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bug#9705: 24.0.90; cannot compile GNU Emacs with Apple modified GCC 4.0
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From: |
Peter Dyballa |
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Subject: |
bug#9705: 24.0.90; cannot compile GNU Emacs with Apple modified GCC 4.0 and 4.2 |
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Date: |
Sun, 9 Oct 2011 12:31:14 +0200 |
Am 09.10.2011 um 01:26 schrieb Peter Dyballa:
Both compilers compile OK when used with -O0 and -Os.
They work OK with -O3.
The documentation for both Apple modified compilers describes:
http://developer.apple.com/library/mac/#documentation/DeveloperTools/
gcc-4.2.1/gcc/index.html
http://developer.apple.com/library/mac/#documentation/DeveloperTools/
gcc-4.0.1/gcc/index.html
4.2.1 4.0.1
===== =====
-O turns on the following optimization flags:
-fdefer-pop -fdefer-pop
-fdelayed-branch -fdelayed-branch
-fguess-branch-probability -fguess-branch-probability
-fcprop-registers -fcprop-registers
-floop-optimize
-fif-conversion -fif-conversion
-fif-conversion2 -fif-conversion2
-ftree-ccp -ftree-ccp
-ftree-dce -ftree-dce
-ftree-dominator-opts -ftree-dominator-opts
-ftree-dse -ftree-dse
-ftree-ter -ftree-ter
-ftree-lrs -ftree-lrs
-ftree-sra -ftree-sra
-ftree-copyrename -ftree-copyrename
-ftree-fre -ftree-fre
-ftree-ch -ftree-ch
-fmerge-constants -fmerge-constants
-funit-at-a-time
-O also turns on -fomit-frame-pointer on machines where doing so does
not interfere with debugging.
-O2 turns on all optimization flags specified by -O. It also turns on
the following optimization flags:
-fthread-jumps -fthread-jumps
-fcrossjumping -fcrossjumping
-foptimize-sibling-calls -foptimize-sibling-calls
-fcse-follow-jumps -fcse-follow-jumps
-fcse-skip-blocks -fcse-skip-blocks
-fgcse -fgcse
-fgcse-lm -fgcse-lm
-fexpensive-optimizations -fexpensive-optimizations
-fstrength-reduce
-frerun-cse-after-loop -frerun-cse-after-loop
-frerun-loop-opt
-fcaller-saves -fcaller-saves
-fforce-mem
-fpeephole2 -fpeephole2
-fschedule-insns -fschedule-insns
-fschedule-insns2 -fschedule-insns2
-fsched-interblock -fsched-interblock
-fsched-spec -fsched-spec
-fregmove -fregmove
-fstrict-aliasing -fstrict-aliasing
-fstrict-overflow
-fdelete-null-pointer-checks -fdelete-null-pointer-checks
-freorder-blocks -freorder-blocks
-freorder-functions -freorder-functions
-funit-at-a-time
-falign-functions -falign-functions
-falign-jumps -falign-jumps
-falign-loops -falign-loops
-falign-labels -falign-labels
-ftree-vrp
-ftree-pre -ftree-pre
Please note the warning under -fgcse about invoking -O2 on programs
that use computed gotos.
-O3 turns on all optimizations specified by -O2 and also turns on
-finline-functions -finline-functions
-funswitch-loops -funswitch-loops
-fgcse-after-reload -fgcse-after-reload
-Os enables all -O2 optimizations that do not typically increase code
size. It also performs further optimizations designed to reduce code
size. -Os disables the following optimization flags:
-falign-functions -falign-functions
-falign-jumps -falign-jumps
-falign-loops -falign-loops
-falign-labels -falign-labels
-freorder-blocks -freorder-blocks
-freorder-blocks-and-partition -freorder-blocks-and-partition
-fprefetch-loop-arrays -fprefetch-loop-arrays
-ftree-vect-loop-version
-fast
Optimize for maximum performance. -fast changes the overall
optimization strategy of GCC in order to produce the fastest possible
running code for PPC7450 and G5 architectures. By default, -fast
optimizes for G5. Programs optimized for G5 will not run on PPC7450.
