[Bug binutils/19160] New: Warnings from x86_64-build_apple-darwin15.0.0-gcc when compiling elf32-arm.c and subsequent problems

[rog at rcjd dot net]

https://sourceware.org/bugzilla/show_bug.cgi?id=19160

            Bug ID: 19160
           Summary: Warnings from x86_64-build_apple-darwin15.0.0-gcc when
                    compiling elf32-arm.c and subsequent problems
           Product: binutils
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: rog at rcjd dot net
  Target Milestone: ---

I'm trying to build a Mac to Raspberry Pi cross compilation. I'm using HomeBrew
with crosstool-ng (1.21.0). It's pretty much as described in various places
such as http://www.unsigned.fr/blog/?p=6 but with some additional patching to
deal with sunrpc.

Current state is that the build process breaks due to a missing object file
(libc-start.o). The file is missing due to assembler errors when compiling the
source file:

 /var/folders/zq/rt1zgfw529zd6zk07hw1_bqm0000gs/T//ccIsmKRb.s: Assembler
messages:
[ALL  ]    /var/folders/zq/rt1zgfw529zd6zk07hw1_bqm0000gs/T//ccIsmKRb.s:102:
Error: invalid constant (ff) after fixup
[ALL  ]    /var/folders/zq/rt1zgfw529zd6zk07hw1_bqm0000gs/T//ccIsmKRb.s:184:
Error: invalid constant (af) after fixup

In searching for a possible cause of this, I checked a full log of the build
and discovered warnings coming from the compilation of elf32-arm.c:

 /Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8812:10:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8812:10:
note: use function 'labs' instead
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^~~
[ALL  ]                    labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8847:10:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8847:10:
note: use function 'labs' instead
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^~~
[ALL  ]                    labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8884:10:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:8884:10:
note: use function 'labs' instead
[ALL  ]            value = abs (relocation);
[ALL  ]                    ^~~
[ALL  ]                    labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10119:36:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            g_n = calculate_group_reloc_mask (abs (signed_value), group,
[ALL  ]                                              ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10119:36:
note: use function 'labs' instead
[ALL  ]            g_n = calculate_group_reloc_mask (abs (signed_value), group,
[ALL  ]                                              ^~~
[ALL  ]                                              labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10133:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10133:30:
note: use function 'labs' instead
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10213:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10213:30:
note: use function 'labs' instead
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10221:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10221:30:
note: use function 'labs' instead
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10297:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10297:30:
note: use function 'labs' instead
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10305:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10305:30:
note: use function 'labs' instead
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10381:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10381:30:
note: use function 'labs' instead
[ALL  ]            calculate_group_reloc_mask (abs (signed_value), group - 1,
&residual);
[ALL  ]                                        ^~~
[ALL  ]                                        labs
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10391:30:
warning: absolute value function 'abs' given an argument of type
'bfd_signed_vma' (aka 'long') but has parameter of type 'int' which may cause
truncation of value [-Wabsolute-value]
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^
[ALL  ]   
/Volumes/xtools-build-env/.build/src/binutils-2.25/bfd/elf32-arm.c:10391:30:
note: use function 'labs' instead
[ALL  ]                  (long) rel->r_offset, abs (signed_value),
howto->name);
[ALL  ]                                        ^~~
[ALL  ]                                        labs

On eyeballing the source code for elf32-arm it looks odd - I'm not saying it is
wrong because I'm unable to check - but it looks odd and with warnings being
generated I'm concerned and a little out of my depth.

-- 
You are receiving this mail because:
You are on the CC list for the bug.