On Thu, Feb 11, 2010 at 7:40 PM, Dennis Clarke <dclarke@xxxxxxxxxxxxx> wrote:
>
>> It all reminds me a story when I won a bottle of beer from my
>> scientific adviser back in 2005. We had a bet: will gcc compile this
>> code:
>> #include <stdio.h>
>> int main() {
>> printf("a");
>> int a;
>> printf("b");
>> return 0;
>> }
>> He was so sure that gcc won't allow it that didn't ever tried :) Thus,
>> I think gnu extensions by default are not so bad :)
>>
>> Alexey
>
> Let's have a look at that. I don't see any issues really. You call
> printf() with a literal string, then define some simple integer, then
> print another literal string with a call to printf() and finally return
> back to the calling process with a status of 0. Very nice.
>
> $ date
> Thu Feb 11 13:28:17 GMT 2010
> $ uname -a
> SunOS aequitas 5.11 snv_130 i86pc i386 i86pc
> $
> $ cat /etc/release
> Solaris Express Community Edition snv_130 X86
> Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
> Use is subject to license terms.
> Assembled 14 December 2009
> $
> $ /opt/csw/gcc4/bin/gcc --version
> gcc (GCC) 4.3.4
> Copyright (C) 2008 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>
>
> $ ls
> sample1.c
> $
> $ cat -n sample1.c
> 1 /********************************************************************
> 2 From "Alexey Salmin" <alexey.salmin@xxxxxxxxx> email message
> 3 posted to gcc-help@xxxxxxxxxxx Thu, February 11, 2010 04:43
> 4 Subject Re: Why is gcc going to default to "GNU dialect of ISO C99?"
> 5
> *********************************************************************/
> 6 #include <stdio.h>
> 7 int main() {
> 8 printf("a");
> 9 int a;
> 10 printf("b");
> 11 return 0;
> 12 }
> $
>
> $ /opt/csw/gcc4/bin/gcc -v -std=iso9899:1990 -c -o sample1.o sample1.c
> Using built-in specs.
> Target: i386-pc-solaris2.10
> Configured with: /export/medusa/dclarke/build/GCC/gcc-4.3.4/configure
> --build=i386-pc-solaris2.10 --with-gnu-as --with-as=/opt/csw/bin/gas
> --without-gnu-ld --with-ld=/usr/ccs/bin/ld --with-cpu-32=i386
> --with-cpu-64=opteron --with-arch-32=i386 --with-arch-64=opteron
> --enable-stage1-languages=c --enable-nls --with-libiconv-prefix=/opt/csw
> --enable-threads=posix --prefix=/opt/csw/gcc4 --with-local-prefix=/opt/csw
> --enable-shared --enable-multilib --with-included-gettext
> --with-system-zlib --with-gmp=/opt/csw --with-mpfr=/opt/csw
> --enable-languages=c,c++,objc,fortran --enable-bootstrap
> Thread model: posix
> gcc version 4.3.4 (GCC)
> COLLECT_GCC_OPTIONS='-v' '-std=iso9899:1990' '-c' '-o' 'sample1.o'
> '-mtune=generic'
> /opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/cc1 -quiet -v
> sample1.c -quiet -dumpbase sample1.c -mtune=generic -auxbase-strip
> sample1.o -std=iso9899:1990 -version -o /var/tmp//ccGRlbZX.s
> ignoring nonexistent directory
> "/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/../../../../i386-pc-solaris2.10/include"
> #include "..." search starts here:
> #include <...> search starts here:
> /opt/csw/include
> /opt/csw/gcc4/include
> /opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/include
> /opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/include-fixed
> /usr/include
> End of search list.
> GNU C (GCC) version 4.3.4 (i386-pc-solaris2.10)
> compiled by GNU C version 4.3.4, GMP version 4.3.1, MPFR version
> 2.4.2-rc1.
> warning: MPFR header version 2.4.2-rc1 differs from library version 2.4.2.
