kevacoin

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Author	SHA1	Message	Date
Cory Fields	0246ab6088	depends: boost: hard-code hidden symbol visibility tl;dr: This solves boost visibility problems for default/release build configs on non-Linux platforms. When Bitcoin builds against boost's header-only classes, it ends up with objects containing symbols that the upstream boost libs also have. Since Bitcoin builds by default with hidden symbol visibility, it can end up trying to link against a copy of the same symbols with default visibility. This is not a problem on Linux because 3rd party static libs are un-exported by default (--exclude-libs,ALL), but that is not available for MinGW and OSX. Those platforms (and maybe others?) end up confused about which version to use. The OSX linker spews hundreds of: "ld: warning: direct access in <foo> to global weak symbol guard variable for <bar> means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings." MinGW's linker complains similarly. Since the default symbol visibility for Bitcoin is hidden and releases are built that way as well, build Boost with hidden visibility. Linux builds Boost this way also, but only for the sake of continuity. This means that the linker confusion logic is reversed, so the problem will will now be encountered if Bitcoin is built with --disable-reduce-exports, but that's better than the current situation.	10 years ago
Cory Fields	3b63df5fac	depends: boost: build for debug or release as requested Also hook up cppflags there, which was missing before.	10 years ago
Cory Fields	1dec09b341	depends: add shared dependency builder See the README's in depends for documentation	11 years ago

Author

SHA1

Message

Date

Cory Fields

0246ab6088

depends: boost: hard-code hidden symbol visibility

tl;dr: This solves boost visibility problems for default/release build configs
on non-Linux platforms.

When Bitcoin builds against boost's header-only classes, it ends up with
objects containing symbols that the upstream boost libs also have. Since
Bitcoin builds by default with hidden symbol visibility, it can end up trying
to link against a copy of the same symbols with default visibility.
This is not a problem on Linux because 3rd party static libs are un-exported
by default (--exclude-libs,ALL), but that is not available for MinGW and OSX.

Those platforms (and maybe others?) end up confused about which version to use.

The OSX linker spews hundreds of: "ld: warning: direct access in <foo> to
global weak symbol guard variable for <bar> means the weak symbol cannot be
overridden at runtime. This was likely caused by different translation units
being compiled with different visibility settings."

MinGW's linker complains similarly.

Since the default symbol visibility for Bitcoin is hidden and releases are
built that way as well, build Boost with hidden visibility. Linux builds Boost
this way also, but only for the sake of continuity.

This means that the linker confusion logic is reversed, so the problem will
will now be encountered if Bitcoin is built with --disable-reduce-exports, but
that's better than the current situation.

10 years ago

Cory Fields

3b63df5fac

depends: boost: build for debug or release as requested

Also hook up cppflags there, which was missing before.

10 years ago

Cory Fields

1dec09b341

depends: add shared dependency builder

See the README's in depends for documentation

11 years ago

3 Commits (4cdaa95a209808276992dc1eb0ed0773f7927073)