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toolchain/51030: -pie -static does not work (test failure with MKPIE=yes builds)
>Synopsis: -pie -static does not work (test failure with MKPIE=yes builds)
>Arrival-Date: Wed Mar 30 19:00:00 +0000 2016
>Originator: Martin Husemann
>Release: NetBSD 7.99.26
The NetBSD Foundation, Inc.
System: NetBSD thirdstage.duskware.de 7.99.26 NetBSD 7.99.26 (MODULAR) #466: Tue Mar 29 13:18:26 CEST 2016 martin%thirdstage.duskware.de@localhost:/usr/src/sys/arch/sparc64/compile/MODULAR sparc64
In a build with MKPIE=yes set, the /usr/tests/lib/csu/ tests cause a
new failure (at least on sparc64). This is due to the
/usr/tests/lib/csu/h_initfini2 test being explicitly linked with
-static (this is what is tested) and MKPIE additionaly forcing -pie
It is unclear what kind of binary the combination of "-pie -static"
On sparc64 currently a dynamic object with reference to the non-existent
dynamic linker /usr/lib/sparcv9/ld.so.1 is created and this binary is
Adding -Wl,-dynamic-linker=/usr/libexec/ld.elf_so fixes the issue, but
then this is not a static binary any more.
Compile hello word with:
cc -v -Wall -O2 -fPIE -pie -static hello.c
(assuming you have build your whole world with MKPIE=yes, otherwise it
will fail early) and try to run it. Verify file type with file(1)
and/or readelf -l.
Define proper semantics for "-pie -static" and fix whatever needs fixing
to get there. Jörg suggested a DYN object with interpreter pointing to
itself (how exactly?). Other options would be an empty path as interpreter.
None of these fit my definition of "static".
A completely different aproach would be an EXEC binary with load address NULL,
Elf file type is EXEC (Executable file)
Entry point 0x0
There are 2 program headers, starting at offset 64
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000100000 0x0000000000000000 0x0000000000000000
0x0000000000136dd8 0x000000000013b810 RWE 100000
NOTE 0x00000000002000b0 0x00000000001000b0 0x00000000001000b0
0x0000000000000048 0x0000000000000048 R 4
and assorted kernel fixes to treat this as PIE. This, at least, really is
a "static" binary.
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