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On Sat, May 13, 2017 at 10:21:19AM +0200, Helmut Jarausch wrote |
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> |
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> I have switched to gcc-6.3.0 at the end of last year. |
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> I have (re-)compiled all my packages including icewm-1.3.12-r1. |
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> Everything works just fine. |
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> |
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> I did have some segfaults (with gimp) until I recompiled each package |
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> with gcc-6.3.0 |
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> |
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> I have |
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> CFLAGS="-mtune=native -O2 -msse3 -pipe -fPIC" |
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> |
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> in /etc/portage/make.conf |
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Why aren't you running "-march=native"? You're probably missing quite |
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a few features of your cpu. BTW, "-march=native" implies "-mtune=native" |
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and "-msse3" (if the cpu supports it). Out of sheer curiousity, what |
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does gcc report as your native cpu when you run... |
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|
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gcc -c -Q -march=native --help=target | grep march= |
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> and quite a e few |
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> CFLAGS="-O3 -mtune=native -pipe -msse -msse2 -msse3 -msse4a -m3dnow" |
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> (for my aged AMD64 Phenom II machine) |
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> |
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> in /etc/portage/env/... |
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"-O3"... yikes! Not really recommended. If you want speedup, use |
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"-march=native" instead. |
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In make.conf, I have... |
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CFLAGS="-O2 -march=native -mfpmath=sse -fomit-frame-pointer -pipe -fno-unwind-tables -fno-asynchronous-unwind-tables" |
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The 2 "unwind_tables" flags reduce code bloat. See |
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http://comments.gmane.org/gmane.linux.busybox/36695 for details. The |
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guys at busybox do what they can to reduce code bloat. Knocking 15% off |
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the size of an executable or library helps. This results in faster |
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loading at startup (less to load), and less stuff in ram cuts down on |
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swapping. |
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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I don't run "desktop environments"; I run useful applications |
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