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Include <filesystem> only if FMT_CPP_LIB_FILESYSTEM is set (#4258)

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This change results out of necessity since the Nintendo Switch console
SDK does not support `std::filesystem`. The SDK still provides the
`<filesystem>` header, but with an `#error` directive, effectively
breaking any build that includes `<filesystem>`

Because `<filesystem>` is present, `FMT_HAS_INCLUDE` is insufficient
here. With this change and `FMT_CPP_LIB_FILESYSTEM` in place, one can
define `FMT_CPP_LIB_FILESYSTEM=0` to work around this issue.

This assumes that `<filesystem>` can be included (without warnings) if
`FMT_CPP_LIB_FILESYSTEM` is set. If this is not the case, fmt would be
broken even before this change as `std::filesystem::path` is used
without the accompanying header.
This commit is contained in:
Alex Hirsch 2024-12-07 15:45:54 +01:00 committed by GitHub
parent 47a66c5ecc
commit 9600fee020
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1 changed files with 1 additions and 3 deletions
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4
include/fmt/std.h
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@ -27,9 +27,6 @@
// Check FMT_CPLUSPLUS to suppress a bogus warning in MSVC. // Check FMT_CPLUSPLUS to suppress a bogus warning in MSVC.
# if FMT_CPLUSPLUS >= 201703L # if FMT_CPLUSPLUS >= 201703L
# if FMT_HAS_INCLUDE(<filesystem>)
# include <filesystem>
# endif
# if FMT_HAS_INCLUDE(<variant>) # if FMT_HAS_INCLUDE(<variant>)
# include <variant> # include <variant>
# endif # endif
@ -79,6 +76,7 @@
#endif #endif
#if FMT_CPP_LIB_FILESYSTEM #if FMT_CPP_LIB_FILESYSTEM
# include <filesystem>
FMT_BEGIN_NAMESPACE FMT_BEGIN_NAMESPACE
namespace detail { namespace detail {