diff options
| author | Mike Frysinger | 2007-09-07 16:55:36 +0200 |
|---|---|---|
| committer | Karel Zak | 2007-09-20 00:22:22 +0200 |
| commit | 72065909ccd29cd3c7c3105c95ba2434db304552 (patch) | |
| tree | 0e8705d5cfc36f60fd9d2500b1c9023ed098c5a0 /configure.ac | |
| parent | build-sys: nls/locale handling in util-linux-ng general (diff) | |
| download | kernel-qcow2-util-linux-72065909ccd29cd3c7c3105c95ba2434db304552.tar.gz kernel-qcow2-util-linux-72065909ccd29cd3c7c3105c95ba2434db304552.tar.xz kernel-qcow2-util-linux-72065909ccd29cd3c7c3105c95ba2434db304552.zip | |
build-sys: unify method for checking system calls and fallback handling
Co-Author: Stepan Kasal <skasal@redhat.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Stepan Kasal <skasal@redhat.com>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 83 |
1 files changed, 69 insertions, 14 deletions
diff --git a/configure.ac b/configure.ac index e7cfca3cd..b23395fd5 100644 --- a/configure.ac +++ b/configure.ac @@ -187,24 +187,79 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ ]) -AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ +dnl UTIL_CHECK_SYSCALL(SYSCALL, FALLBACK, ...) +dnl Only specify FALLBACK if the SYSCALL +dnl you're checking for is a "newish" one +dnl ------------------------------------- +AC_DEFUN([UTIL_CHECK_SYSCALL], [ + dnl This macro uses host_cpu. + AC_REQUIRE([AC_CANONICAL_HOST]) + AC_CACHE_CHECK([for syscall $1], + [util_cv_syscall_$1], + [_UTIL_SYSCALL_CHECK_DECL([SYS_$1], + [syscall=SYS_$1], + [dnl Our libc failed use, so see if we can get the kernel + dnl headers to play ball ... + _UTIL_SYSCALL_CHECK_DECL([_NR_$1], + [syscall=_NR_$1], + [ + syscall=no + case $host_cpu in + _UTIL_CHECK_SYSCALL_FALLBACK(m4_shift($@)) + esac + ]) + ]) + util_cv_syscall_$1=$syscall + ]) + AM_CONDITIONAL([HAVE_]m4_toupper($1), [test $util_cv_syscall_$1 != no]) + case $util_cv_syscall_$1 in #( + no) AC_MSG_WARN([Unable to detect syscall $1.]) ;; + SYS_*) ;; + *) AC_DEFINE_UNQUOTED([SYS_$1], [$util_cv_syscall_$1], + [Fallback syscall number for $1]) ;; + esac +]) + +dnl _UTIL_SYSCALL_CHECK_DECL(SYMBOL, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND) +dnl Check if SYMBOL is declared, using the headers needed for syscall checks. +dnl ------------------------------------- +m4_define([_UTIL_SYSCALL_CHECK_DECL], +[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ #include <sys/syscall.h> #include <unistd.h> -]], [[ -int test = SYS_pivot_root; -]])], -[AM_CONDITIONAL(HAVE_PIVOT_ROOT, true)], -[AM_CONDITIONAL(HAVE_PIVOT_ROOT, false)]) +]], [[int test = $1;]])], +[$2], [$3]) +]) +dnl _UTIL_CHECK_SYSCALL_FALLBACK(PATTERN, VALUE, ...) +dnl Helper macro to create the body for the above `case'. +dnl ------------------------------------- +m4_define([_UTIL_CHECK_SYSCALL_FALLBACK], +[m4_ifval([$1], + [#( + $1) syscall="$2" ;;dnl + _UTIL_CHECK_SYSCALL_FALLBACK(m4_shiftn(2, $@))])dnl +]) -AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ -#include <sys/syscall.h> -#include <unistd.h> -]], [[ -int test = SYS_sched_getaffinity; -]])], -[AM_CONDITIONAL(HAVE_SCHED_GETAFFINITY, true)], -[AM_CONDITIONAL(HAVE_SCHED_GETAFFINITY, false)]) + +UTIL_CHECK_SYSCALL([pivot_root]) +UTIL_CHECK_SYSCALL([sched_getaffinity]) +UTIL_CHECK_SYSCALL([ioprio_set], + [alpha], [442], + [i*86], [289], + [ia64*], [1274], + [powerpc*], [273], + [s390*], [282], + [sparc*], [196], + [x86_64*], [251]) +UTIL_CHECK_SYSCALL([ioprio_get], + [alpha], [443], + [i*86], [290], + [ia64*], [1275], + [powerpc*], [274], + [s390*], [283], + [sparc*], [218], + [x86_64*], [252]) AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ |