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Optionally attach declarations to the global module rather than module fmt (#3387)

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This allows coexistence with TUs that use {fmt} through #include without duplicating declarations, definitions, linker symbols, and object code.
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Daniela Engert 2023-04-23 15:04:36 +02:00 committed by GitHub
parent 18154cc903
commit eafcd3c8e1
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1 changed files with 16 additions and 2 deletions
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18
src/fmt.cc
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@ -71,6 +71,15 @@ export module fmt;
#define FMT_END_DETAIL_NAMESPACE \
} \
export {
// If you define FMT_ATTACH_TO_GLOBAL_MODULE
// - all declarations are detached from module 'fmt'
// - the module behaves like a traditional static library, too
// - all library symbols are mangled traditionally
// - you can mix TUs with either importing or #including the {fmt} API
#ifdef FMT_ATTACH_TO_GLOBAL_MODULE
extern "C++" {
#endif
// All library-provided declarations and definitions must be in the module
// purview to be exported.
#include "fmt/args.h"
@ -80,12 +89,17 @@ export module fmt;
#include "fmt/format.h"
#include "fmt/os.h"
#include "fmt/printf.h"
#include "fmt/xchar.h"
#include "fmt/std.h"
#include "fmt/xchar.h"
#ifdef FMT_ATTACH_TO_GLOBAL_MODULE
}
#endif
// gcc doesn't yet implement private module fragments
#if !FMT_GCC_VERSION
module : private;
module :private;
#endif
#include "format.cc"