> GGC heuristics: --param ggc-min-expand=95 --param ggc-min-heapsize=122687
> Compiler executable checksum: 9ba7f205b9cefa6eae48c8f511c89b44
> COLLECT_GCC_OPTIONS='-v' '-std=iso9899:1990' '-c' '-o' 'sample1.o'
> '-mtune=generic'
> /opt/csw/bin/gas -v -V -Qy -s -o sample1.o /var/tmp//ccGRlbZX.s
> GNU assembler version 2.19.1 (i386-pc-solaris2.8) using BFD version (GNU
> Binutils) 2.19.1
> COMPILER_PATH=/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/:/usr/ccs/bin/
> LIBRARY_PATH=/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/../../../:/lib/:/usr/lib/
> COLLECT_GCC_OPTIONS='-v' '-std=iso9899:1990' '-c' '-o' 'sample1.o'
> '-mtune=generic'
> $
> $ ls -lap
> total 8
> drwxr-xr-x 2 dclarke csw 512 Feb 11 13:29 ./
> drwxr-xr-x 3 dclarke csw 512 Feb 11 13:23 ../
> -rw-r--r-- 1 dclarke csw 420 Feb 11 13:28 sample1.c
> -rw-r--r-- 1 dclarke csw 712 Feb 11 13:29 sample1.o
> $ /opt/csw/gcc4/bin/gcc -v -std=iso9899:1990 -o sample1 sample1.o
> Using built-in specs.
> Target: i386-pc-solaris2.10
> Configured with: /export/medusa/dclarke/build/GCC/gcc-4.3.4/configure
> --build=i386-pc-solaris2.10 --with-gnu-as --with-as=/opt/csw/bin/gas
> --without-gnu-ld --with-ld=/usr/ccs/bin/ld --with-cpu-32=i386
> --with-cpu-64=opteron --with-arch-32=i386 --with-arch-64=opteron
> --enable-stage1-languages=c --enable-nls --with-libiconv-prefix=/opt/csw
> --enable-threads=posix --prefix=/opt/csw/gcc4 --with-local-prefix=/opt/csw
> --enable-shared --enable-multilib --with-included-gettext
> --with-system-zlib --with-gmp=/opt/csw --with-mpfr=/opt/csw
> --enable-languages=c,c++,objc,fortran --enable-bootstrap
> Thread model: posix
> gcc version 4.3.4 (GCC)
> COMPILER_PATH=/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/:/usr/ccs/bin/
> LIBRARY_PATH=/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/:/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/../../../:/lib/:/usr/lib/
> COLLECT_GCC_OPTIONS='-v' '-std=iso9899:1990' '-o' 'sample1' '-mtune=generic'
> /opt/csw/gcc4/libexec/gcc/i386-pc-solaris2.10/4.3.4/collect2 -V -Y
> P,/usr/ccs/lib:/usr/lib -Qy -o sample1 /usr/lib/crt1.o /usr/lib/crti.o
> /usr/lib/values-Xa.o
> /opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/crtbegin.o
> -L/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4
> -L/opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/../../.. sample1.o
> -lgcc -lgcc_eh -lc -lgcc -lgcc_eh
> /opt/csw/gcc4/lib/gcc/i386-pc-solaris2.10/4.3.4/crtend.o /usr/lib/crtn.o
> ld: Software Generation Utilities - Solaris Link Editors: 5.11-1.1688
