The Tor Browser: build/autoconf/linux.m4@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 dnl This Source Code Form is subject to the terms of the Mozilla Public

     2 dnl License, v. 2.0. If a copy of the MPL was not distributed with this

     3 dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.

     5 AC_DEFUN([MOZ_LINUX_PERF_EVENT],

6 [

     8 MOZ_ARG_WITH_STRING(linux-headers,

     9 [  --with-linux-headers=DIR

    10                           location where the Linux kernel headers can be found],

    11     linux_headers=$withval)

    13 LINUX_HEADERS_INCLUDES=

    15 if test "$linux_headers"; then

    16     LINUX_HEADERS_INCLUDES="-I$linux_headers"

    17 fi

    19 _SAVE_CFLAGS="$CFLAGS"

    20 CFLAGS="$CFLAGS $LINUX_HEADERS_INCLUDES"

    22 dnl Performance measurement headers.

    23 MOZ_CHECK_HEADER(linux/perf_event.h,

    24     [AC_CACHE_CHECK(for perf_event_open system call,ac_cv_perf_event_open,

    25         [AC_TRY_COMPILE([#include <asm/unistd.h>],[return sizeof(__NR_perf_event_open);],

    26         ac_cv_perf_event_open=yes,

    27         ac_cv_perf_event_open=no)])])

    28 if test "$ac_cv_perf_event_open" = "yes"; then

    29     HAVE_LINUX_PERF_EVENT_H=1

    30 else

    31     HAVE_LINUX_PERF_EVENT_H=

    32     LINUX_HEADERS_INCLUDES=

    33 fi

    34 AC_SUBST(HAVE_LINUX_PERF_EVENT_H)

    35 AC_SUBST(LINUX_HEADERS_INCLUDES)

    37 CFLAGS="$_SAVE_CFLAGS"

    39 ])

The Tor Browser / file revision