[Bug bootstrap/11169] bootstrap failure after passing configure options

[jeroen.dobbelaere@acunia.com]

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11169



------- Additional Comments From jeroen.dobbelaere@acunia.com  2003-06-12 16:56 -------
> The problem here is more complex.  Unfortunately, arm-linux objects are 
> marked as as soft-float even though they do in fact contain FPA 
> instructions (more precisely they are not marked as hard-float, since 
> not-marked => soft-float).  This becomes a problem  when you try to link 

Hmm. My experience dissagrees :
root:/tmp# gcc -c helloworld.c -o t-hardfpu1.o
root:/tmp# gcc -msoft-float -c helloworld.c -o t-softfpu1.o
root:/tmp# readelf -h t-hardfpu1.o
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            ARM
  ABI Version:                       0
  Type:                              REL (Relocatable file)
  Machine:                           ARM
  Version:                           0x1
  Entry point address:               0x0
  Start of program headers:          0 (bytes into file)
  Start of section headers:          156 (bytes into file)
  Flags:                             0x0
  Size of this header:               52 (bytes)
  Size of program headers:           0 (bytes)
  Number of program headers:         0
  Size of section headers:           40 (bytes)
  Number of section headers:         8
  Section header string table index: 5
root:/tmp# readelf -h t-softfpu1.o
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            ARM
  ABI Version:                       0
  Type:                              REL (Relocatable file)
  Machine:                           ARM
  Version:                           0x1
  Entry point address:               0x0
  Start of program headers:          0 (bytes into file)
  Start of section headers:          156 (bytes into file)
  Flags:                             0x200, GNU EABI, software FP
  Size of this header:               52 (bytes)
  Size of program headers:           0 (bytes)
  Number of program headers:         0
  Size of section headers:           40 (bytes)
  Number of section headers:         8
  Section header string table index: 5


-msoft-float explicitely adds 0x200 to the flags,

hmm. following is strange :

root:/tmp# gcc -mcpu=xscale -c helloworld.c -o t-xscalefpu1.o
root:/tmp# readelf -h t-xscalefpu1.o
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            ARM
  ABI Version:                       0
  Type:                              REL (Relocatable file)
  Machine:                           ARM
  Version:                           0x1
  Entry point address:               0x0
  Start of program headers:          0 (bytes into file)
  Start of section headers:          156 (bytes into file)
  Flags:                             0x400, GNU EABI, <unknown>
  Size of this header:               52 (bytes)
  Size of program headers:           0 (bytes)
  Number of program headers:         0
  Size of section headers:           40 (bytes)
  Number of section headers:         8
  Section header string table index: 5


and :

root:/tmp# gcc -mcpu=xscale -msoft-float -c helloworld.c -o t-xscalesoftfpu1.o
root:/tmp# readelf -h t-xscalesoftfpu1.o
ELF Header:
  Magic:   7f 45 4c 46 01 01 01 61 00 00 00 00 00 00 00 00
  Class:                             ELF32
  Data:                              2's complement, little endian
  Version:                           1 (current)
  OS/ABI:                            ARM
  ABI Version:                       0
  Type:                              REL (Relocatable file)
  Machine:                           ARM
  Version:                           0x1
  Entry point address:               0x0
  Start of program headers:          0 (bytes into file)
  Start of section headers:          156 (bytes into file)
  Flags:                             0x200, GNU EABI, software FP
  Size of this header:               52 (bytes)
  Size of program headers:           0 (bytes)
  Number of program headers:         0
  Size of section headers:           40 (bytes)
  Number of section headers:         8
  Section header string table index: 5


0x400 seems to indicate 'vfp', as this flag is also set when passing
'-Wa,-mfpu=vfp'
(gcc-3.0.4, binutils 2.14.90.0.4)

So, the default (no flag) means 'fpa', 0x200 means software floating point and
0x400 means vfp.