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Reduce <limits.h> pollution due to dynamic PTHREAD_STACK_MIN

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<limits.h> used to be a header file with no declarations.
GCC's libgomp includes it in a #pragma GCC visibility hidden block.
Including <unistd.h> from <limits.h> (indirectly) declares everything
in <unistd.h> with hidden visibility, resulting in linker failures.

This commit avoids C declarations in assembler mode and only declares
__sysconf in <limits.h> (and not the entire contents of <unistd.h>).
The __sysconf symbol is already part of the ABI.  PTHREAD_STACK_MIN
is no longer defined for __USE_DYNAMIC_STACK_SIZE && __ASSEMBLER__
because there is no possible definition.

Additionally, PTHREAD_STACK_MIN is now defined by <pthread.h> for
__USE_MISC because this is what developers expect based on the macro
name.  It also helps to avoid libgomp linker failures in GCC because
libgomp includes <pthread.h> before its visibility hacks.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer
2021-07-12 18:43:32 +02:00
parent 8235f9311b
commit aaacde11f2
7 changed files with 47 additions and 17 deletions
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7
sysdeps/unix/sysv/linux/include/bits/pthread_stack_min-dynamic.h Normal file
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@ -0,0 +1,7 @@
/* Don't define PTHREAD_STACK_MIN to __sysconf (_SC_THREAD_STACK_MIN)
for glibc build. */
#ifdef _ISOMAC
# include <sysdeps/unix/sysv/linux/bits/pthread_stack_min-dynamic.h>
#else
# include <bits/pthread_stack_min.h>
#endif