diff options
Diffstat (limited to 'sysdeps/mach/hurd/Makefile')
| -rw-r--r-- | sysdeps/mach/hurd/Makefile | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/sysdeps/mach/hurd/Makefile b/sysdeps/mach/hurd/Makefile index d635e9bb0a..92048d92d2 100644 --- a/sysdeps/mach/hurd/Makefile +++ b/sysdeps/mach/hurd/Makefile @@ -111,12 +111,34 @@ $(inst_libdir)/libc.a: $(hurd)/libc-ldscript $(+force); $(do-install) $(inst_libdir)/libc_p.a: $(hurd)/libc_p-ldscript $(+force); $(do-install) endif -# Make sure these are used to build the libc.so shared object too. +# Make sure these are used to build the libc.so shared object too. There +# is a circular dependency between each of these shared objects and libc +# (many high-level libc functions call stubs, stubs call low-level libc +# functions like memcpy and mach_msg). This works out fine at run time +# (all the objects are loaded before resolving their symbols, so these +# interdependencies are fine). But to create the shared objects we must +# link them one at a time; since each needs one or both of the others to +# produce its DT_NEEDED entries and to assign its undefined symbols the +# right symbol versions, we can't do any of them before the others! To +# get around this, we link each lib*user.so shared object twice. First, +# we link an object without reference to libc.so (since we haven't linked +# libc.so yet), so it lacks a DT_NEEDED record for the libc soname it +# depends on, and its undefined symbol references lack the symbol version +# assignments they should have. We will use this shared object solely to +# link libc.so against it; that gives libc.so the proper DT_NEEDED record, +# and symbol versions assignments (if the lib*user.so object is using them). +# Finally we link a second version of the same lib*user.so shared object, +# this time linked normally against libc so it gets a proper DT_NEEDED +# record and symbol version set; this one can be installed for run-time use. rpcuserlibs := $(common-objpfx)mach/libmachuser.so \ $(common-objpfx)hurd/libhurduser.so -$(common-objpfx)libc.so: $(rpcuserlibs) +link-rpcuserlibs := $(rpcuserlibs:%user.so=%user-link.so) +$(common-objpfx)libc.so: $(link-rpcuserlibs) rpath-dirs += mach hurd +$(link-rpcuserlibs): %-link.so: %_pic.a + $(build-module) -nostdlib -Wl,-soname=$(*F).so$($(*F).so-version) + # And get them into the libc.so ldscript. $(inst_libdir)/libc.so: $(rpcuserlibs) |