Bug#829329: Error combining hardening flags with Qt5

[Nikos Andrikos <nick.andrik@gmail.com>]

reopen -1
thanks

Hi Lisandro,

The -fPIE flags comes from the automatically generated hardening
options, which override the the -fPIC flag that comes from lyx
Makefile, since it comes later in the argument list.

lyx reports this configuration:
  C++ Compiler flags:       -Wall -Wextra -std=c++11 -fPIC -O2
-Wno-deprecated-declarations
  C++ Compiler user flags: -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2
-fPIE -fstack-protector-strong -Wformat -Werror=format-security -fPIC
The first line are the default lyx options. The second line are the
automatically generated hardening options + "-fPIC" that I use as a
workaround to override -fPIE.
The two lines are merged and given to g++ for compilation.

This means that every package that uses qt5 and enables hardening
flags that include +pie (true by default for =all) will encounter this
issue and the maintainers will need to append -fPIC as a workaround.

If -fPIC is needed by design for qt5, then the issue (even as a
wishlist) is in dpkg-buildflags.
What do you think?

Nick

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