xref: /llvm-project/openmp/cmake/HandleOpenMPOptions.cmake (revision 15279e7569108cccb49ca1fcfdfae420124d3fac) 
1if (NOT COMMAND append_if)
2  # From HandleLLVMOptions.cmake
3  function(append_if condition value)
4    if (${condition})
5      foreach(variable ${ARGN})
6        set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
7      endforeach(variable)
8    endif()
9  endfunction()
10endif()
11
12if (NOT COMMAND append)
13  function(append value)
14    foreach(variable ${ARGN})
15      set(${variable} "${${variable}} ${value}" PARENT_SCOPE)
16    endforeach(variable)
17  endfunction()
18endif()
19
20# MSVC and clang-cl in compatibility mode map -Wall to -Weverything.
21# TODO: LLVM adds /W4 instead, check if that works for the OpenMP runtimes.
22if (NOT MSVC)
23  append_if(OPENMP_HAVE_WALL_FLAG "-Wall" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
24endif()
25if (OPENMP_ENABLE_WERROR)
26  append_if(OPENMP_HAVE_WERROR_FLAG "-Werror" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
27endif()
28
29append_if(OPENMP_HAVE_COLOR_DIAGNOSTICS "-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
30
31# Additional warnings that are not enabled by -Wall.
32append_if(OPENMP_HAVE_WCAST_QUAL_FLAG "-Wcast-qual" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
33append_if(OPENMP_HAVE_WFORMAT_PEDANTIC_FLAG "-Wformat-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
34append_if(OPENMP_HAVE_WIMPLICIT_FALLTHROUGH_FLAG "-Wimplicit-fallthrough" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
35append_if(OPENMP_HAVE_WSIGN_COMPARE_FLAG "-Wsign-compare" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
36
37# Warnings that we want to disable because they are too verbose or fragile.
38
39# GCC silently accepts any -Wno-<foo> option, but warns about those options
40# being unrecognized only if the compilation triggers other warnings to be
41# printed. Therefore, check for whether the compiler supports options in the
42# form -W<foo>, and if supported, add the corresponding -Wno-<foo> option.
43
44append_if(OPENMP_HAVE_WEXTRA_FLAG "-Wno-extra" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
45append_if(OPENMP_HAVE_WPEDANTIC_FLAG "-Wno-pedantic" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
46append_if(OPENMP_HAVE_WMAYBE_UNINITIALIZED_FLAG "-Wno-maybe-uninitialized" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
47
48if (NOT (WIN32 OR CYGWIN))
49  # This flag is not relevant on Windows; the flag is accepted, but produces warnings
50  # about argument unused during compilation.
51  append_if(OPENMP_HAVE_NO_SEMANTIC_INTERPOSITION "-fno-semantic-interposition" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
52endif()
53append_if(OPENMP_HAVE_FUNCTION_SECTIONS "-ffunction-section" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
54append_if(OPENMP_HAVE_DATA_SECTIONS "-fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
55
56if (MSVC)
57  # Disable "warning C4201: nonstandard extension used: nameless struct/union"
58  append("-wd4201" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
59
60  # Disable "warning C4190: '__kmpc_atomic_cmplx8_rd' has C-linkage specified, but returns
61  # UDT '__kmp_cmplx64_t' which is incompatible with C"
62  append("-wd4190" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
63endif()
64