571,572c571,574
< # Check for a supported version of gcc, >= 4.4 is needed for c++0x
< # support. See http://gcc.gnu.org/projects/cxx0x.html for details
---
> # Check for a supported version of gcc. >= 4.6 is chosen for its
> # level of c++11 support. See
> # http://gcc.gnu.org/projects/cxx0x.html for details. 4.6 is also
> # the first version with proper LTO support.
574,575c576,577
< if compareVersions(gcc_version, "4.4") < 0:
< print 'Error: gcc version 4.4 or newer required.'
---
> if compareVersions(gcc_version, "4.6") < 0:
> print 'Error: gcc version 4.6 or newer required.'
581,585c583,590
< # Check for versions with bugs
< if not compareVersions(gcc_version, '4.4.1') or \
< not compareVersions(gcc_version, '4.4.2'):
< print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
< main.Append(CCFLAGS=['-fno-tree-vectorize'])
---
> # Add the appropriate Link-Time Optimization (LTO) flags
> # unless LTO is explicitly turned off. Note that these flags
> # are only used by the fast target.
> if not GetOption('no_lto'):
> # Pass the LTO flag when compiling to produce GIMPLE
> # output, we merely create the flags here and only append
> # them later/
> main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
587,596c592,596
< # LTO support is only really working properly from 4.6 and beyond
< if compareVersions(gcc_version, '4.6') >= 0:
< # Add the appropriate Link-Time Optimization (LTO) flags
< # unless LTO is explicitly turned off. Note that these flags
< # are only used by the fast target.
< if not GetOption('no_lto'):
< # Pass the LTO flag when compiling to produce GIMPLE
< # output, we merely create the flags here and only append
< # them later/
< main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
---
> # Use the same amount of jobs for LTO as we are running
> # scons with, we hardcode the use of the linker plugin
> # which requires either gold or GNU ld >= 2.21
> main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
> '-fuse-linker-plugin']
598,603d597
< # Use the same amount of jobs for LTO as we are running
< # scons with, we hardcode the use of the linker plugin
< # which requires either gold or GNU ld >= 2.21
< main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
< '-fuse-linker-plugin']
<
608,609c602,603
< # Check for a supported version of clang, >= 2.9 is needed to
< # support similar features as gcc 4.4. See
---
> # Check for a supported version of clang, >= 3.0 is needed to
> # support similar features as gcc 4.6. See
615,616c609,610
< if compareVersions(clang_version, "2.9") < 0:
< print 'Error: clang version 2.9 or newer required.'
---
> if compareVersions(clang_version, "3.0") < 0:
> print 'Error: clang version 3.0 or newer required.'
< # Check for a supported version of gcc, >= 4.4 is needed for c++0x
< # support. See http://gcc.gnu.org/projects/cxx0x.html for details
---
> # Check for a supported version of gcc. >= 4.6 is chosen for its
> # level of c++11 support. See
> # http://gcc.gnu.org/projects/cxx0x.html for details. 4.6 is also
> # the first version with proper LTO support.
574,575c576,577
< if compareVersions(gcc_version, "4.4") < 0:
< print 'Error: gcc version 4.4 or newer required.'
---
> if compareVersions(gcc_version, "4.6") < 0:
> print 'Error: gcc version 4.6 or newer required.'
581,585c583,590
< # Check for versions with bugs
< if not compareVersions(gcc_version, '4.4.1') or \
< not compareVersions(gcc_version, '4.4.2'):
< print 'Info: Tree vectorizer in GCC 4.4.1 & 4.4.2 is buggy, disabling.'
< main.Append(CCFLAGS=['-fno-tree-vectorize'])
---
> # Add the appropriate Link-Time Optimization (LTO) flags
> # unless LTO is explicitly turned off. Note that these flags
> # are only used by the fast target.
> if not GetOption('no_lto'):
> # Pass the LTO flag when compiling to produce GIMPLE
> # output, we merely create the flags here and only append
> # them later/
> main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
587,596c592,596
< # LTO support is only really working properly from 4.6 and beyond
< if compareVersions(gcc_version, '4.6') >= 0:
< # Add the appropriate Link-Time Optimization (LTO) flags
< # unless LTO is explicitly turned off. Note that these flags
< # are only used by the fast target.
< if not GetOption('no_lto'):
< # Pass the LTO flag when compiling to produce GIMPLE
< # output, we merely create the flags here and only append
< # them later/
< main['LTO_CCFLAGS'] = ['-flto=%d' % GetOption('num_jobs')]
---
> # Use the same amount of jobs for LTO as we are running
> # scons with, we hardcode the use of the linker plugin
> # which requires either gold or GNU ld >= 2.21
> main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
> '-fuse-linker-plugin']
598,603d597
< # Use the same amount of jobs for LTO as we are running
< # scons with, we hardcode the use of the linker plugin
< # which requires either gold or GNU ld >= 2.21
< main['LTO_LDFLAGS'] = ['-flto=%d' % GetOption('num_jobs'),
< '-fuse-linker-plugin']
<
608,609c602,603
< # Check for a supported version of clang, >= 2.9 is needed to
< # support similar features as gcc 4.4. See
---
> # Check for a supported version of clang, >= 3.0 is needed to
> # support similar features as gcc 4.6. See
615,616c609,610
< if compareVersions(clang_version, "2.9") < 0:
< print 'Error: clang version 2.9 or newer required.'
---
> if compareVersions(clang_version, "3.0") < 0:
> print 'Error: clang version 3.0 or newer required.'