Bug#1096565: edge-addition-planarity-suite: ftbfs with GCC-15

[Matthias Klose]

Package: src:edge-addition-planarity-suite
Version: 3.0.2.0-2.1
Severity: important
Tags: sid forky
User: debian-gcc at 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/edge-addition-planarity-suite_3.0.2.0-2.1_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

[...]
  469 |                  RetVal = theGraph->functions.fpReadPostprocess(theGraph, extraData, extraDataLen);
      |                           ^~~~~~~~                              ~~~~~~~~
c/graphFunctionTable.h:45:16: note: declared here
   45 |         int  (*fpReadPostprocess)();
      |                ^~~~~~~~~~~~~~~~~
c/graphIO.c: In function 'gp_Write':
c/graphIO.c:814:19: error: too many arguments to function 'theGraph->functions.fpWritePostprocess'; expected 0, have 3
  814 |          RetVal = theGraph->functions.fpWritePostprocess(theGraph, &extraData, &extraDataSize);
      |                   ^~~~~~~~                               ~~~~~~~~
c/graphFunctionTable.h:46:16: note: declared here
   46 |         int  (*fpWritePostprocess)();
      |                ^~~~~~~~~~~~~~~~~~
c/graphIO.c: In function 'gp_WriteToString':
c/graphIO.c:878:23: error: too many arguments to function 'theGraph->functions.fpWritePostprocess'; expected 0, have 3
  878 |              RetVal = theGraph->functions.fpWritePostprocess(theGraph, &extraData, &extraDataSize);
      |                       ^~~~~~~~                               ~~~~~~~~
c/graphFunctionTable.h:46:16: note: declared here
   46 |         int  (*fpWritePostprocess)();
      |                ^~~~~~~~~~~~~~~~~~
c/graphIO.c: In function '_ReadAdjMatrix':
c/graphIO.c:38:9: warning: ignoring return value of 'fscanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         fscanf(Infile, " %d ", &N);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:60:27: warning: ignoring return value of 'fscanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |                           fscanf(Infile, " %1d", &Flag);
      |                           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c: In function '_ReadAdjList':
c/graphIO.c:118:10: warning: ignoring return value of 'fscanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  118 |          fscanf(Infile, " %d ", &N);
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:144:19: warning: ignoring return value of 'fscanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  144 |                   fscanf(Infile, "%d", &indexValue);
      |                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:205:26: warning: ignoring return value of 'fscanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  205 |                          fscanf(Infile, " %d ", &W);
      |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c: In function '_ReadLEDAGraph':
c/graphIO.c:319:5: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  319 |     fgets(Line, 255, Infile);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:320:5: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  320 |     fgets(Line, 255, Infile);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:321:5: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  321 |     fgets(Line, 255, Infile);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:324:5: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  324 |     fgets(Line, 255, Infile);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:331:9: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  331 |         fgets(Line, 255, Infile);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:334:5: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  334 |     fgets(Line, 255, Infile);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c:340:9: warning: ignoring return value of 'fgets' declared with attribute 'warn_unused_result' [-Wunused-result]
  340 |         fgets(Line, 255, Infile);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~
c/graphIO.c: In function 'gp_Read':
c/graphIO.c:405:13: warning: ignoring return value of 'fread' declared with attribute 'warn_unused_result' [-Wunused-result]
  405 |             fread(extraData, fileSize - filePos, 1, Infile);
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:905: c/graphEmbed.lo] Error 1
make[2]: *** [Makefile:905: c/graphIO.lo] Error 1
make[2]: Leaving directory '/build/reproducible-path/edge-addition-planarity-suite-3.0.2.0'
make[1]: *** [Makefile:1007: all-recursive] Error 1
make[1]: Leaving directory '/build/reproducible-path/edge-addition-planarity-suite-3.0.2.0'
dh_auto_build: error: make -j8 returned exit code 2
make: *** [debian/rules:6: binary] Error 25
dpkg-buildpackage: error: debian/rules binary subprocess returned exit status 2