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Fix erroneous (and circular) implied pattern rule for linkobj/libc.so.

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[BZ #15915] As described in the bug, the pattern rule for lib%.so files
in Makerules includes linkobj/libc.so as a dependency.  However, the
explicit rule for linkobj/libc.so is in the top-level Makefile.

Thus, the subdirectory makefiles that include Makerules end up with an
erroneous makefile pattern rule for linkobj/libc.so that includes
itself as a dependency.  The result is make warnings whenever rules
for other .so files are resolved -- and, on occasion, actual makefile
failures when a race condition causes the implicit rule to actually be
used.

This patch moves the explicit rules for linkobj/libc.so into Makerules
to clear up this problem.  It also elaborates a couple of comments
that I'd initially found confusing.
This commit is contained in:
Brooks Moses 2013-10-03 10:38:14 -07:00
parent b7f2d27dbd
commit 5f855e3598
3 changed files with 42 additions and 34 deletions
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6
ChangeLog
View File

@ -1,3 +1,9 @@
2013-10-03 Brooks Moses <bmoses@google.com>
[BZ #15915]
* Makefile (linkobj/libc_pic.a, linkobj/libc.so): Move rules to...
* Makerules: ...here, and adjust associated comments.
2013-10-02 Will Newton <will.newton@linaro.org>
* malloc/Makefile: Add tst-pvalloc.

31
Makefile
View File

@ -123,36 +123,7 @@ lib-noranlib: subdir_lib
ifeq (yes,$(build-shared))
# Build the shared object from the PIC object library.
lib: $(common-objpfx)libc.so
lib: $(common-objpfx)linkobj/libc.so
# Do not filter ld.so out of libc.so link.
$(common-objpfx)linkobj/libc.so: link-libc-deps = # empty
$(common-objpfx)linkobj/libc.so: $(elfobjdir)/soinit.os \
$(common-objpfx)linkobj/libc_pic.a \
$(elfobjdir)/sofini.os \
$(elfobjdir)/interp.os \
$(elfobjdir)/ld.so \
$(shlib-lds)
$(build-shlib)
ifeq (,$(filter sunrpc,$(subdirs)))
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a
$(make-target-directory)
ln -f $< $@
else
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a \
$(common-objpfx)sunrpc/librpc_compat_pic.a
$(make-target-directory)
(cd $(common-objpfx)linkobj; \
$(AR) x ../libc_pic.a; \
rm $$($(AR) t ../sunrpc/librpc_compat_pic.a | sed 's/^compat-//'); \
$(AR) x ../sunrpc/librpc_compat_pic.a; \
$(AR) cr libc_pic.a *.os; \
rm *.os)
endif # $(subdirs) contains sunrpc
lib: $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so
endif # $(build-shared)

39
Makerules
View File

@ -565,16 +565,47 @@ generated += libc_pic.opts libc_pic.os.clean
libc_pic_clean := .clean
endif
# Do not filter ld.so out of libc.so link.
$(common-objpfx)libc.so: link-libc-deps = # empty
# Build a possibly-modified version of libc_pic.a for use in building
# linkobj/libc.so.
ifeq (,$(filter sunrpc,$(subdirs)))
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a
$(make-target-directory)
ln -f $< $@
else
$(common-objpfx)linkobj/libc_pic.a: $(common-objpfx)libc_pic.a \
$(common-objpfx)sunrpc/librpc_compat_pic.a
$(make-target-directory)
(cd $(common-objpfx)linkobj; \
$(AR) x ../libc_pic.a; \
rm $$($(AR) t ../sunrpc/librpc_compat_pic.a | sed 's/^compat-//'); \
$(AR) x ../sunrpc/librpc_compat_pic.a; \
$(AR) cr libc_pic.a *.os; \
rm *.os)
endif # $(subdirs) contains sunrpc
# Use our own special initializer and finalizer files for libc.so.
# Clear link-libc-deps for the libc.so libraries so build-shlibs does not
# filter ld.so out of the list of linked objects.
$(common-objpfx)libc.so: link-libc-deps = # empty
$(common-objpfx)linkobj/libc.so: link-libc-deps = # empty
# Use our own special initializer and finalizer files for the libc.so
# libraries.
$(common-objpfx)libc.so: $(elfobjdir)/soinit.os \
$(common-objpfx)libc_pic.os$(libc_pic_clean) \
$(elfobjdir)/sofini.os \
$(elfobjdir)/interp.os $(elfobjdir)/ld.so \
$(elfobjdir)/interp.os \
$(elfobjdir)/ld.so \
$(shlib-lds)
$(build-shlib)
$(common-objpfx)linkobj/libc.so: $(elfobjdir)/soinit.os \
$(common-objpfx)linkobj/libc_pic.a \
$(elfobjdir)/sofini.os \
$(elfobjdir)/interp.os \
$(elfobjdir)/ld.so \
$(shlib-lds)
$(build-shlib)
ifeq ($(build-shared),yes)
$(common-objpfx)libc.so: $(common-objpfx)libc.map
endif