# acx_pthread.m4 - Configure pthreads for the host system. -*-Shell-script-*- ## http://www.gnu.org/software/ac-archive/Installed_Packages/acx_pthread.html ## Steven G. Johnson and Alejandro Forero Cuervo ## AC_DEFUN([ACX_PTHREAD], [ AC_REQUIRE([AC_CANONICAL_HOST]) AC_LANG_SAVE AC_LANG_C acx_pthread_ok=no # We used to check for pthread.h first, but this fails if pthread.h # requires special compiler flags (e.g. on True64 or Sequent). # It gets checked for in the link test anyway. # First of all, check if the user has set any of the PTHREAD_LIBS, # etcetera environment variables, and if threads linking works using # them: if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $PTHREAD_CFLAGS" save_LIBS="$LIBS" LIBS="$PTHREAD_LIBS $LIBS" AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS]) AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes) AC_MSG_RESULT($acx_pthread_ok) if test x"$acx_pthread_ok" = xno; then PTHREAD_LIBS="" PTHREAD_CFLAGS="" fi LIBS="$save_LIBS" CFLAGS="$save_CFLAGS" fi # We must check for the threads library under a number of different # names; the ordering is very important because some systems # (e.g. DEC) have both -lpthread and -lpthreads, where one of the # libraries is broken (non-POSIX). # Create a list of thread flags to try. Items starting with a "-" are # C compiler flags, and other items are library names, except for "none" # which indicates that we try without any flags at all. acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt" # The ordering *is* (sometimes) important. Some notes on the # individual items follow: # pthreads: AIX (must check this before -lpthread) # none: in case threads are in libc; should be tried before -Kthread and # other compiler flags to prevent continual compiler warnings # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h) # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able) # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread) # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads) # -pthreads: Solaris/gcc # -mthreads: Mingw32/gcc, Lynx/gcc # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it # doesn't hurt to check since this sometimes defines pthreads too; # also defines -D_REENTRANT) # pthread: Linux, etcetera # --thread-safe: KAI C++ case "${host_cpu}-${host_os}" in *solaris*) # On Solaris (at least, for some versions), libc contains stubbed # (non-functional) versions of the pthreads routines, so link-based # tests will erroneously succeed. (We need to link with -pthread or # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather # a function called by this macro, so we could check for that, but # who knows whether they'll stub that too in a future libc.) So, # we'll just look for -pthreads and -lpthread first: acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags" ;; esac if test x"$acx_pthread_ok" = xno; then for flag in $acx_pthread_flags; do case $flag in none) AC_MSG_CHECKING([whether pthreads work without any flags]) ;; -*) AC_MSG_CHECKING([whether pthreads work with $flag]) PTHREAD_CFLAGS="$flag" ;; *) AC_MSG_CHECKING([for the pthreads library -l$flag]) PTHREAD_LIBS="-l$flag" ;; esac save_LIBS="$LIBS" save_CFLAGS="$CFLAGS" LIBS="$PTHREAD_LIBS $LIBS" CFLAGS="$CFLAGS $PTHREAD_CFLAGS" # Check for various functions. We must include pthread.h, # since some functions may be macros. (On the Sequent, we # need a special flag -Kthread to make this header compile.) # We check for pthread_join because it is in -lpthread on IRIX # while pthread_create is in libc. We check for pthread_attr_init # due to DEC craziness with -lpthreads. We check for # pthread_cleanup_push because it is one of the few pthread # functions on Solaris that doesn't have a non-functional libc stub. # We try pthread_create on general principles. AC_TRY_LINK([#include ], [pthread_t th; pthread_join(th, 0); pthread_attr_init(0); pthread_cleanup_push(0, 0); pthread_create(0,0,0,0); pthread_cleanup_pop(0); ], [acx_pthread_ok=yes]) LIBS="$save_LIBS" CFLAGS="$save_CFLAGS" AC_MSG_RESULT($acx_pthread_ok) if test "x$acx_pthread_ok" = xyes; then break; fi PTHREAD_LIBS="" PTHREAD_CFLAGS="" done fi # Various other checks: if test "x$acx_pthread_ok" = xyes; then save_LIBS="$LIBS" LIBS="$PTHREAD_LIBS $LIBS" save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS $PTHREAD_CFLAGS" # Detect AIX lossage: threads are created detached by default # and the JOINABLE attribute has a nonstandard name (UNDETACHED). AC_MSG_CHECKING([for joinable pthread attribute]) AC_TRY_LINK([#include ], [int attr=PTHREAD_CREATE_JOINABLE;], ok=PTHREAD_CREATE_JOINABLE, ok=unknown) if test x"$ok" = xunknown; then AC_TRY_LINK([#include ], [int attr=PTHREAD_CREATE_UNDETACHED;], ok=PTHREAD_CREATE_UNDETACHED, ok=unknown) fi