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commit a8ff215e56050a907189e713fd449bcafe99ff6b
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Fri Apr 26 07:16:30 2019 +0200
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Makeconfig: Move -Wl,-rpath-link options before library references
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Previously, the -Wl,-rpath-link options came after the libraries
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injected using LDLIBS-* variables on the link editor command line for
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main programs. As a result, it could happen that installed libraries
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that reference glibc libraries used the installed glibc from the system
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directories, instead of the glibc from the build tree. This can lead to
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link failures if the wrong version of libpthread.so.0 is used, for
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instance, due to differences in the internal GLIBC_PRIVATE interfaces,
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as seen with memusagestat and -lgd after commit
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f9b645b4b0a10c43753296ce3fa40053fa44606a ("memusagestat: use local glibc
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when linking [BZ #18465]").
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The isolation is necessarily imperfect because these installed
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libraries are linked against the installed glibc in the system
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directories. However, in most cases, the built glibc will be newer
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than the installed glibc, and this link is permitted because of the
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ABI backwards compatibility glibc provides.
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diff --git a/Makeconfig b/Makeconfig
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index 1ad25fc5a7251aea..e315fb8a75ca5063 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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@@ -428,8 +428,8 @@ ifndef +link-pie
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$(link-extra-libs)
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+link-pie-after-libc = $(+postctorS) $(+postinit)
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define +link-pie
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-$(CC) $(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-extra-flags) \
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- $(link-libc) $(+link-pie-after-libc)
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+$(CC) $(link-libc-rpath-link) $(+link-pie-before-libc) $(rtld-LDFLAGS) \
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+ $(link-extra-flags) $(link-libc) $(+link-pie-after-libc)
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$(call after-link,$@)
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endef
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define +link-pie-tests
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@@ -490,8 +490,8 @@ else # not build-pie-default
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$(link-extra-libs)
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+link-after-libc = $(+postctor) $(+postinit)
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define +link
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-$(CC) $(+link-before-libc) $(rtld-LDFLAGS) $(link-extra-flags) $(link-libc) \
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- $(+link-after-libc)
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+$(CC) $(link-libc-rpath-link) $(+link-before-libc) $(rtld-LDFLAGS) \
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+ $(link-extra-flags) $(link-libc) $(+link-after-libc)
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$(call after-link,$@)
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endef
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define +link-tests
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@@ -552,6 +552,15 @@ ifeq (yes,$(build-shared))
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link-libc-rpath = -Wl,-rpath=$(rpath-link)
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link-libc-rpath-link = -Wl,-rpath-link=$(rpath-link)
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+# For programs which are not tests, $(link-libc-rpath-link) is added
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+# directly in $(+link), $(+link-pie) above, so that -Wl,-rpath-link
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+# comes before the expansion of LDLIBS-* and affects libraries added
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+# there. For shared objects, -Wl,-rpath-link is added via
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+# $(build-shlib-helper) and $(build-module-helper) in Makerules (also
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+# before the expansion of LDLIBS-* variables).
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+
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+# Tests use -Wl,-rpath instead of -Wl,-rpath-link for
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+# build-hardcoded-path-in-tests.
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ifeq (yes,$(build-hardcoded-path-in-tests))
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link-libc-tests-rpath-link = $(link-libc-rpath)
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else
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@@ -562,7 +571,7 @@ link-libc-before-gnulib = $(common-objpfx)libc.so$(libc.so-version) \
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$(common-objpfx)$(patsubst %,$(libtype.oS),c) \
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$(as-needed) $(elf-objpfx)ld.so \
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$(no-as-needed)
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-link-libc = $(link-libc-rpath-link) $(link-libc-before-gnulib) $(gnulib)
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+link-libc = $(link-libc-before-gnulib) $(gnulib)
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link-libc-tests-after-rpath-link = $(link-libc-before-gnulib) $(gnulib-tests)
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link-libc-tests = $(link-libc-tests-rpath-link) \
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