To optimize for PPC7450, add -mcpu=7450 on command line.
-fast currently enables the following optimization flags (for G5 and
PPC7450). These flags may change in the future. You cannot override
any of these options if you use -fast except by setting -mcpu=7450 (or
-fPIC, see below).
-O3 -O3
-falign-loops-max-skip=15 -falign-loops-max-skip=15
-falign-jumps-max-skip=15 -falign-jumps-max-skip=15
-falign-loops=16 -falign-loops=16
-falign-jumps=16 -falign-jumps=16
-falign-functions=16 -falign-functions=16
-malign-natural (except when…) -malign-natural (except when -fastf is
specified)
-ffast-math -ffast-math
-fstrict-aliasing -fstrict-aliasing
-funroll-loops -funroll-loops
-ftree-loop-linear -ftree-loop-linear
-ftree-loop-memset -ftree-loop-memset
-mcpu=G5 -mcpu=G5
-mpowerpc-gpopt -mpowerpc-gpopt
-mtune=G5 (unless -mtune=G4… ) -mtune=G5 (unless -mtune=G4 is
specified).
-fsched-interblock -fsched-interblock
-fgcse-sm -fgcse-sm
-mpowerpc64 -mpowerpc64
To build shared libraries with -fast, specify -fPIC on the command
line as -fast turns on -mdynamic-no-pic otherwise.
Important notes: -ffast-math results in code that is not necessarily
IEEE-compliant. -fstrict-aliasing is highly likely to break non-
standard-compliant programs. -malign-natural only works properly if
the entire program is compiled with it, and none of the standard
headers/libraries contain any code that changes alignment when this
option is used.
On Intel target, -fast currently enables the following optimization
flags:
-O3 -O3
-fomit-frame-pointer -fomit-frame-pointer
-fstrict-aliasing -fstrict-aliasing
-momit-leaf-frame-pointer -momit-leaf-frame-pointer
-fno-tree-pre -fno-tree-pre
-falign-loops -falign-loops
All choices of flags enabled by -fast are subject to change without
notice.
My recent series of tests is with:
env LANG=C PATH=/sw/bin:$PATH ./configure --without-sound --without-
dbus --without-pop --without-gconf --without-gpm --without-gsettings --
without-gif --without-jpeg --without-png --without-rsvg --without-tiff
--without-xpm --with-wide-int --with-x-toolkit=athena --x-libraries=/
usr/X11/lib --x-includes=/usr/X11/include --enable-locallisppath=/
Library/Application\ Support/Emacs/calendar24:/Library/Application\
Support/Emacs
While
LDFLAGS="-Wl,-dead_strip_dylibs -Wl,-bind_at_load -Wl,-t" CC=gcc-4.2
CPP=cpp-4.2 PKG_CONFIG_PATH=/sw/lib/xft2/lib/pkgconfig:/sw/share/
pkgconfig:/sw/lib/pkgconfig:/usr/X11/lib/pkgconfig:/usr/X11/share/
pkgconfig:/usr/lib/pkgconfig
stay unchanged I modify
CFLAGS="-g -H -pipe -fPIC -fno-common -mcpu=7450 -mtune=G4 -maltivec -
faltivec -mabi=altivec -O3 -falign-loops-max-skip=15 -falign-loops=16 -
falign-jumps=16 -falign-functions=16 -ffast-math -fstrict-aliasing -
mfused-madd -mmultiple -ftree-vectorize -mpowerpc-gfxopt"
Now, at high noon, I already found that -malign-natural produces the
failure – the documentation warns about its use!
(I wonder whether the sequence of the flags passed to the compiler
plays a role. I'll also try an additional test à la '-fast -mcpu=7450 -
mtune=G4' or '-fast -mcpu=7450 -mtune=7450' to be sure that non-G4
options are effectively suppressed. -fastf is also an option I should
consider and read again about it.)
--
Greetings
Pete
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