[unified build] gflags improvement to allow CAFFE2_EXPORTS #10444
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Summary: Explanation copied from code: // Motivation about the gflags wrapper: // (1) We would need to make sure that the gflags version and the non-gflags // version of Caffe2 are going to expose the same flags abstraction. One should // explicitly use caffe2::FLAGS_flag_name to access the flags. // (2) For flag names, it is recommended to start with caffe2_ to distinguish it // from regular gflags flags. For example, do // CAFFE2_DEFINE_BOOL(caffe2_my_flag, true, "An example"); // to allow one to use caffe2::FLAGS_caffe2_my_flag. // (3) Gflags has a design issue that does not properly expose the global flags, // if one builds the library with -fvisibility=hidden. The current gflags (as of // Aug 2018) only deals with the Windows case using dllexport, and not the Linux // counterparts. As a result, we will explciitly use CAFFE2_EXPORT to export the // flags defined in Caffe2. This is done via a global reference, so the flag // itself is not duplicated - under the hood it is the same global gflags flag. Pull Request resolved: pytorch#10444 Differential Revision: D9296726 Pulled By: Yangqing fbshipit-source-id: a867d67260255cc46bf0a928122ff71a575d3966
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Explanation copied from code:
// Motivation about the gflags wrapper:
// (1) We would need to make sure that the gflags version and the non-gflags
// version of Caffe2 are going to expose the same flags abstraction. One should
// explicitly use caffe2::FLAGS_flag_name to access the flags.
// (2) For flag names, it is recommended to start with caffe2_ to distinguish it
// from regular gflags flags. For example, do
// CAFFE2_DEFINE_BOOL(caffe2_my_flag, true, "An example");
// to allow one to use caffe2::FLAGS_caffe2_my_flag.
// (3) Gflags has a design issue that does not properly expose the global flags,
// if one builds the library with -fvisibility=hidden. The current gflags (as of
// Aug 2018) only deals with the Windows case using dllexport, and not the Linux
// counterparts. As a result, we will explciitly use CAFFE2_EXPORT to export the
// flags defined in Caffe2. This is done via a global reference, so the flag
// itself is not duplicated - under the hood it is the same global gflags flag.