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Add --disable-syscall.

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This resolves #517.
This commit is contained in:
Jason Evans
2016-12-03 16:47:36 -08:00
parent e1b2970d28
commit 145f3cd173
5 changed files with 33 additions and 15 deletions
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31
configure.ac
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@@ -1396,20 +1396,33 @@ if test "x${je_cv_mach_absolute_time}" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_MACH_ABSOLUTE_TIME])
fi
dnl Check if syscall(2) is usable. Treat warnings as errors, so that e.g. OS X
dnl 10.12's deprecation warning prevents use.
SAVED_CFLAGS="${CFLAGS}"
JE_CFLAGS_APPEND([-Werror])
JE_COMPILABLE([syscall(2)], [
dnl Use syscall(2) (if available) by default.
AC_ARG_ENABLE([syscall],
[AS_HELP_STRING([--disable-syscall], [Disable use of syscall(2)])],
[if test "x$enable_syscall" = "xno" ; then
enable_syscall="0"
else
enable_syscall="1"
fi
],
[enable_syscall="1"]
)
if test "x$enable_syscall" = "x1" ; then
dnl Check if syscall(2) is usable. Treat warnings as errors, so that e.g. OS
dnl X 10.12's deprecation warning prevents use.
SAVED_CFLAGS="${CFLAGS}"
JE_CFLAGS_APPEND([-Werror])
JE_COMPILABLE([syscall(2)], [
#include <sys/syscall.h>
#include <unistd.h>
], [
syscall(SYS_write, 2, "hello", 5);
],
[je_cv_syscall])
CFLAGS="${SAVED_CFLAGS}"
if test "x$je_cv_syscall" = "xyes" ; then
AC_DEFINE([JEMALLOC_HAVE_SYSCALL], [ ])
[je_cv_syscall])
CFLAGS="${SAVED_CFLAGS}"
if test "x$je_cv_syscall" = "xyes" ; then
AC_DEFINE([JEMALLOC_USE_SYSCALL], [ ])
fi
fi
dnl Check if the GNU-specific secure_getenv function exists.