Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455

.github/scripts/flags-coverage.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+. .github/scripts/flags-clang.sh
+
+add_ld_flag -Wl,-z,defs
+
+# Make compilation error on a warning
+add_flag -Werror
+
+# Coverage flags.
+add_flag --coverage
+
+# Optimisation, but keep stack traces useful.
+add_c_flag -fno-inline -fno-omit-frame-pointer
+
+# Show useful stack traces on crash.
+add_flag -fsanitize=undefined -fno-sanitize-recover=all
+
+# In test code (_test.cc and libgtest), throw away all debug information.
+# We only care about stack frames inside toxcore (which is C). Without this,
+# mallocfail will spend a lot of time finding all the ways in which gtest can
+# fail to allocate memory, which is not interesting to us.
+add_cxx_flag -g0
+
+# Continue executing code in error paths so we can see it cleanly exit (and the
+# test code itself may abort).
+add_flag -DABORT_ON_LOG_ERROR=false