Building Qt 5.7 on Linux: snprintf_l and sscanf_l not declared

tostiheld

I'm trying to build Qt 5.7 with debug symbols on my local machine. Steps I have followed up to now:

install Qt using the unified setup
also select sources of Qt 5.7 when given the option
cd to the sources directory
run ./configure -debug -opensource -platform linux-g++ -opengl desktop -nomake examples -nomake tests
run make -j 6

Building starts, but after a few seconds it stops with the following message:

In file included from tools/qlocale_tools.cpp:42:0:
tools/qdoublescanprint_p.h: In function ‘int qDoubleSscanf(const char*, locale_t, const char*, double*, int*)’:
tools/qdoublescanprint_p.h:141:54: error: ‘sscanf_l’ was not declared in this scope
     return sscanf_l(buf, locale, format, d, processed);
                                                      ^
tools/qdoublescanprint_p.h: In function ‘int qDoubleSnprintf(char*, size_t, locale_t, const char*, double)’:
tools/qdoublescanprint_p.h:145:53: error: ‘snprintf_l’ was not declared in this scope
     return snprintf_l(buf, buflen, locale, format, d);

I don't know how to solve this, since I believe that function is part of stdlib, which is of course installed on my machine.

hskoglund

Hmm googling snprintf_l looks like it's available on Windows and on the Mac, but not on Linux :-( Maybe it's a bug...

Anon

I'm having the same issue, i'm not able to build despite following this guide and update all dependencies https://wiki.qt.io/Building_Qt_5_from_Git

kshegunov

I build Qt from sources regularly and haven't had a care in the world (following the same wiki you posted). Are you sure you have all the dependencies? For example libc-dev?

Hana A.Aziz

Did you manage to fix this problem?
I face the exact issue and i cannot find a solution.