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Bug#1097155: lcd4linux: ftbfs with GCC-15

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  Bug#1097155: lcd4linux: ftbfs with GCC-15 Reinhard Tartler <siretart@tauware.de> - 2025-11-22 17:20 +0100

#405131 — Bug#1097155: lcd4linux: ftbfs with GCC-15

Control: tag 1097155 help

Jonathan,

how are you? Long time no see.

Do you have capacity to look after lcd4linux?

It hasn't been touched in years, I'm thinking about requesting it to be 
removed from Debian.
Let me know what you think.

-rt

On 2025-02-17 12:30, Matthias Klose wrote:
> Package: src:lcd4linux
> Version: 0.11.0~svn1203-3
> Severity: important
> Tags: sid forky
> User: debian-gcc@lists.debian.org
> Usertags: ftbfs-gcc-15
> 
> [This bug is NOT targeted to the upcoming trixie 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-15/g++-15, but succeeds to build with gcc-14/g++-14. The
> severity of this report will be raised before the forky release.
> 
> The full build log can be found at:
> http://qa-logs.debian.net/2025/02/16/amd64exp/lcd4linux_0.11.0~svn1203-3_unstable_gccexp.log.gz
> The last lines of the build log are at the end of this report.
> 
> To build with GCC 15, either set CC=gcc-15 CXX=g++-15 explicitly,
> or install the gcc, g++, gfortran, ... packages from experimental.
> 
>   apt-get -t=experimental install g++
> 
> GCC 15 now defaults to the C23/C++23 standards, exposing many FTBFS.
> Other 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-15/porting_to.html
> 
> [...]
>       |                                 |
>       |                                 void (*)(RESULT *)
> evaluator.h:53:58: note: expected ‘void (*)(void)’ but argument is of 
> type ‘void (*)(RESULT *)’
>    53 | int AddFunction(const char *name, const int argc, void (*func) 
> ());
>       |                                                   
> ~~~~~~~^~~~~~~~
> drv_generic.c:78:13: note: ‘my_xres’ declared here
>    78 | static void my_xres(RESULT * result)
>       |             ^~~~~~~
> drv_generic.c:109:33: error: passing argument 3 of ‘AddFunction’ from 
> incompatible pointer type [-Wincompatible-pointer-types]
>   109 |     AddFunction("LCD::yres", 0, my_yres);
>       |                                 ^~~~~~~
>       |                                 |
>       |                                 void (*)(RESULT *)
> evaluator.h:53:58: note: expected ‘void (*)(void)’ but argument is of 
> type ‘void (*)(RESULT *)’
>    53 | int AddFunction(const char *name, const int argc, void (*func) 
> ());
>       |                                                   
> ~~~~~~~^~~~~~~~
> drv_generic.c:84:13: note: ‘my_yres’ declared here
>    84 | static void my_yres(RESULT * result)
>       |             ^~~~~~~
> drv_generic.c:111:38: error: passing argument 3 of ‘AddFunction’ from 
> incompatible pointer type [-Wincompatible-pointer-types]
>   111 |     AddFunction("Layout::height", 0, my_lrows);
>       |                                      ^~~~~~~~
>       |                                      |
>       |                                      void (*)(RESULT *)
> evaluator.h:53:58: note: expected ‘void (*)(void)’ but argument is of 
> type ‘void (*)(RESULT *)’
>    53 | int AddFunction(const char *name, const int argc, void (*func) 
> ());
>       |                                                   
> ~~~~~~~^~~~~~~~
> drv_generic.c:90:13: note: ‘my_lrows’ declared here
>    90 | static void my_lrows(RESULT * result)
>       |             ^~~~~~~~
> drv_generic.c:112:37: error: passing argument 3 of ‘AddFunction’ from 
> incompatible pointer type [-Wincompatible-pointer-types]
>   112 |     AddFunction("Layout::width", 0, my_lcols);
>       |                                     ^~~~~~~~
>       |                                     |
>       |                                     void (*)(RESULT *)
> evaluator.h:53:58: note: expected ‘void (*)(void)’ but argument is of 
> type ‘void (*)(RESULT *)’
>    53 | int AddFunction(const char *name, const int argc, void (*func) 
> ());
>       |                                                   
> ~~~~~~~^~~~~~~~
> drv_generic.c:96:13: note: ‘my_lcols’ declared here
>    96 | static void my_lcols(RESULT * result)
>       |             ^~~~~~~~
> make[2]: *** [Makefile:868: drv_generic.o] Error 1
> make[2]: *** Waiting for unfinished jobs....
> lcd4linux.c: In function ‘interactive_mode’:
> lcd4linux.c:112:10: warning: ignoring return value of ‘fgets’ declared 
> with attribute ‘warn_unused_result’ [-Wunused-result]
>   112 |     for (fgets(line, sizeof(line), stdin); !feof(stdin); 
> fgets(line, sizeof(line), stdin)) {
>       |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> lcd4linux.c:112:58: warning: ignoring return value of ‘fgets’ declared 
> with attribute ‘warn_unused_result’ [-Wunused-result]
>   112 |     for (fgets(line, sizeof(line), stdin); !feof(stdin); 
> fgets(line, sizeof(line), stdin)) {
>       |                                                          
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> evaluator.c: In function ‘EvalTree’:
> evaluator.c:1135:13: error: too many arguments to function 
> ‘Root->Function->func’; expected 0, have 3
>  1135 |             Root->Function->func(Root->Result, argc, &param);
>       |             ^~~~                 ~~~~~~~~~~~~
> evaluator.c:151:12: note: declared here
>   151 |     void (*func) ();
>       |            ^~~~
> evaluator.c:1137:13: error: too many arguments to function 
> ‘Root->Function->func’; expected 0, have 11
>  1137 |             Root->Function->func(Root->Result, param[0], 
> param[1], param[2], param[3], param[4], param[5], param[6],
>       |             ^~~~                 ~~~~~~~~~~~~
> evaluator.c:151:12: note: declared here
>   151 |     void (*func) ();
>       |            ^~~~
> make[2]: *** [Makefile:868: evaluator.o] Error 1
> make[2]: Leaving directory 
> '/build/reproducible-path/lcd4linux-0.11.0~svn1203'
> make[1]: *** [Makefile:619: all] Error 2
> make[1]: Leaving directory 
> '/build/reproducible-path/lcd4linux-0.11.0~svn1203'
> dh_auto_build: error: make -j8 returned exit code 2
> make: *** [debian/rules:43: binary] Error 25
> dpkg-buildpackage: error: debian/rules binary subprocess returned exit 
> status 2

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