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https://github.com/fmtlib/fmt.git
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80 lines
2.3 KiB
CMake
80 lines
2.3 KiB
CMake
# Test if compile errors are produced where necessary.
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cmake_minimum_required(VERSION 3.1.0)
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include(CheckCXXSourceCompiles)
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include(CheckCXXCompilerFlag)
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set(CMAKE_REQUIRED_INCLUDES ${CMAKE_CURRENT_SOURCE_DIR}/../../include)
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set(CMAKE_REQUIRED_FLAGS ${CXX_STANDARD_FLAG} ${PEDANTIC_COMPILE_FLAGS})
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function (generate_source result fragment)
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set(${result} "
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#define FMT_HEADER_ONLY 1
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#include \"fmt/format.h\"
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int main() {
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${fragment}
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}
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" PARENT_SCOPE)
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endfunction ()
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function (expect_compile code)
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generate_source(source "${code}")
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check_cxx_source_compiles("${source}" compiles)
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if (NOT compiles)
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set(error_msg "Compile error for: ${code}")
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endif ()
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# Unset the CMake cache variable compiles. Otherwise the compile test will
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# just use cached information next time it runs.
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unset(compiles CACHE)
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if (error_msg)
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message(FATAL_ERROR ${error_msg})
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endif ()
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endfunction ()
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function (expect_compile_error code)
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generate_source(source "${code}")
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check_cxx_source_compiles("${source}" compiles)
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if (compiles)
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set(error_msg "No compile error for: ${code}")
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endif ()
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# Unset the CMake cache variable compiles. Otherwise the compile test will
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# just use cached information next time it runs.
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unset(compiles CACHE)
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if (error_msg)
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message(FATAL_ERROR ${error_msg})
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endif ()
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endfunction ()
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# check if the source file skeleton compiles
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expect_compile("")
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# Formatting a wide character with a narrow format string is forbidden.
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expect_compile_error("fmt::format(\"{}\", L'a');")
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# Formatting a wide string with a narrow format string is forbidden.
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expect_compile_error("fmt::format(\"{}\", L\"foo\");")
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# Formatting a narrow string with a wide format string is forbidden because
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# mixing UTF-8 with UTF-16/32 can result in an invalid output.
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expect_compile_error("fmt::format(L\"{}\", \"foo\");")
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# Formatting a wide string with a narrow format string is forbidden.
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expect_compile_error("
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struct S {
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operator std::string() const { return std::string(); }
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};
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fmt::format(\"{}\", S());
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")
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# Make sure that compiler features detected in the header
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# match the features detected in CMake.
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if (SUPPORTS_USER_DEFINED_LITERALS)
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set(supports_udl 1)
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else ()
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set(supports_udl 0)
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endif ()
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expect_compile("#if FMT_USE_USER_DEFINED_LITERALS != ${supports_udl}
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# error
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#endif")
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