Bug#984152: giac: ftbfs with GCC-11

[Matthias Klose]

Package: src:giac
Version: 1.6.0.41+dfsg1-1
Severity: normal
Tags: sid bookworm
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-11

[This bug is not targeted to the upcoming bullseye release]

Please keep this issue open in the bug tracker for the package it
was filed for.  If a fix in another package is required, please
file a bug for the other package (or clone), and add a block in this
package. Please keep the issue open until the package can be built in
a follow-up test rebuild.

The package fails to build in a test rebuild on at least amd64 with
gcc-11/g++-11, but succeeds to build with gcc-10/g++-10. The
severity of this report will be raised before the bookworm release,
so nothing has to be done for the bullseye release.

The full build log can be found at:
http://people.debian.org/~doko/logs/20210228/filtered/gcc11/giac_1.6.0.41+dfsg1-1_unstable_gcc11.log
The last lines of the build log are at the end of this report.

To build with GCC 11, either set CC=gcc-11 CXX=g++-11 explicitly,
or install the gcc, g++, gfortran, ... packages from experimental.

  apt-get -t=experimental install g++ 

Common build failures are new warnings resulting in build failures with
-Werror turned on, or new/dropped symbols in Debian symbols files.
For other C/C++ related build failures see the porting guide at
http://gcc.gnu.org/gcc-11/porting_to.html

GCC 11 defaults to the GNU++17 standard.  If your package installs
header files in /usr/include, please don't work around C++17 issues
by choosing a lower C++ standard for the package build, but fix these
issues to build with the C++17 standard.

[...]
 2667 |       int i=fl_ask("%s",gettext("Sorting is not compatible with some cell references. Sort anyway"),gettext("Yes"),gettext("No"));
      |                                                                                                                                 ^
In file included from /usr/include/FL/fl_message.H:19,
                 from Tableur.h:38,
                 from Tableur.cc:28:
/usr/include/FL/fl_ask.H:55:15: note: declared here
   55 | FL_EXPORT int fl_ask(const char *,...) __fl_attr((__format__ (__printf__, 1, 2), __deprecated__));
      |               ^~~~~~
Editeur.cc: In function ‘void xcas::cb_Editeur_Load(Fl_Widget*, void*)’:
Editeur.cc:502:50: warning: ‘int fl_ask(const char*, ...)’ is deprecated [-Wdeprecated-declarations]
  502 |         int i=fl_ask("%s","Buffer changed. Save?");
      |                                                  ^
In file included from /usr/include/FL/fl_message.H:19,
                 from Editeur.h:42,
                 from Editeur.cc:2:
/usr/include/FL/fl_ask.H:55:15: note: declared here
   55 | FL_EXPORT int fl_ask(const char *,...) __fl_attr((__format__ (__printf__, 1, 2), __deprecated__));
      |               ^~~~~~
Editeur.cc: In function ‘void xcas::editeur_export(Fl_Text_Editor*, const string&, int)’:
Editeur.cc:613:59: warning: ‘int fl_ask(const char*, ...)’ is deprecated [-Wdeprecated-declarations]
  613 |       int i=fl_ask("%s",gettext("File exists. Overwrite?"));
      |                                                           ^
In file included from /usr/include/FL/fl_message.H:19,
                 from Editeur.h:42,
                 from Editeur.cc:2:
/usr/include/FL/fl_ask.H:55:15: note: declared here
   55 | FL_EXPORT int fl_ask(const char *,...) __fl_attr((__format__ (__printf__, 1, 2), __deprecated__));
      |               ^~~~~~
Editeur.cc: In function ‘void xcas::cb_Editeur_Save_as(Fl_Widget*, void*)’:
Editeur.cc:765:77: warning: ‘int fl_ask(const char*, ...)’ is deprecated [-Wdeprecated-declarations]
  765 |         int i=fl_ask("%s",(tmp+gettext(": file exists. Overwrite?")).c_str());
      |                                                                             ^
In file included from /usr/include/FL/fl_message.H:19,
                 from Editeur.h:42,
                 from Editeur.cc:2:
/usr/include/FL/fl_ask.H:55:15: note: declared here
   55 | FL_EXPORT int fl_ask(const char *,...) __fl_attr((__format__ (__printf__, 1, 2), __deprecated__));
      |               ^~~~~~
Editeur.cc: In function ‘void xcas::cb_Editeur_Next(Fl_Widget*, void*)’:
Editeur.cc:1378:18: warning: too many arguments for format [-Wformat-extra-args]
 1378 |         fl_alert("%s","No more occurrences of '%s' found!", e->search.c_str());
      |                  ^~~~
Editeur.cc: In function ‘void xcas::cb_Editeur_Search(Fl_Widget*, void*)’:
Editeur.cc:1543:57: warning: ‘int fl_ask(const char*, ...)’ is deprecated [-Wdeprecated-declarations]
 1543 |               i=fl_ask("%s","Really replace by nothing?");
      |                                                         ^
In file included from /usr/include/FL/fl_message.H:19,
                 from Editeur.h:42,
                 from Editeur.cc:2:
/usr/include/FL/fl_ask.H:55:15: note: declared here
   55 | FL_EXPORT int fl_ask(const char *,...) __fl_attr((__format__ (__printf__, 1, 2), __deprecated__));
      |               ^~~~~~
Editeur.cc:1596:24: warning: too many arguments for format [-Wformat-extra-args]
 1596 |               fl_alert("%s","No occurrences of '%s' found!", e->search.c_str());
      |                        ^~~~
Tableur.cc: In function ‘bool xcas::csv_guess(const string&, char&, char&, char&)’:
Tableur.cc:1092:10: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
 1092 |     fread(data,size,count,f);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~
make[3]: *** [Makefile:968: Tableur.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
libtool: compile:  g++ -DHAVE_CONFIG_H -I. -I.. -DIN_GIAC -I. -I.. -I. -I.. -Wdate-time -D_FORTIFY_SOURCE=2 -g -O2 -ffile-prefix-map=/<<PKGBUILDDIR>>=. -fstack-protector-strong -Wformat -Werror=format-security -fno-strict-aliasing -DGIAC_GENERIC_CONSTANTS -DHAVE_LIBMICROPYTHON -fpermissive -c Editeur.cc -o Editeur.o >/dev/null 2>&1
make[3]: Leaving directory '/<<PKGBUILDDIR>>/src'
make[2]: *** [Makefile:620: all] Error 2
make[2]: Leaving directory '/<<PKGBUILDDIR>>/src'
dh_auto_build: error: cd src && make -j4 "INSTALL=install --strip-program=true" returned exit code 2
make[1]: *** [debian/rules:35: override_dh_auto_build-arch] Error 25
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:7: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2