Testing build of grub 1.97 beta on Cygwin 1.7, I found that the grub
.mod files are much larger than on 1.5. The modules are build by 'ld -r'
(and later converted to ELF).
The root of the problem is that the binutils-2.19.51-1 ld behavior
differs from previous 1.5 binutils. The new ld increases the size of
each segment by the size of the previous segment. Bug?
Testcase:
$ cat segm.c
void text() { __asm__(".space 104"); }
char data[256] = "DATA";
const char rdata[16] = "RDATA";
$ gcc -c segm.c
cygwin-1.5:
$ cygcheck -f /bin/ld
binutils-20080624-2
$ ld -r -o segm-r5.o segm.o
cygwin-1.7:
$ cygcheck -f /bin/ld
binutils-2.19.51-1
$ ld -r -o segm-r7.o segm.o
$ size segm.o segm-*.o
text data bss dec hex filename
128 256 0 384 180 segm.o
128 256 0 384 180 segm-r5.o
512 384 400 1296 510 segm-r7.o
$ objdump -s segm-r*.o
segm-r5.o: file format pe-i386
Contents of section .text:
0000 5589e500 00000000 00000000 00000000 U...............
...
0060 00000000 00000000 0000005d c3909090 ...........]....
Contents of section .data:
0080 44415441 00000000 00000000 00000000 DATA............
...
0170 00000000 00000000 00000000 00000000 ................
Contents of section .rdata:
0180 52444154 41000000 00000000 00000000 RDATA...........
segm-r7.o: file format pe-i386
Contents of section .text:
0000 5589e500 00000000 00000000 00000000 U...............
...
0060 00000000 00000000 0000005d c3909090 ...........]....
Contents of section .data:
0000 00000000 00000000 00000000 00000000 ................
...
0080 44415441 00000000 00000000 00000000 DATA............
...
0170 00000000 00000000 00000000 00000000 ................
Contents of section .rdata:
0000 00000000 00000000 00000000 00000000 ................
...
0180 52444154 41000000 00000000 00000000 RDATA...........
There are no related changes in the builtin linker scripts (ld --verbose
-r).
Christian
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