[PATCH] RISC-V: Force linker error exit after unresolvable reloc.

Jim Wilson jimw@sifive.com
Fri Aug 30 22:16:00 GMT 2019

This was noticed while trying to test the compiler -msave-restore support.
Putting non-pic code in a shared library gives a linker error, but doesn't
stop the build.

rohan:2030$ cat libtmp.c
extern int sub2 (int);
int sub (int i) { return sub2 (i + 10); }
rohan:2031$ cat libtmp2.c
extern int sub (int);
int sub2 (int i) { return sub (i + 10); }
rohan:2032$ riscv64-unknown-linux-gnu-gcc --shared -o libtmp.so libtmp.c
rohan:2033$ riscv64-unknown-linux-gnu-gcc --shared -o libtmp2.so libtmp2.c libtmp.so
/home/jimw/FOSS/install-riscv64/lib/gcc/riscv64-unknown-linux-gnu/8.3.0/../../../../riscv64-unknown-linux-gnu/bin/ld: /tmp/cctrsIBe.o(.text+0x18): unresolvable R_RISCV_CALL relocation against symbol `sub'
rohan:2034$ echo $?
rohan:2035$ ls -lt libtmp2.so
-rwxr-xr-x 1 jimw jimw 6912 Aug 30 14:32 libtmp2.so

The patch fixes this by forcing a linker error.  I now get this.

ohan:2059$ sh tmp.script
/home/jimw/FOSS/BINUTILS/X-riscv64-linux/ld/ld-new: libtmp2.o(.text+0x18): unresolvable R_RISCV_CALL relocation against symbol `sub'
/home/jimw/FOSS/BINUTILS/X-riscv64-linux/ld/ld-new: final link failed: bad value
rohan:2060$ echo $?
rohan:2061$ ls -lt libtmp2.so
ls: cannot access 'libtmp2.so': No such file or directory

This was tested with 32/64-bit elf/linux cross binutils build and checks.
There were no regressions.  It also works for the original problem.



	* elfnn-riscv.c (riscv_elf_relocate_section): For unresolvable reloc
	error, call bfd_set_error, set ret to FALSE, and goto out label.
 bfd/elfnn-riscv.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bfd/elfnn-riscv.c b/bfd/elfnn-riscv.c
index 4729bae09a..ef2471eb99 100644
--- a/bfd/elfnn-riscv.c
+++ b/bfd/elfnn-riscv.c
@@ -2297,7 +2297,10 @@ riscv_elf_relocate_section (bfd *output_bfd,
 	     (uint64_t) rel->r_offset,
-	  continue;
+	  bfd_set_error (bfd_error_bad_value);
+	  ret = FALSE;
+	  goto out;
       if (r == bfd_reloc_ok)

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