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We were using some functions (like strdup) without defining the required feature macros. For instance, strdup requires `_POSIX_C_SOURCE >= 200809L`, and vasprintf _GNU_SOURCE. This was causing some SEGFAULT because the functions were assumed to have the signature `int f()`. Fix this by defining `_DEFAULT_SOURCE` (which defines `_POSIX_C_SOURCE >= 200809L`) and _GNU_SOURCE.
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We were using some functions (like strdup) without defining the required feature
macros. For instance, strdup requires
_POSIX_C_SOURCE >= 200809L, andvasprintf _GNU_SOURCE. This was causing some SEGFAULT because the functions were
assumed to have the signature
int f(), but returned something of a different size (as strdup).Fix this by defining
_DEFAULT_SOURCE(which defines_POSIX_C_SOURCE >= 200809L) and_GNU_SOURCE.Note: this should not impact the system that doesn't have the impacted functions for the functions we check with
CHECK_FUNCTION_EXISTS.