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Prelink static libraries into an object file

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This combines the *.o into a big .o producing one translation unit.
This preserve our unused static initializers, as specified in the C++
standard:

  If no variable or function is odr-used from a given translation
  unit, the non-local variables defined in that translation unit may
  never be initialized (this models the behavior of an on-demand
  dynamic library).

Note that this is very similar to how the --whole-archive flag works.
One advantage of this is that users of the final .a library don’t have
to worry about specifying --whole-archive, or that we have unused
static initializers at all!
This commit is contained in:
Matthew Bauer 2020-06-09 23:35:38 -05:00
parent b2c8061b44
commit 7eca8a16ea
1 changed files with 2 additions and 1 deletions
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3
mk/libraries.mk
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@ -125,7 +125,8 @@ define build-library
$(1)_PATH := $$(_d)/$$($(1)_NAME).a $(1)_PATH := $$(_d)/$$($(1)_NAME).a
$$($(1)_PATH): $$($(1)_OBJS) | $$(_d)/ $$($(1)_PATH): $$($(1)_OBJS) | $$(_d)/
$(trace-ar) $(AR) crs $$@ $$? $(trace-ld) $(LD) -Ur -o $$(_d)/$$($(1)_NAME).o $$?
$(trace-ar) $(AR) crs $$@ $$(_d)/$$($(1)_NAME).o
$(1)_LDFLAGS_USE += $$($(1)_PATH) $$($(1)_LDFLAGS) $(1)_LDFLAGS_USE += $$($(1)_PATH) $$($(1)_LDFLAGS)