http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54226
Bug #: 54226
Summary: Executables compiled with -pie do not work on
NetBSD/sparc or sparc
Classification: Unclassified
Product: gcc
Version: 4.5.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: mar...@netbsd.org
Due to a missing -fPIC when compiling libgcc crtstuff, the binaries are not
actually position independent.
On NetBSD, a "hello world" compiled with gcc -fpie -pie hello.c links to a
binary like this:
a.out: file format elf64-sparc
Program Header:
PHDR off 0x0000000000000040 vaddr 0x0000000000000040 paddr
0x0000000000000040 align 2**3
filesz 0x0000000000000150 memsz 0x0000000000000150 flags r-x
INTERP off 0x0000000000000190 vaddr 0x0000000000000190 paddr
0x0000000000000190 align 2**0
filesz 0x0000000000000017 memsz 0x0000000000000017 flags r--
LOAD off 0x0000000000000000 vaddr 0x0000000000000000 paddr
0x0000000000000000 align 2**20
filesz 0x0000000000000b34 memsz 0x0000000000000b34 flags r-x
...
but of course the first section is not mapped at 0.
Fix is simple: set TARGET_LIBGCC2_CFLAGS in libgcc/config.host (via a new
additional ${tmake_file}) to -fPIC.
I can provide a simple patch doing that, however, I fail to see why this would
be a NetBSD speciality, i.e. why it works without that flags on other systems -
or maybe it just does not work there as well and we need a broader fix (same
solution, different match in config.host).
