[LLVMdev] Compiling FreeType 2.1.9 with LLVM 1.4
Adam Warner
lists at consulting.net.nz
Sun Dec 19 20:20:43 PST 2004
Hi all,
I learned of LLVM a couple of days ago:
<http://groups.google.co.nz/groups?selm=pan.2004.12.18.11.29.33.33249%40consulting.net.nz>
<http://groups.google.co.nz/groups?th=608e6e38e496f09d>
(I posted a tail call followup which is missing from the archive)
Jestingly, LLVM developers appear intent upon nothing short of world
domination. Not only have you done an end run around exposing the back end
of the GNU Compiler Collection but you are positioning yourselves to
dominate popular virtual machines architectures (such as the JVM from Sun
and the CLR from Microsoft) by translating their classes to LLVM bytecode.
Suffice to say you know what you're doing and it's currently a well kept
secret ;-)
I suspect GCC may be entering a period of twilight that cannot be solved
by forking (unlike occurred in 1997 with EGCS). The world is waking up to
what Lisp developers have been doing for decades: run time code generation
and compilation. The potentially onerous legal restrictions upon using GCC
as a run time and/or JIT compiler can not be solved by forking. GCC may
remain a static compiler and may increasingly become a legacy component of
build systems.
Putting these long term predictions aside, I have modest goals. I'm
learning C and I want to build portable libraries. LLVM's modification of
GCC so it outputs portable LLVM bytecode is ideal. I'd like to build
FreeType 2 as an LLVM library instead of an ordinary shared object (then
I can link my bytecode and the FreeType 2 library together).
I've built llvm-1.4.tar.gz using the cfrontend-1.4.i686-redhat-linux-gnu.tar.gz
binaries. As I didn't appreciate the registration front end I just googled for
the file names.
My new environment is:
export LLVM_LIB_SEARCH_PATH=/home/adam/t/llvm/cfrontend/x86/llvm-gcc/bytecode-libs
export PATH=/home/adam/t/llvm/Release/bin/:/home/adam/t/llvm/cfrontend/x86/llvm-gcc/bin/:$PATH
export CC=/home/adam/t/llvm/cfrontend/x86/llvm-gcc/bin/gcc
export CCC=/home/adam/t/llvm/cfrontend/x86/llvm-gcc/bin/g++
Here's what occurs when building FreeType 2 with LLVM:
1. Download FreeType 2.1.9:
<http://sourceforge.net/project/showfiles.php?group_id=3157>
2. Open Bash shell and set environment variables above. gcc -v is now:
Reading specs from /home/adam/t/llvm/cfrontend/x86/llvm-gcc/bin/../lib/gcc/i686-pc-linux-gnu/3.4-llvm/specs
Configured with: /home/vadve/criswell/release/llvm-gcc/configure
--prefix=/mounts/choi/disks/0/localhome/criswell/rel14/cfrontend/x86/llvm-gcc
--disable-threads --disable-nls --disable-shared --enable-languages=c,c++
Thread model: single
gcc version 3.4-llvm 20030924 (experimental)
3. tar -jxvf freetype-2.1.9.tar.bz2
4. cd freetype-2.1.9
5. edit builds/unix/configure to match GCC's build flags:
if test "x$CC" = xgcc; then
XX_CFLAGS="-Wall"
XX_ANSIFLAGS="-pedantic -ansi"
else
case "$host" in
*-dec-osf*)
CFLAGS=
XX_CFLAGS="-std1 -g3"
XX_ANSIFLAGS=
;;
*)
XX_CFLAGS=
XX_ANSIFLAGS=
;;
esac
fi
becomes:
XX_CFLAGS="-Wall"
XX_ANSIFLAGS="-pedantic -ansi"
5. ./configure
6. make
Building dies part way through with these messages:
/home/adam/t/llvm/cfrontend/x86/llvm-gcc/bin/gcc -pedantic -ansi -I/home/adam/t/freetype-2.1.9/objs -I./builds/unix -I/home/adam/t/freetype-2.1.9/include -c -Wall -g -O2 -DFT_CONFIG_OPTION_SYSTEM_ZLIB -DDARWIN_NO_CARBON "-DFT_CONFIG_CONFIG_H=<ftconfig.h>" -I/home/adam/t/freetype-2.1.9/src/sfnt /home/adam/t/freetype-2.1.9/src/sfnt/sfnt.c -o /home/adam/t/freetype-2.1.9/objs/sfnt.o
In file included from /home/adam/t/freetype-2.1.9/src/sfnt/sfnt.c:22:
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c: In function `tt_face_load_generic_header':
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:597: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:597: error: (near initialization for `header_fields[7].offset')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:597: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:597: error: (near initialization for `header_fields[7]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:598: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:598: error: (near initialization for `header_fields[8].offset')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:598: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:598: error: (near initialization for `header_fields[8]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:599: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:599: error: (near initialization for `header_fields[9].offset')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:599: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:599: error: (near initialization for `header_fields[9]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:600: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:600: error: (near initialization for `header_fields[10].offset')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:600: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:600: error: (near initialization for `header_fields[10]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:601: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:601: error: (near initialization for `header_fields[11]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:602: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:602: error: (near initialization for `header_fields[12]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:603: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:603: error: (near initialization for `header_fields[13]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:604: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:604: error: (near initialization for `header_fields[14]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:605: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:605: error: (near initialization for `header_fields[15]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:606: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:606: error: (near initialization for `header_fields[16]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:607: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:607: error: (near initialization for `header_fields[17]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:608: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:608: error: (near initialization for `header_fields[18]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:609: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:609: error: (near initialization for `header_fields[19]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:610: error: initializer element is not constant
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:610: error: (near initialization for `header_fields[20]')
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c: In function `tt_face_load_metrics_header':
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:986: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:986: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:987: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:987: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:988: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:988: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:989: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:989: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c: In function `tt_face_load_os2':
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1319: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1319: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1320: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1320: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1321: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1321: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1322: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1322: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1323: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1323: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1324: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1324: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1325: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1325: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1326: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1326: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1327: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1327: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1328: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1328: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1333: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1333: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1334: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1334: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1335: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1335: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1336: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttload.c:1336: warning: initializer element is not computable at load time
In file included from /home/adam/t/freetype-2.1.9/src/sfnt/sfnt.c:28:
/home/adam/t/freetype-2.1.9/src/sfnt/ttsbit.c: In function `tt_face_load_sbit_strikes':
/home/adam/t/freetype-2.1.9/src/sfnt/ttsbit.c:421: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttsbit.c:421: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttsbit.c:422: warning: initializer element is not computable at load time
/home/adam/t/freetype-2.1.9/src/sfnt/ttsbit.c:422: warning: initializer element is not computable at load time
make: *** [/home/adam/t/freetype-2.1.9/objs/sfnt.lo] Error 1
Note that when using standard GCC FreeType builds fine:
Reading specs from /usr/lib/gcc-lib/i486-linux/3.3.5/specs
Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,
objc,ada,treelang --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib
--enable-nls --without-included-gettext --enable-__cxa_atexit
--enable-clocale=gnu --enable-debug --enable-java-gc=boehm --enable-java-awt=xlib
--enable-objc-gc i486-linux
Thread model: posix
gcc version 3.3.5 (Debian 1:3.3.5-4)
Many thanks for any build tips. My operating system is Debian GNU/Linux sid/unstable.
If this is too experimental to be expected to work I'll learn how LLVM bc can be
linked with C shared objects instead. I'm currently to the point where I can execute
my own bytecode via lli (or compile it via llc) and produce this output:
$ lli a.out.bc
ERROR: Program used external function 'FT_Init_FreeType' which could not be resolved!
lli((anonymous namespace)::PrintStackTrace()+0x1f)[0x835875f]
/lib/tls/libc.so.6(abort+0x1d2)[0x40135f12]
lli[0x810666b]
Aborted
[This is expected, of course, as I'm attempting to get to the point of linking]
Many thanks,
Adam
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