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On 01/19/2013 11:28 AM, Lubos Lunak wrote:
On Friday 18 of January 2013, julien2412 wrote:
Hello,

On pc Debian x86-64 with master sources after having runned "make clean",
I've got this:
/home/julien/compile-libreoffice/libo/sal/qa/rtl/strings/test_strings_value
x.cxx: In instantiation of ‘void testInt() [with T = rtl::OUString]’:
/home/julien/compile-libreoffice/libo/sal/qa/rtl/strings/test_strings_value
x.cxx:77:28: required from here
/home/julien/compile-libreoffice/libo/sal/qa/rtl/strings/test_strings_value
x.cxx:48:5: error: passing ‘unsigned char’ chooses ‘int’ over ‘unsigned int’
[-Werror=sign-promo]

  -Wsign-promo is a rather pointless warning these days (the section in the gcc
manpage is a funny read and not only because it talks about Cfront). I've
added more overloads to silence it, but I rather wonder why we have this
explicitly enabled at all.

I removed the explicitly enabled -Wsign-promo with <http://cgit.freedesktop.org/libreoffice/core/commit/?id=488823a140217e393298bc83e75084041a85ed45> "Remove -Wsign-promo," mainly as a quick way to silence the warnings that started to pop up after <http://cgit.freedesktop.org/libreoffice/core/commit/?id=63bcb139b941a2eff1b5ad367046bca067e7d1f8> "Replaced O[U]String::valueOf( static_cast<> ) with O[U]String::number()."

That also allowed to revert <http://cgit.freedesktop.org/libreoffice/core/commit/?id=1efe9a15f86a7a9dc08b57fd1dd12336522ba515> "avoid -Wsign-promo warnings" again with <http://cgit.freedesktop.org/libreoffice/core/commit/?id=2ae6e77881028a287610f13d10f4c37242ff464b> 'Revert "avoid -Wsign-promo warnings.'"

The explicit -Wsign-promo had originally been added with <http://cgit.freedesktop.org/libreoffice/core/commit/?id=e8bbb76827dd7a0e30d7d1db34a812a84d85f390> "ensure correct export size type in stream operation," apparently to detect an SvStream::operator<< call with a bool argument that would pick the "int" overload instead of the "unsigned char" (aka sal_Bool) one (which would have happened to trigger the -Wsign-promo warning "by luck," given that sal_Bool is unsigned char and not signed char, say). I assume that <https://gerrit.libreoffice.org/#/c/1798/> "Detect SvStream::operator<< calls with bool args w/o using -Wsign-promo" would be a better fix for that (at least, a local "make check" kept succeeding with that patch applied here).

Stephan

- but it incidentally triggers when passing bool to SvStream, because it
doesn't have any overload for operator<<(bool), and int is chosen over
unsigned char AKA sal_Bool , so Caolan added it in
e8bbb76827dd7a0e30d7d1db34a812a84d85f390
- if SvStream gets overload for bool, the warning can be dumped

Ach, I failed to read Lubos' mail carefully until I now quote it for my reply, and all the stuff I write above has already been said...

Context


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