Source: qtbase-opensource-src
Version: 5.10.1+dfsg-5
Severity: important
Justification: fails to build from source (but built in past)
User: debian-al...@lists.debian.org
Usertags: ftbfs
Tags: patch
qtbase-opensource-src FTBFS on Alpha [1] due to an ambiguous
resolution of the overloaded call to atime() with definitions of
atime() at lines 246, 254 and 299 in
src/corelib/io/qfilesystemengine_unix.cpp. The one at line 299
is declared as:
Q_DECL_UNUSED static typename std::enable_if<(&T::st_atimensec, true)
...
which I guess (I don't know C++ very well) means that if the field
st_atimensec is present then include that declaration of atime(). On
Alpha Linux this field is present in the struct stat declaration in
the header file (sys/stat.h) inside a union declaration, which looks
to be a unique definition of struct stat amongst the Linicies. So
this definition of atime() at line 299 applies on Alpha Linux and
conflicts with one of the earlier definitions at lines 246 and 254.
I don't know if this is a bug in the header file (i.e. glibc) or
present for historical reasons (Alpha Linux being the first 64-bit
Linux does have some idiosyncrasies not repeated in later 64-bit
Linicies), nevertheless I attach a patch that disables the second
confounding definition of atime() at line 299 on Alpha only. With
the patch qtbase-opensource-src builds to completion on Alpha.
Cheers
Michael.
[1]
https://buildd.debian.org/status/fetch.php?pkg=qtbase-opensource-src&arch=alpha&ver=5.10.1%2Bdfsg-5&stamp=1523222004&raw=0
--- a/src/corelib/io/qfilesystemengine_unix.cpp
+++ b/src/corelib/io/qfilesystemengine_unix.cpp
@@ -292,7 +292,7 @@
{ return timespecToMSecs(statBuffer.st_mtimespec); }
#endif
-#ifndef st_mtimensec
+#if !defined(st_mtimensec) && !defined(__alpha__)
// Xtimensec
template <typename T>
Q_DECL_UNUSED static typename std::enable_if<(&T::st_atimensec, true), qint64>::type