if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then AC_DEFINE(PTHREAD_CREATE_JOINABLE, $ok, [Define to the necessary symbol if this constant uses a non-standard name on your system.]) fi AC_MSG_RESULT(${ok}) if test x"$ok" = xunknown; then AC_MSG_WARN([we do not know how to create joinable pthreads]) fi AC_MSG_CHECKING([if more special flags are required for pthreads]) flag=no case "${host_cpu}-${host_os}" in *-aix* | *-freebsd*) flag="-D_THREAD_SAFE";; *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";; esac AC_MSG_RESULT(${flag}) if test "x$flag" != xno; then PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS" fi LIBS="$save_LIBS" CFLAGS="$save_CFLAGS" # More AIX lossage: must compile with cc_r AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC}) else PTHREAD_CC="$CC" fi AC_SUBST(PTHREAD_LIBS) AC_SUBST(PTHREAD_CFLAGS) AC_SUBST(PTHREAD_CC) # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND: if test x"$acx_pthread_ok" = xyes; then ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1]) : else acx_pthread_ok=no $2 fi AC_LANG_RESTORE ])dnl ACX_PTHREAD dnl ACX_C99_INT_TYPE([symbol], [signed/unsigned], [size in bytes], [out file]) AC_DEFUN([ACX_C99_INT_TYPE], [ if test "${ac_cv_sizeof_long_long}" = "$3"; then echo "typedef $2 long long $1;" >> $4 elif test "${ac_cv_sizeof___int64}" = "$3"; then echo "typedef $2 __int64 $1;" >> $4 elif test "${ac_cv_sizeof_long}" = "$3"; then echo "typedef $2 long $1;" >> $4 elif test "${ac_cv_sizeof_int}" = "$3"; then echo "typedef $2 int $1;" >> $4 elif test "${ac_cv_sizeof_short}" = "$3"; then echo "typedef $2 short $1;" >> $4 else AC_MSG_ERROR([Unable to determine an appropriate type for $1!]) fi ]) AC_DEFUN([ACX_C99_TYPES], [ AC_REQUIRE([AC_CANONICAL_HOST]) AC_LANG_PUSH(C) echo "/* This file is automatically generated by configure. DO NOT EDIT! */" > safestr-c99.h echo "#ifndef SAFESTR_C99_H" >> safestr-c99.h echo "#define SAFESTR_C99_H" >> safestr-c99.h echo "" >> safestr-c99.h acx_c99_headers=no if test "${ac_cv_header_inttypes_h}" = "yes"; then echo '#include ' >> safestr-c99.h acx_c99_headers=yes fi if test "${ac_cv_header_stdint_h}" = "yes"; then echo '#include ' >> safestr-c99.h acx_c99_headers=yes fi if test "${acx_c99_headers}" = "yes"; then echo "" >> safestr-c99.h fi acx_c99_typedefs=no if test "${ac_cv_type_int32_t}" != "yes"; then ACX_C99_INT_TYPE([int32_t], signed, 4, [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_u_int32_t}" != "yes"; then ACX_C99_INT_TYPE([u_int32_t], unsigned, 4, [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_int64_t}" != "yes"; then ACX_C99_INT_TYPE([int64_t], signed, 8, [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_u_int64_t}" != "yes"; then ACX_C99_INT_TYPE([u_int64_t], unsigned, 8, [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_intmax_t}" != "yes" -o "${ac_cv_type_uintmax_t}" != "yes"; then acx_c99_intmax=0 acx_c99_intmax_t="none" acx_c99_typedefs=yes if test "${ac_cv_sizeof_short}" -gt "${acx_c99_intmax}"; then acx_c99_intmax="${ac_cv_sizeof_short}" acx_c99_intmax_t="short" fi if test "${ac_cv_sizeof_int}" -gt "${acx_c99_intmax}"; then acx_c99_intmax="${ac_cv_sizeof_int}" acx_c99_intmax_t="int" fi if test "${ac_cv_sizeof_long}" -gt "${acx_c99_intmax}"; then acx_c99_intmax="${ac_cv_sizeof_long}" acx_c99_intmax_t="long" fi if test "${ac_cv_sizeof___int64}" -gt "${acx_c99_intmax}"; then acx_c99_intmax="${ac_cv_sizeof___int64}" acx_c99_intmax_t="__int64" fi if test "${ac_cv_sizeof_long_long}" -gt "${acx_c99_intmax}"; then acx_c99_intmax="${ac_cv_sizeof_long_long}" acx_c99_intmax_t="long long" fi if test "${acx_c99_intmax}" = "0"; then AC_MSG_ERROR([Unable to determine maximum integer size!]) fi if test "${ac_cv_type_intmax_t}" != "yes"; then echo "typedef signed ${acx_c99_intmax_t} intmax_t;" >> safestr-c99.h fi if test "${ac_cv_type_uintmax_t}" != "yes"; then echo "typedef unsigned ${acx_c99_intmax_t} uintmax_t;" >> safestr-c99.h fi fi if test "${ac_cv_type_ptrdiff_t}" != "yes"; then ACX_C99_INT_TYPE([ptrdiff_t], signed, [${ac_cv_sizeof_void_p}], [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_uptrdiff_t}" != "yes"; then ACX_C99_INT_TYPE([uptrdiff_t], unsigned, [${ac_cv_sizeof_void_p}], [safestr-c99.h]) acx_c99_typedefs=yes fi if test "${ac_cv_type_size_t}" != "yes"; then echo "typedef unsigned int size_t;" >> safestr-c99.h acx_c99_typedefs=yes fi if test "${ac_cv_type_ssize_t}" != "yes"; then if test "${ac_cv_sizeof_size_t}" -gt "0"; then ACX_C99_INT_TYPE([ssize_t], signed, [${ac_cv_sizeof_size_t}], [safestr-c99.h]) else echo "typedef signed int size_t;" >> safestr-c99.h fi acx_c99_typedefs=yes fi if test "${acx_c99_typedefs}" = "yes"; then echo "" >> safestr-c99.h fi echo "#endif /* SAFESTR_C99_H */" >> safestr-c99.h AC_LANG_POP ])