https://sourceware.org/bugzilla/show_bug.cgi?id=19938
cctsai57 <cctsai57 at gmail dot com> changed:
What |Removed |Added
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CC| |cctsai57 at gmail dot com
--- Comment #26 from cctsai57 <cctsai57 at gmail dot com> ---
Hi,
This fix makes gcc's libstdc++ testsuite many fails for the ARM target.
I try to simplify them by the following flow:
# Two source files. The first is simplified from gcc source:
# libstdc++-v3/src/shared/hashtable-aux.cc:
$ cat -n hashtable-aux.cc
1 extern const unsigned long __prime_list[] =
2 {
3 2ul, 3ul, 5ul, 7ul, 11ul, 13ul, 17ul, 19ul, 23ul, 29ul, 31ul,
4 37ul, 41ul, 43ul, 47ul, 53ul, 59ul, 61ul, 67ul, 71ul, 73ul
5 };
$ cat -n b.cc
1 #include <iostream>
2
3 extern const unsigned long __prime_list[];
4
5 int main()
6 {
7 std::cout << "__prime_list[]\n";
8 for (int i = 0; i < 20; ++i)
9 std::cout << __prime_list[i] << ", ";
10 std::cout << "\n";
11
12 return 0;
13 }
$ arm-linux-gnueabihf-g++ -shared -fpic hashtable-aux.cc -o hashtable-aux.so
$ arm-linux-gnueabihf-g++ b.cc ./hashtable-aux.so
# Run under the QEMU
$ export QEMU_LD_PREFIX=$(arm-linux-gnueabihf-g++ -print-sysroot)
$ qemu-arm ./a.out
__prime_list[]
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
The items in the __prime_list[] are all wrong zero! I guess that the problem
is the lost R_ARM_COPY for __prime_list.
See a.out ELF:
$ arm-linux-gnueabihf-readelf --relocs a.out
Relocation section '.rel.dyn' at offset 0x668 contains 2 entries:
Offset Info Type Sym.Value Sym. Name
00020d0c 00001615 R_ARM_GLOB_DAT 00000000 __gmon_start__
00020d70 00000d14 R_ARM_COPY 00020d70 _ZSt4cout@GLIBCXX_3.4
Befor this fix, the old a.out ELF is:
$ arm-linux-gnueabihf-readelf --relocs a.out
Relocation section '.rel.dyn' at offset 0x668 contains 3 entries:
Offset Info Type Sym.Value Sym. Name
00020d14 00001615 R_ARM_GLOB_DAT 00000000 __gmon_start__
00020d20 00000a14 R_ARM_COPY 00020d20 __prime_list
00020d78 00000d14 R_ARM_COPY 00020d78 _ZSt4cout@GLIBCXX_3.4
The tool's version:
gcc: 6.1.1
binutils: 2.26.51 (master branch)
glibc: 2.23
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