d84123e106
These are HDF5, PNG, FENV, and TUNTAP support, all of which add capabilities to gem5 which can be ignored if not wanted. It could be argued that FENV changes behavior because it makes setting the FP rounding mode work or not as used by SPARC, but since the difference is trivial and in a niche area, that (along with the other options) doesn't seem to justify having a top level control in the build system. Since these are no longer options which say whether to *use* a particular feature, and are instead flags which say whether we *have* a particular feature, change their names from USE_* to HAVE_*, to stay consistent with other variables. Most of the remaining USE_* flags, KVM, FASTMODEL, SYSTEMC, and (indirectly) USE_PYTHON, toggle on and off major systems which can have a significant effect on boot time, or, in the case of FASTMODEL, even consume external resources which may not be available and which may break the build. USE_POSIX_TIMER was also left alone since it selects between two implementations of some functions. By forcing it to be on or off depending on the host, we would be forcing some code to be excluded in either case. That would make that other code impossible to test without hacking up scons or modifying the host machine. Change-Id: I0b03f23e65478caefd50cd3516974386e3dbf0db Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/40964 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com>
38 lines
1.8 KiB
Plaintext
38 lines
1.8 KiB
Plaintext
# Copyright 2020 Google, Inc.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Import('*')
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import gem5_scons
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with gem5_scons.Configure(main) as conf:
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# Check if the TUN/TAP driver is available.
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conf.env['HAVE_TUNTAP'] = conf.CheckHeader('linux/if_tun.h', '<>')
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if not main['HAVE_TUNTAP']:
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print("Info: Compatible header file <linux/if_tun.h> not found.")
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export_vars.append('HAVE_TUNTAP')
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