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Avoid a space in the UDL definition (#3610)

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* Avoid a space in the UDL definition except on GCC before 4.9

Clang 18 has grown a warning about the space being deprecated which
is enabled by default in their nightly binaries. However GCC before 4.9
will reject the UDL definition unless there is a space there, so we need
to keep the space conditionally for it.

* Remove UDLs on GCC before 4.9 to simplify things

GCC before 4.9 rejects the syntax that is now
rejected on more modern compilers.

* Disable compile-error-test on GCC < 4.9

This avoids the UDL tests failing as GCC < 4.9 can not parse UDLs
without a space, but the space is malformed in modern compilers.
This commit is contained in:
Dana Jansens 2023-09-18 11:09:42 -04:00 committed by GitHub
parent a8a73da7e4
commit f6ca4ea199
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 11 additions and 3 deletions
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7
include/fmt/format.h
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@ -153,7 +153,10 @@ FMT_END_NAMESPACE
#ifndef FMT_USE_USER_DEFINED_LITERALS
// EDG based compilers (Intel, NVIDIA, Elbrus, etc), GCC and MSVC support UDLs.
# if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 407 || \
//
// GCC before 4.9 requires a space in `operator"" _a` which is invalid in later
// compiler versions.
# if (FMT_HAS_FEATURE(cxx_user_literals) || FMT_GCC_VERSION >= 409 || \
FMT_MSC_VERSION >= 1900) && \
(!defined(__EDG_VERSION__) || __EDG_VERSION__ >= /* UDL feature */ 480)
# define FMT_USE_USER_DEFINED_LITERALS 1
@ -4459,7 +4462,7 @@ template <detail_exported::fixed_string Str> constexpr auto operator""_a() {
return detail::udl_arg<char_t, sizeof(Str.data) / sizeof(char_t), Str>();
}
# else
constexpr auto operator"" _a(const char* s, size_t) -> detail::udl_arg<char> {
constexpr auto operator""_a(const char* s, size_t) -> detail::udl_arg<char> {
return {s};
}
# endif

7
test/CMakeLists.txt
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@ -175,7 +175,12 @@ if (FMT_PEDANTIC)
endif ()
# These tests are disabled on Windows because they take too long.
if (FMT_PEDANTIC AND NOT WIN32)
# They are disabled on GCC < 4.9 because it can not parse UDLs without
# a space after `operator""` but that is an incorrect syntax for any more
# modern compiler.
if (FMT_PEDANTIC AND NOT WIN32 AND NOT (
CMAKE_CXX_COMPILER_ID MATCHES "GNU" AND
CMAKE_CXX_COMPILER_VERSION VERSION_LESS 4.9))
# Test if incorrect API usages produce compilation error.
add_test(compile-error-test ${CMAKE_CTEST_COMMAND}
--build-and-test