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38cd110ce5
Currently, when there is both an expandlibs descriptor and an actual static library, expandlibs picks the static library. This has the side effect that if there are object files in the static library that aren't directly used, they're dropped when linking, even when they export symbols that would be exported in the final linked binary. In most cases in the code base, files are not dropped that way. The most notable counter-example is xpcomglue, where actually not dropping files leads to link failure because of missing symbols those files reference (yes, that would tend to say the glue is broken in some way). On the opposite side, there is mozglue, which does have both a descriptor and a static library (the latter being necessary for the SDK), and that linking as a static library drops files that shouldn't be dropped (like jemalloc). We're currently relying on -Wl,--whole-archive for those files not to be dropped, but that won't really be possible without much hassle in a world where mozglue dependencies live in moz.build land. Switching expandlibs to use descriptors when they exist, even when there is a static library (so, the opposite of the current behavior) allows to drop -Wl,--whole-archive and prepare for a better future. However, as mentioned, xpcomglue does still require to be linked through the static library, so we need to make it a static library only. To achieve that, we make NO_EXPAND_LIBS now actually mean no expandlibs and use that to build the various different xpcomglues.
9 lines
307 B
Makefile
9 lines
307 B
Makefile
# vim:set ts=8 sw=8 sts=8 noet:
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, You can obtain one at http://mozilla.org/MPL/2.0/.
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DIST_INSTALL = 1
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# Force to build a static library only
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NO_EXPAND_LIBS = 1
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