search for: so_init_fn

...global variable initialized to 1 and discards init_fn(). Now, what happens if the executable is later linked against a shared library which has its own constructor and sets "val" to some non-zero value? I mean this for instance: extern int val; static void __attribute__((constructor)) so_init_fn(void) { val = 1; } I would expect the main program to return 2, not 1. Last thing, if I define "val" as volatile, the programs behaves as expected. Are we in "unspecified, just don't do this" territory here? Thanks, -- Jerome > > On Thu, Jun 11, 2020 at 10:12 A...

Hi, I think that Clang erroneously discards a function annotated with __attribute__((constructor)) when flags -Os -fno-common are given. Test case below. What do you think? Thanks. ----8<--------8<--------8<--------8<--------8<--------8<-------- $ cat ctor.c int val; static void __attribute__((constructor)) init_fn(void) { val = 1; } int main(int argc, char *argv[])