[bug] Random ctest c_binding segfault on release build with gnu compilers

[dfnca]

Summary
cea_bindc_rp1311_ex2 generates a segfault (sometimes) when running ctest. I found that it doesn't happen all of the time; repeated executions might be necessary to observe the behavior. I was "lucky" that it happened to me on the first try of a new build.

Reproduction

• Interface: C (issue is with C interface unit test, not the actual interface)

• Minimal input / steps (attach .inp if relevant):

• make -DCEA_ENABLE_BIND_PYTHON=ON -DCEA_BUILD_TESTING=ON --preset core ..
  cmake --build .
  ctest --output-on-failure [NOTE: failure doesn't always occur, but repeatedly invoking the ctest results in a segfault on example 2]

• Command or API call used:

Expected behavior
What you expected to happen.
100% pass

Actual behavior
7/12 Test #7: cea_bindc_rp1311_ex2 .............***Exception: SegFault 1.07 sec
INFO: Reading thermo database file: data/thermo.lib
INFO: Reading 1269 gaseous products
INFO: Reading 991 condensed products
INFO: Reading 83 reactants
INFO: Building list of unique species
INFO: Found 2019 unique species
INFO: Building list of unique species
INFO: Found 80 unique species
INFO: Building list of unique elements
INFO: Found 59 unique elements
INFO: Reading transport database file: data/trans.lib
INFO: Building list of unique elements
INFO: Found 5 unique elements
INFO: BINDC: Created Mixture object at 0x37DE9050
INFO: Building list of unique elements
INFO: Found 5 unique elements
INFO: BINDC: Created Mixture object at 0x37DF30A0
INFO: BINDC: Created EqSolver from product mixture with options at 0x37C591A0
INFO: BINDC: Created EqSolution object at 0x37C5C2C0
INFO: BINDC: Created EqPartials object at 0x37D53D30

  Start  8: cea_bindc_rp1311_ex3

8/12 Test #8: cea_bindc_rp1311_ex3 ............. Passed 0.01 sec
Start 9: cea_bindc_rp1311_ex6
9/12 Test #9: cea_bindc_rp1311_ex6 ............. Passed 0.01 sec
Start 10: cea_bindc_rp1311_ex7
10/12 Test #10: cea_bindc_rp1311_ex7 ............. Passed 0.01 sec
Start 11: cea_bindc_rp1311_ex8
11/12 Test #11: cea_bindc_rp1311_ex8 ............. Passed 0.00 sec
Start 12: cea_bindc_rp1311_ex9
12/12 Test #12: cea_bindc_rp1311_ex9 ............. Passed 0.01 sec

92% tests passed, 1 tests failed out of 12

Total Test time (real) = 1.23 sec

The following tests FAILED:
7 - cea_bindc_rp1311_ex2 (SEGFAULT)
Errors while running CTest

Environment

• OS: Ubuntu 13.3.0-6ubuntu2~24.04
• CEA version/commit: [a09e328]
• Compiler or Python version (if relevant): gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0

Additional context
The compiler issues multiple warnings on the C binding tests. One of them pointed to the cause of the segfaults that I observed.

This is an easy fix so I will put in a PR

[markleader]

Closed by #21