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scons: Reverts LTO for opt, perf and prof builds.

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This reverts
https://gem5-review.googlesource.com/c/public/gem5/+/40815
and adds the `--with-lto` to enable LTO; and removes `--no-lto`.

Change-Id: I7dbd2b555570c90c98f38c7c02eb052571f7b6bd
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44886
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45839
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
This commit is contained in:
Bobby R. Bruce
2021-04-27 11:51:27 -07:00
parent 935819c37b
commit 5b07a0787b
1 changed files with 10 additions and 5 deletions
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15
SConstruct
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@@ -108,8 +108,8 @@ AddOption('--ignore-style', action='store_true',
AddOption('--gold-linker', action='store_true', help='Use the gold linker')
AddOption('--no-compress-debug', action='store_true',
help="Don't compress debug info in build files")
AddOption('--no-lto', action='store_true',
help='Disable Link-Time Optimization for fast')
AddOption('--with-lto', action='store_true',
help='Enable Link-Time Optimization')
AddOption('--verbose', action='store_true',
help='Print full tool command lines')
AddOption('--without-python', action='store_true',
@@ -341,9 +341,9 @@ if main['GCC']:
error('gcc version 5 or newer required.\n'
'Installed version:', main['CXXVERSION'])
# Add the appropriate Link-Time Optimization (LTO) flags
# unless LTO is explicitly turned off.
if not GetOption('no_lto'):
# Add the appropriate Link-Time Optimization (LTO) flags if `--with-lto` is
# set.
if GetOption('with_lto'):
# g++ uses "make" to parallelize LTO. The program can be overriden with
# the environment variable "MAKE", but we currently make no attempt to
# plumb that variable through.
@@ -371,6 +371,11 @@ elif main['CLANG']:
error('clang version 3.9 or newer required.\n'
'Installed version:', main['CXXVERSION'])
# Set the Link-Time Optimization (LTO) flags if enabled.
if GetOption('with_lto'):
for var in 'LTO_CCFLAGS', 'LTO_LDFLAGS':
main[var] = ['-flto']
# clang has a few additional warnings that we disable, extraneous
# parantheses are allowed due to Ruby's printing of the AST,
# finally self assignments are allowed as the generated CPU code