I looked into this and the issue is the following:
There is a Cdrom wrapper:
"""
class Cdrom : public pkgCdrom {
public:
bool FindPackages(std::string const &CD,
std::vector<std::string> &List,
std::vector<std::string> &SList,
std::vector<std::string> &SigList,
std::vector<std::string> &TransList,
std::string &InfoDir) {
std::string const startdir = SafeGetCWD();
EXPECT_FALSE(startdir.empty());
bool const result = pkgCdrom::FindPackages(CD, List, SList, SigList,
TransList, InfoDir, NULL, 0);
...
}
"""
and a unittest that calls it:
"""
TEST(CDROMTest,FindPackages)
{
Cdrom cd;
std::string InfoDir;
EXPECT_TRUE(cd.FindPackages(path, Packages, Sources, Signatur, Translation,
InfoDir));
...
EXPECT_EQ(path + "/.disk/", InfoDir);
}
"""
The actual code for this is apt-pkg/cdrom.cc:
"""
bool pkgCdrom::FindPackages(string CD,
vector<string> &List,
vector<string> &SList,
vector<string> &SigList,
vector<string> &TransList,
string &InfoDir, pkgCdromStatus *log,
unsigned int Depth)
{
...
if (DirectoryExists(".disk") == true)
{
if (InfoDir.empty() == true)
InfoDir = CD + ".disk/";
}
...
"""
So I suspect that the optimizer gets confused that InfoDir is a
reference or it gets confused because InfoDir is not used in
FindPackages anymore and it assumes its dead code.
I tried to create a simplified testcase but failed so far. Whats interessting
is that if I add a std::cerr << "debug" line into cdrom.cc lines (or even a "CD
= CD"):
"""
if (DirectoryExists(".disk") == true)
{
if (InfoDir.empty() == true) {
std::cerr << "debug" << std::endl;
InfoDir = CD + ".disk/";
}
}
"""
it works (which indicates dead-code elimination to me).
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https://bugs.launchpad.net/bugs/1473674
Title:
apt fails a test from the testsuite on ppc64el when built with gcc-5
and -O3
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