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fix: Declare FlagRegisterer c’tor explicit template instanations as extern in header

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This commit is contained in:
Andreas Schuh 2018-09-30 20:28:22 -07:00
parent 3e2e349307
commit 82456f220f
1 changed files with 17 additions and 0 deletions

17
src/gflags.h.in
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@ -441,6 +441,23 @@ class GFLAGS_DLL_DECL FlagRegisterer {
FlagType* current_storage, FlagType* defvalue_storage);
};
// Force compiler to not generate code for the given template specialization.
#define GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(type) \
extern template GFLAGS_DLL_DECL FlagRegisterer::FlagRegisterer( \
const char* name, const char* help, const char* filename, \
type* current_storage, type* defvalue_storage)
// Do this for all supported flag types.
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(bool);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(int32);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(uint32);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(int64);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(uint64);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(double);
GFLAGS_DECLARE_FLAG_REGISTERER_CTOR(std::string);
#undef GFLAGS_DECLARE_FLAG_REGISTERER_CTOR
// If your application #defines STRIP_FLAG_HELP to a non-zero value
// before #including this file, we remove the help message from the
// binary file. This can reduce the size of the resulting binary