> $
> $ ls -lap
> total 24
> drwxr-xr-x 2 dclarke csw 512 Feb 11 13:30 ./
> drwxr-xr-x 3 dclarke csw 512 Feb 11 13:23 ../
> -rwxr-xr-x 1 dclarke csw 8096 Feb 11 13:30 sample1
> -rw-r--r-- 1 dclarke csw 420 Feb 11 13:28 sample1.c
> -rw-r--r-- 1 dclarke csw 712 Feb 11 13:29 sample1.o
> $
> $ elfdump -d sample1
>
> Dynamic Section: .dynamic
> index tag value
> [0] NEEDED 0x1e8 libc.so.1
> [1] INIT 0x8050d20
> [2] FINI 0x8050d40
> [3] HASH 0x8050144
> [4] STRTAB 0x80504f4
> [5] STRSZ 0x40e
> [6] SYMTAB 0x8050304
> [7] SYMENT 0x10
> [8] SUNW_SYMTAB 0x8050244
> [9] SUNW_SYMSZ 0x2b0
> [10] SUNW_SORTENT 0x4
> [11] SUNW_SYMSORT 0x8050974
> [12] SUNW_SYMSORTSZ 0x3c
> [13] CHECKSUM 0x6176
> [14] VERNEED 0x8050904
> [15] VERNEEDNUM 0x1
> [16] PLTRELSZ 0x40
> [17] PLTREL 0x11
> [18] JMPREL 0x80509d8
> [19] REL 0x80509b0
> [20] RELSZ 0x68
> [21] RELENT 0x8
> [22] DEBUG 0
> [23] FEATURE_1 0x1 [ PARINIT ]
> [24] SUNW_CAP 0x8050128
> [25] FLAGS 0 0
> [26] FLAGS_1 0 0
> [27] SUNW_STRPAD 0x200
> [28] SUNW_LDMACH 0x3 EM_386
> [29] PLTGOT 0x8060d5c
> [30-40] NULL 0
> $
> $ ./sample1
> ab$
> $
> $ ./sample1 | od -Ax -t x1
> 0000000 61 62
> 0000002
> $
>
> No problem there at all.
>
> Let's try the same thing with Sun Studio 12 on Solaris 10 :
>
> $ uname -a
> SunOS vanth 5.10 Generic_142901-03 i86pc i386 i86pc
> $ cat /etc/release
> Solaris 10 5/09 s10x_u7wos_08 X86
> Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
> Use is subject to license terms.
> Assembled 30 March 2009
> $
> $ which cc
> /opt/studio/SOS12/SUNWspro/bin/cc
> $
> $ cc -V
> cc: Sun C 5.9 SunOS_i386 Patch 124868-11 2009/11/21
> usage: cc [ options] files. Use 'cc -flags' for details
> $
> $ ls
> sample1.c
> $
> $ cc -\# -H -Qy -Xc -xbuiltin=%none -Kpic -xildoff -xregs=no%frameptr -xs
> -xstrconst -g -D_TS_ERRNO -D_POSIX_SOURCE -c -o sample1.o sample1.c
> ### Note: NLSPATH =
> /opt/studio/SOS12/SUNWspro/prod/bin/../lib/locale/%L/LC_MESSAGES/%N.cat:/opt/studio/SOS12/SUNWspro/prod/bin/../../lib/locale/%L/LC_MESSAGES/%N.cat
> ### command line files and options (expanded):
> ### -c -D_TS_ERRNO -D_POSIX_SOURCE -g -H -Kpic -Xc -features=no%typeof
> -xregs=no%frameptr -xs -xstrconst sample1.c -o sample1.o
> /opt/studio/SOS12/SUNWspro/prod/bin/acomp -dg -xldscope=global -i
> sample1.c -y-fbe -y/opt/studio/SOS12/SUNWspro/prod/bin/fbe -y-pic
> -y-xarch=generic -y-g -y-o -ysample1.o -y-verbose -y-xthreadvar=dynamic
> -y-comdat -xdbggen=no%stabs+dwarf2+usedonly -H -strconst -D_TS_ERRNO
> -D_POSIX_SOURCE -xdbggen=incl -y-s -2k -m32 -fparam_ir -Qy -D__SunOS_5_10
