mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
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d2ea8bd070
The build system does not honor the flags set externally and replaces it with the pthread-only flags when detecting pthread availability. This breaks the configuration of cairo in some cross-compilation environments: conftest.c:1: note: someone does not honour COPTS correctly, passed 0 times The test for pthread should append the new flags to the old one.
253 lines
8.4 KiB
Text
253 lines
8.4 KiB
Text
dnl Defines the macro CAIRO_CONFIGURE_PTHREAD to find a suitable
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dnl pthread implementation. There are two levels of pthread conformance
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dnl we are looking for:
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dnl
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dnl a) A minimal level denoted by -DCAIRO_HAS_PTHREAD=1: This level
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dnl requires mutex and recursive mutexattr support. If possible we try
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dnl to use weakly linked stubs from libc over the real pthread library.
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dnl This level is required by the cairo library proper. If the user
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dnl invokes configure with --enable-pthread=yes or
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dnl --enable-pthread=always then we avoid trying to use weak stubs.
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dnl
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dnl b) A full level denoted by -DCAIRO_HAS_REAL_PTHREAD=1: This level
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dnl requires full support from a real pthread library, including thread
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dnl creation, joins, thread attribtues, etc. This level is required by
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dnl multithreaded applications using cairo, such as the test suite
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dnl binaries and cairo utilities.
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dnl
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dnl Usage:
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dnl CAIRO_ENABLE(pthread, pthread, <default yes|no|auto|always>,
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dnl [CAIRO_CONFIGURE_PTHREAD])
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dnl
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dnl This should be invoked near the end of configure.ac so that
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dnl the pthread specific CFLAGS and LIBS end up at the front
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dnl of CAIRO_CFLAGS and CAIRO_LIBS -- this helps ensure that we
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dnl really do get non-weak symbols from the actual pthread library
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dnl rather than possible stubs in other libraries.
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dnl
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dnl The user can override the choices made by
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dnl CAIRO_CONFIGURE_PTHREAD by using --enable-pthread=yes and
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dnl giving PTHREAD_CFLAGS and PTHREAD_LIBS to configure.
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dnl
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dnl Sets environment variables:
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dnl use_pthread="yes" | "no (<errmsg>)"
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dnl have_pthread="yes" | "no (<errmsg)"
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dnl have_real_pthread="yes" | "no (<errmsg)"
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dnl pthread_{CFLAGS,LIBS,REQUIRES}
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dnl real_pthread_{CFLAGS,LIBS}
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dnl
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dnl Autoconfigured defines in config.h (conditional):
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dnl CAIRO_HAS_PTHREAD
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dnl CAIRO_HAS_REAL_PTHREAD
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dnl
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dnl -----------------------------------------------------------------------
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dnl A program to test all the pthread features we need to be able to
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dnl compile libcairo itself. We could test the features independently,
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dnl but we need all of them anyway.
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m4_define([libcairo_pthread_program],[dnl
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE /* for PTHREAD_MUTEX_INITIALIZER under linux */
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#endif
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#include <pthread.h>
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pthread_mutex_t test_mutex_initializer = PTHREAD_MUTEX_INITIALIZER;
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int test_mutex (void)
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{
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int x = 0;
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pthread_mutex_t mutex;
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x |= pthread_mutex_init (&mutex, NULL);
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x |= pthread_mutex_lock (&mutex);
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x |= pthread_mutex_unlock (&mutex);
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x |= pthread_mutex_destroy (&mutex);
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return 0;
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}
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int test_mutex_attr (void)
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{
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int x = 0;
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pthread_mutexattr_t attr;
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pthread_mutex_t mutex;
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x |= pthread_mutexattr_init (&attr);
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x |= pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
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x |= pthread_mutex_init (&mutex, &attr);
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x |= pthread_mutex_lock (&mutex);
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x |= pthread_mutex_unlock (&mutex);
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x |= pthread_mutex_destroy (&mutex);
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x |= pthread_mutexattr_destroy (&attr);
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return x;
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}])
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dnl -----------------------------------------------------------------------
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dnl A program to test all the features we want to be able to run the test
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dnl suite or other thready cairo applications that want real threads.
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m4_define([testsuite_pthread_program],[dnl
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libcairo_pthread_program
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pthread_once_t once_control = PTHREAD_ONCE_INIT;
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void test_once_init (void) {}
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int test_once (void)
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{
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return pthread_once (&once_control, test_once_init);
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}
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pthread_key_t test_specific_key;
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int test_specific (void)
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{
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int x = 0;
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x |= pthread_key_create (&test_specific_key, NULL);
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x |= pthread_setspecific (test_specific_key, NULL);
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x |= pthread_getspecific (test_specific_key) != NULL;
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return x;
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}
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void cleaner (void *arg) { (void)arg; }
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void *
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test_thread_main (void *arg)
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{
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pthread_cleanup_push (cleaner, arg);
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pthread_exit (arg);
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pthread_cleanup_pop (1);
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return arg;
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}
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int
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test_threads (void)
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{
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int x = 0;
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pthread_t thread;
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pthread_attr_t attr;
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void *arg = NULL;
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x |= pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
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x |= pthread_create (&thread, &attr, test_thread_main, arg);
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x |= pthread_equal (pthread_self(), thread);
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x |= pthread_join (thread, &arg);
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x |= pthread_attr_destroy (&attr);
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return x;
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}])
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dnl -----------------------------------------------------------------------
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dnl CAIRO_CHECK_PTHREAD(tag, cflags, libs, program, true-action, false-action)
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dnl Set <tag>_{CFLAGS,LIBS} to {<cflags>,<libs>} if we can compile and link
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dnl <program> with the given flags and libs. Execute <true-action> on
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dnl success and <false-action> on failure.
