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doc: Fix mpgen usage string #80

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Merged
ryanofsky merged 1 commit into from
Sep 19, 2022
Merged

doc: Fix mpgen usage string #80

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15 changes: 14 additions & 1 deletion src/mp/gen.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -110,6 +110,19 @@ bool BoxedType(const ::capnp::Type& type)
type.isFloat64() || type.isEnum());
}

// src_file is path to .capnp file to generate stub code from.
//
// src_prefix can be used to generate outputs in a different directory than the
// source directory. For example if src_file is "/a/b/c/d/file.canp", and
// src_prefix is "/a/b", then output files will be "c/d/file.capnp.h"
// "c/d/file.capnp.cxx" "c/d/file.capnp.proxy.h", etc. This is equivalent to
// the capnp "--src-prefix" option (see "capnp help compile").
//
// include_prefix can be used to control relative include paths used in
// generated files. For example if src_file is "/a/b/c/d/file.canp" and
// include_prefix is "/a/b/c" include lines like
// "#include <d/file.capnp.proxy.h>" "#include <d/file.capnp.proxy-types.h>"i
// will be generated.
void Generate(kj::StringPtr src_prefix,
kj::StringPtr include_prefix,
kj::StringPtr src_file,
Expand Down Expand Up @@ -594,7 +607,7 @@ void Generate(kj::StringPtr src_prefix,
int main(int argc, char** argv)
{
if (argc < 3) {
fprintf(stderr, "Usage: " PROXY_BIN " SRC_PREFIX SRC_FILE [IMPORT_PATH...]\n");
fprintf(stderr, "Usage: " PROXY_BIN " SRC_PREFIX INCLUDE_PREFIX SRC_FILE [IMPORT_PATH...]\n");
exit(1);
}
std::vector<kj::StringPtr> import_paths;
Expand Down