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# Compiler feature checks
#
# Copyright © 2015 Open Microscopy Environment / University of Dundee
# Copyright © 2021 Roger Leigh <rleigh@codelibre.net>
# Written by Roger Leigh <rleigh@codelibre.net>
#
# Permission to use, copy, modify, distribute, and sell this software and
# its documentation for any purpose is hereby granted without fee, provided
# that (i) the above copyright notices and this permission notice appear in
# all copies of the software and related documentation, and (ii) the names of
# Sam Leffler and Silicon Graphics may not be used in any advertising or
# publicity relating to the software without the specific, prior written
# permission of Sam Leffler and Silicon Graphics.
#
# THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
# EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
# WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
#
# IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
# ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
# OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
# LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
# OF THIS SOFTWARE.
include(CheckCCompilerFlag)
# These are annoyingly verbose, produce false positives or don't work
# nicely with all supported compiler versions, so are disabled unless
# explicitly enabled.
option(extra-warnings "Enable extra compiler warnings" OFF)
# This will cause the compiler to fail when an error occurs.
option(fatal-warnings "Compiler warnings are errors" OFF)
# Check if the compiler supports each of the following additional
# flags, and enable them if supported. This greatly improves the
# quality of the build by checking for a number of common problems,
# some of which are quite serious.
if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR
CMAKE_C_COMPILER_ID MATCHES "Clang")
set(test_flags
-Wall
-Winline
-Wformat-security
-Wpointer-arith
-Wdisabled-optimization
-Wno-unknown-pragmas
-fstrict-aliasing)
if(extra-warnings)
list(APPEND test_flags
-pedantic
-Wextra
-Wformat
-Wformat-overflow
-Wformat-nonliteral
-Wformat-signedness
-Wformat-truncation
-Wdeclaration-after-statement
-Wconversion
-Wsign-conversion
-Wnull-dereference
-Wdouble-promotion
-Wmisleading-indentation
-Wmissing-include-dirs
-Wswitch-default
-Wswitch-enum
-Wunused-local-typedefs
-Wunused-parameter
-Wuninitialized
-Warith-conversion
-Wbool-operation
-Wduplicated-branches
-Wduplicated-cond
-Wshadow
-Wunused-macros
-Wc99-c11-compat
-Wcast-qual
-Wcast-align
-Wwrite-strings
-Wdangling-else
-Wsizeof-array-div
-Wsizeof-pointer-div
-Wsizeof-pointer-memaccess
-Wlogical-op
-Wlogical-not-parentheses
-Wstrict-prototypes
-Wmissing-declarations
-Wredundant-decls
-Wno-int-to-pointer-cast
-Wfloat-equal
-Wfloat-conversion
-Wmissing-prototypes
-Wunreachable-code)
endif()
if(fatal-warnings)
list(APPEND test_flags
-Werror)
endif()
elseif(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
set(test_flags)
if(extra-warnings)
list(APPEND test_flags
/W4)
else()
list(APPEND test_flags
/W3)
endif()
if (fatal-warnings)
list(APPEND test_flags
/WX)
endif()
endif()
foreach(flag ${test_flags})
string(REGEX REPLACE "[^A-Za-z0-9]" "_" flag_var "${flag}")
set(test_c_flag "C_FLAG${flag_var}")
CHECK_C_COMPILER_FLAG(${flag} "${test_c_flag}")
if (${test_c_flag})
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${flag}")
endif (${test_c_flag})
endforeach(flag ${test_flags})
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