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AC_DEFUN([CAIRO_CHECK_PTHREAD],[dnl
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CAIRO_CC_TRY_LINK_WITH_ENV_SILENT(
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[CFLAGS="$CFLAGS $2";
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LIBS="$LIBS $3"],
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[$4],
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[$1_CFLAGS="$2";
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$1_LIBS="$3";
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$5],
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[$1_CFLAGS="";
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$1_LIBS="";
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$6])
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])
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dnl CAIRO_CONFIGURE_PTHREADS(): Look for pthreads.
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dnl
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dnl If the user specifies PTHREAD_CFLAGS and PTHREAD_LIBS then we use
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dnl those. Otherwise we try CFLAGS=-D_REENTRANT and LIBS=-lpthread for
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dnl full pthread support, and look for stubs in libc for the minimal
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dnl pthread support.
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dnl
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dnl CFLAGS=-D_REENTRANT LIBS=-lpthread has been tested to work on:
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dnl
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dnl Solaris 9 (5.9) Sun C 5.8 Patch 121015-04 2007/01/10
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dnl OpenSolaris (5.11) Sun C 5.9 Patch 124868-08 2008/11/25
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dnl OpenSolaris (5.11) clang version 1.1 (trunk 90017)
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dnl Tru64/OSF1 V5.1 Compaq C V6.5-003
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dnl Mac OS X 10.5.5 gcc 4.0.1 (Apple Inc. build 5465)
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dnl Mac OS X 10.6 gcc 4.2.1 (Apple Inc. build 5659)
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dnl FreeBSD 7.2 gcc 4.2
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dnl OpenBSD 4.5 gcc 3.3.5 (propolice)
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dnl Debian Linux (Etch) gcc 4.3
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dnl
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dnl Thread support is also in various libcs directly, so often using no
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dnl flags at all works as well, but unfortunately Solaris 9 has
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dnl practically _all_ of libpthread stubbed out in libc, so we cannot
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dnl distinguish between a working libpthread and a stubbed out one by a
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dnl link-only test.
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dnl
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dnl We also explicitly do not link to pthread-stubs or whatever other
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dnl third-party stubs library, since that forces cairo clients to be
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dnl extra careful when giving both libcairo and libpthread on the
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dnl command line: the user would have to use "-lpthread -lcairo" rather
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dnl than the more common "-lcairo -lpthread" to not accidentally use
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dnl stubs pulled in by libcairo everywhere in the application. We
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dnl might also need to have a way to teach pkg-config about library
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dnl ordering constraints which aren't actual dependencies, and at this
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dnl point it just starts doing my head in.
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dnl
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dnl If your unix-like doesn't work with the secret handshake
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dnl -D_REENTRANT -lpthread and you can actually compile the rest of
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dnl cairo just fine otherwise, please take a moment complain loudly
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dnl to the cairo mailing list!
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dnl
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AC_DEFUN([CAIRO_CONFIGURE_PTHREAD],[dnl
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dnl Try to use the user's PTHREAD_LIBS/CFLAGS
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dnl if they're available.
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if test "x$PTHREAD_CFLAGS" = "x"; then
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PTHREAD_CFLAGS="-D_REENTRANT"
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fi
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if test "x$PTHREAD_LIBS" = "x"; then
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PTHREAD_LIBS="-lpthread"
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fi
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dnl First try to find the real pthreads.
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CAIRO_CHECK_PTHREAD(
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[real_pthread], [$PTHREAD_CFLAGS], [$PTHREAD_LIBS],
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[testsuite_pthread_program],
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[have_real_pthread=yes],
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[have_real_pthread=no])
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if test "x$have_real_pthread" != "xyes"; then
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dnl Give -pthread a go.
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CAIRO_CHECK_PTHREAD(
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[real_pthread], [-pthread], [],
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[testsuite_pthread_program],
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[have_real_pthread=yes],
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[have_real_pthread="no (can't link with -lpthread or -pthread)"])
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fi
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PTHREAD_CFLAGS=
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PTHREAD_LIBS=
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dnl Check if we can use libc's stubs in libcairo.
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dnl Only do this if the user hasn't explicitly enabled
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dnl pthreads, but is relying on automatic configuration.
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have_pthread="no"
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if test "x$enable_pthread" != "xyes"; then
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CAIRO_CHECK_PTHREAD(
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[pthread], [-D_REENTRANT], [],
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[libcairo_pthread_program],
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[have_pthread=yes],
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[])
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fi
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dnl Default to using the real pthreads for libcairo.
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if test "x$have_pthread" != "xyes"; then
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have_pthread="$have_real_pthread";
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pthread_CFLAGS="$real_pthread_CFLAGS";
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pthread_LIBS="$real_pthread_LIBS";
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fi
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dnl Tell autoconf about the results.
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if test "x$have_real_pthread" = "xyes"; then
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AC_DEFINE([CAIRO_HAS_REAL_PTHREAD], 1,
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[Define to 1 if we have full pthread support])
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fi
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if test "x$have_pthread" = "xyes"; then
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AC_DEFINE([CAIRO_HAS_PTHREAD], 1,
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[Define to 1 f we have minimal pthread support])
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fi
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dnl Make sure we scored some pthreads.
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if test "x$enable_pthread" = "xyes" -a "x$have_pthread" != "xyes"; then
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AC_MSG_ERROR([pthread requested but not found])
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fi
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dnl Set the output variables for CAIRO_ENABLE.
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use_pthread="$have_pthread"
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pthread_REQUIRES=""
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])
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