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Workaround for gcc issue with FMT_STRING within if constexpr.

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This fixes issue #1455 by making the return type explicit,
and adds a C++17-specific test to demonstrate the bug.
This commit is contained in:
Dair Grant 2020-03-05 12:48:01 +00:00
parent db4a6cfbf9
commit dac909b1dd
2 changed files with 22 additions and 12 deletions
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2
include/fmt/format.h
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@ -3545,7 +3545,7 @@ FMT_CONSTEXPR internal::udl_arg<wchar_t> operator"" _a(const wchar_t* s,
FMT_END_NAMESPACE FMT_END_NAMESPACE
#define FMT_STRING_IMPL(s, ...) \ #define FMT_STRING_IMPL(s, ...) \
[] { \ []() -> fmt::basic_string_view<fmt::remove_cvref_t<decltype(*s)>> { \
/* Use a macro-like name to avoid shadowing warnings. */ \ /* Use a macro-like name to avoid shadowing warnings. */ \
struct FMT_COMPILE_STRING : fmt::compile_string { \ struct FMT_COMPILE_STRING : fmt::compile_string { \
using char_type = fmt::remove_cvref_t<decltype(*s)>; \ using char_type = fmt::remove_cvref_t<decltype(*s)>; \

10
test/format-test.cc
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@ -2570,3 +2570,13 @@ TEST(FormatTest, FormatUTF8Precision) {
EXPECT_EQ(result.size(), 5); EXPECT_EQ(result.size(), 5);
EXPECT_EQ(from_u8str(result), from_u8str(str.substr(0, 5))); EXPECT_EQ(from_u8str(result), from_u8str(str.substr(0, 5)));
} }
TEST(FormatTest, Issue1455) {
#if (__cplusplus >= 201703L)
if constexpr(true) {
EXPECT_EQ("foo", fmt::format(FMT_STRING("{}"), "foo"));
} else {
EXPECT_EQ("foo", fmt::format(FMT_STRING("{}"), "foo"));
}
#endif
}