I specify some strings in a section in an object file, and everything looks
good.
---
$ cat one.c
#define STRING(symbol) \
asm(".pushsection " ".asection" ",\"aSM\", @progbits, 1\n" \
"\t.string \"" #symbol "\" \n" \
"\t.popsection\n");
STRING(abc);
STRING(abcdef);
STRING(def);
$ gcc -c one.c
$ objdump --full-contents -j ".asection" ./one.o
./one.o: file format elf64-x86-64
Contents of section .asection:
0000 61626300 61626364 65660064 656600 abc.abcdef.def.
---
Then I link this together, and the final "def" disappears ...
---
wiena...@coopers:/tmp/test$ cat main.c
int main(void) { return 0; }
wiena...@coopers:/tmp/test$ gcc -o main main.c one.c
wiena...@coopers:/tmp/test$ objdump --full-contents -j ".asection" ./main
./main: file format elf64-x86-64
Contents of section .asection:
40057c 61626300 61626364 656600 abc.abcdef.
---
I'm quite unsure why the final def is merged out? The documentation suggests
the merging will be done at the level of a null terminated string [1]; if this
is not so maybe it could be made more clear?
[1] http://sourceware.org/binutils/docs-2.19/as/Section.html
--
Summary: ld merging smaller strings into larger strings?
Product: binutils
Version: 2.19
Status: NEW
Severity: normal
Priority: P2
Component: ld
AssignedTo: unassigned at sources dot redhat dot com
ReportedBy: ianw at vmware dot com
CC: bug-binutils at gnu dot org
http://sourceware.org/bugzilla/show_bug.cgi?id=10302
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