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cf: link libatomic if needed

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heimdal uses 8-byte (64-bits) atomic operations for a while now (ie in
lib/krb5/krcache.c). however some platforms (ie i386, i486, ARM < 7)
don't support them natively and need to be linked against libatomic in
order to implement functionallity from <stdatomic.h>.

if the header was found check 64-bit atomics work without any additional
libraries. if not try to add linking with libatomic. if that fails as
well fallback to -DHEIM_BASE_ATOMICS_FALLBACK

no change for platfroms without <stdatomic.h>

Fixes: #1186
This commit is contained in:
Jan Palus
2024-01-04 14:05:58 +01:00
committed by Nico Williams
parent 3171398867
commit ff41f2ae7c
1 changed files with 18 additions and 1 deletions
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19
configure.ac
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@@ -433,7 +433,6 @@ AC_CHECK_HEADERS([\
signal.h \ signal.h \
strings.h \ strings.h \
stropts.h \ stropts.h \
stdatomic.h \
sys/bitypes.h \ sys/bitypes.h \
sys/category.h \ sys/category.h \
sys/file.h \ sys/file.h \
@@ -464,6 +463,24 @@ AC_CHECK_HEADERS([\
util.h \ util.h \
]) ])
AC_CHECK_HEADERS([stdatomic.h],
[AC_MSG_CHECKING([whether libatomic is required])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdatomic.h>]], [[_Atomic(long long) i; atomic_init(&i, (long long) 0);]])],
[AC_MSG_RESULT([no])],
[AC_MSG_RESULT([yes])
AC_MSG_CHECKING([whether libatomic works])
save_LIBS="$LIBS"
LIBS="$LIBS -latomic"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdatomic.h>]], [[_Atomic(long long) i; atomic_init(&i, (long long) 0);]])],
[AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no, using fallback])
LIBS="$save_LIBS"
AC_DEFINE([HEIM_BASE_ATOMICS_FALLBACK], [], [Define if you want fallbacks for atomic operations])]
)]
)],
[]
)
dnl On Solaris 8 there's a compilation warning for term.h because dnl On Solaris 8 there's a compilation warning for term.h because
dnl it doesn't define `bool'. dnl it doesn't define `bool'.
AC_CHECK_HEADERS(term.h, , , -) AC_CHECK_HEADERS(term.h, , , -)