic macro argument
57 string(TOLOWER "${CMAKE_C_COMPILER_ID}" _C_COMPILER_ID)
58 if ("${_C_COMPILER_ID}" STREQUAL "clang")
59 add_c_compiler_flag("-Wno-gnu-zero-variadic-macro-arguments" SUPPORTED_COMPILER_FLAGS)
62 add_c_compiler_flag("-fno-common" SUPPORTED_COMPILER_FLAGS)
65 string(TOLOWER "${CMAKE_BUILD_TYPE}" CMAKE_BUILD_TYPE_LOWER)
66 if (CMAKE_BUILD_TYPE_LOWER MATCHES (release|relwithdebinfo|minsizerel))
67 add_c_compiler_flag("-Wp,-D_FORTIFY_SOURCE=2" SUPPORTED_COMPILER_FLAGS)
72 check_c_compiler_flag_ssp("-fstack-protector-strong" WITH_STACK_PROTECTOR_STRONG)
73 if (WITH_STACK_PROTECTOR_STRONG)
74 list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector-strong")
75 # This is needed as Solaris has a seperate libssp
77 list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector-strong")
79 else (WITH_STACK_PROTECTOR_STRONG)
80 check_c_compiler_flag_ssp("-fstack-protector" WITH_STACK_PROTECTOR)
81 if (WITH_STACK_PROTECTOR)
82 list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-protector")
83 # This is needed as Solaris has a seperate libssp
85 list(APPEND SUPPORTED_LINKER_FLAGS "-fstack-protector")
88 endif (WITH_STACK_PROTECTOR_STRONG)
90 check_c_compiler_flag_ssp("-fstack-clash-protection" WITH_STACK_CLASH_PROTECTION)
91 if (WITH_STACK_CLASH_PROTECTION)
92 list(APPEND SUPPORTED_COMPILER_FLAGS "-fstack-clash-protection")
97 add_c_compiler_flag("-Wno-error=deprecated-declarations" SUPPORTED_COMPILER_FLAGS)
98 add_c_compiler_flag("-Wno-error=tautological-compare" SUPPORTED_COMPILER_FLAGS)
101 # Unset CMAKE_REQUIRED_FLAGS
102 unset(CMAKE_REQUIRED_FLAGS)
106 add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES=1" SUPPORTED_COMPILER_FLAGS)
107 add_c_compiler_flag("/D _CRT_SECURE_CPP_OVERLOAD_STANDARD_NAMES_COUNT=1" SUPPORTED_COMPILER_FLAGS)
108 add_c_compiler_flag("/D _CRT_NONSTDC_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
109 add_c_compiler_flag("/D _CRT_SECURE_NO_WARNINGS=1" SUPPORTED_COMPILER_FLAGS)
112 if (SUPPORTED_COMPILER_FLAGS)
113 set(DEFAULT_C_COMPILE_FLAGS ${SUPPORTED_COMPILER_FLAGS} CACHE INTERNAL "Default C Compiler Flags" FORCE)
115 if (SUPPORTED_LINKER_FLAGS)
116 set(DEFAULT_LINK_FLAGS ${SUPPORTED_LINKER_FLAGS} CACHE INTERNAL "Default C Linker Flags" FORCE)