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Slim down static binaries by avoiding stdio.

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It's okay for a program to choose to drag in stdio, but it's unfortunate
if even the minimal "int main() { return 42; }" drags in stdio...

This brings the minimal static binary on ARM down from 78KiB to 46KiB.

Given that we don't have a separate -lpthread it's not obvious to me that
we can shave this down any further. I'm not sure whether this is a worthwhile
change for that reason. (And the fact that dynamic binaries, the usual case,
are unaffected either way.)

Change-Id: I02f91dcff37d14354314a30b72fed2563f431c88
This commit is contained in:
Elliott Hughes
2014-07-10 12:34:23 -07:00
parent f0f8cd1ff3
commit 91570ce987
9 changed files with 19 additions and 16 deletions
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5
libc/stdlib/atexit.c
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@@ -103,7 +103,7 @@ __cxa_atexit(void (*func)(void *), void *arg, void *dso)
{
struct atexit *p = __atexit;
struct atexit_fn *fnp;
size_t pgsize = sysconf(_SC_PAGESIZE);
size_t pgsize = getpagesize();
int ret = -1;
if (pgsize < sizeof(*p))
@@ -219,7 +219,7 @@ void
__atexit_register_cleanup(void (*func)(void))
{
struct atexit *p;
size_t pgsize = sysconf(_SC_PAGESIZE);
size_t pgsize = getpagesize();
if (pgsize < sizeof(*p))
return;
@@ -248,4 +248,3 @@ __atexit_register_cleanup(void (*func)(void))
unlock:
_ATEXIT_UNLOCK();
}