[Bug target/79975] SEGV in cc1 compiling gcc.dg/rtl/x86_64/final.c with -fno-dwarf2-cfi-asm

[ro at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79975

Rainer Orth <ro at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i?86-pc-solaris2.*,         |i?86-*-*, x86_64-*-*
                   |amd64-pc-solaris2.*,        |
                   |x86_64-unknown-freebsd12.0, |
                   |i386-apple-darwin11.4.2,    |
                   |i386-apple-darwin16.7.0     |
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-01-31
               Host|i?86-pc-solaris2.*,         |
                   |amd64-pc-solaris2.*         |
            Summary|SEGV in cc1 compiling       |SEGV in cc1 compiling
                   |gcc.dg/rtl/x86_64/final.c   |gcc.dg/rtl/x86_64/final.c
                   |                            |with -fno-dwarf2-cfi-asm
     Ever confirmed|0                           |1
              Build|i?86-pc-solaris2.*,         |
                   |amd64-pc-solaris2.*         |

--- Comment #4 from Rainer Orth <ro at gcc dot gnu.org> ---
After fixing the detection of HAVE_GAS_CFI_DIRECTIVE on x86_64-pc-solaris2.*
with gas, I noticed that this failure disappeared on that target.  So obviously
only targets with HAVE_GAS_CFI_DIRECTIVE 0 are affected.

And indeed, the SEGV can easily be reproduced on x86_64-pc-linux-gnu with
-fno-dwarf2-cfi-asm.

Since the testcase is compile-only anyway (thus not depending on toolchain
support
for cfi directives) and scans for those in the assembler output, I'll soon
submit
a patch to add an explicit -fdwarf2-cfi-asm which avoids the SEGV on all x86
targets.