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authorBrooks Moses <bmoses@google.com>2013-10-03 10:38:14 -0700
committerBrooks Moses <bmoses@google.com>2013-10-03 10:38:14 -0700
commit5f855e3598a576c35e54623a13b256f3e87fcd4d (patch)
treeba77026f236ca40b764798e0d70001a3fcff58cd /Makerules
parentb7f2d27dbd85f6a0966dc389ad4f8205085b7ae8 (diff)
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Fix erroneous (and circular) implied pattern rule for linkobj/libc.so.
[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.
Diffstat (limited to 'Makerules')
-rw-r--r--Makerules37
1 files changed, 34 insertions, 3 deletions
diff --git a/Makerules b/Makerules
index cca3f82..92c2872 100644
--- a/Makerules
+++ b/Makerules
@@ -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.
+# 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
+
+# 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 libc.so.
+# 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