> -D__SUNPRO_C=0x590 -D__SVR4 -D__sun -D__SunOS -D__unix -D__i386
> -D__BUILTIN_VA_ARG_INCR -D__C99FEATURES__ -Xc -D__PRAGMA_REDEFINE_EXTNAME
> -xc99=%all,no%lib -D__FLT_EVAL_METHOD__=-1 -features=no%typeof
> -I/opt/studio/SOS12/SUNWspro/prod/include/cc
> "-g/opt/studio/SOS12/SUNWspro/prod/bin/cc -H -Qy -Xc -xbuiltin=%none -Kpic
> -xildoff -xregs=no%frameptr -xs -xstrconst -g -D_TS_ERRNO -D_POSIX_SOURCE
> -c -o sample1.o " -fsimple=0 -D__SUN_PREFETCH -destination_ir=yabe
> /usr/include/stdio.h
> /usr/include/sys/feature_tests.h
> /usr/include/sys/ccompile.h
> /usr/include/sys/isa_defs.h
> /usr/include/iso/stdio_iso.h
> /usr/include/sys/va_list.h
> /usr/include/stdio_tag.h
> /usr/include/stdio_impl.h
> /usr/include/iso/stdio_c99.h
> /opt/studio/SOS12/SUNWspro/prod/bin/fbe -s -o sample1.o -warn=%none -Qy
> /tmp/yabeAAARnaqit
> rm /tmp/yabeAAARnaqit
> $
> $ ls -l
> total 3
> -rw-r--r-- 1 dclarke csw 420 Feb 11 13:35 sample1.c
> -rw-r--r-- 1 dclarke csw 3888 Feb 11 13:37 sample1.o
> $
> $ cc -\# -H -Qy -Xc -xbuiltin=%none -Kpic -xildoff -xregs=no%frameptr -xs
> -xstrconst -g -D_TS_ERRNO -D_POSIX_SOURCE -o sample1 sample1.c
> ### Note: NLSPATH =
> /opt/studio/SOS12/SUNWspro/prod/bin/../lib/locale/%L/LC_MESSAGES/%N.cat:/opt/studio/SOS12/SUNWspro/prod/bin/../../lib/locale/%L/LC_MESSAGES/%N.cat
> ### command line files and options (expanded):
> ### -D_TS_ERRNO -D_POSIX_SOURCE -g -H -Kpic -Xc -features=no%typeof
> -xregs=no%frameptr -xs -xstrconst sample1.c -o sample1
> /opt/studio/SOS12/SUNWspro/prod/bin/acomp -dg -xldscope=global -i
> sample1.c -y-fbe -y/opt/studio/SOS12/SUNWspro/prod/bin/fbe -y-pic
> -y-xarch=generic -y-g -y-o -ysample1.o -y-verbose -y-xthreadvar=dynamic
> -y-comdat -xdbggen=no%stabs+dwarf2+usedonly -H -strconst -D_TS_ERRNO
> -D_POSIX_SOURCE -xdbggen=incl -y-s -2k -m32 -fparam_ir -Qy -D__SunOS_5_10
> -D__SUNPRO_C=0x590 -D__SVR4 -D__sun -D__SunOS -D__unix -D__i386
> -D__BUILTIN_VA_ARG_INCR -D__C99FEATURES__ -Xc -D__PRAGMA_REDEFINE_EXTNAME
> -xc99=%all,no%lib -D__FLT_EVAL_METHOD__=-1 -features=no%typeof
> -I/opt/studio/SOS12/SUNWspro/prod/include/cc
> "-g/opt/studio/SOS12/SUNWspro/prod/bin/cc -H -Qy -Xc -xbuiltin=%none -Kpic
> -xildoff -xregs=no%frameptr -xs -xstrconst -g -D_TS_ERRNO -D_POSIX_SOURCE
> -c " -fsimple=0 -D__SUN_PREFETCH -destination_ir=yabe
> /usr/include/stdio.h
> /usr/include/sys/feature_tests.h
> /usr/include/sys/ccompile.h
> /usr/include/sys/isa_defs.h
> /usr/include/iso/stdio_iso.h
> /usr/include/sys/va_list.h
> /usr/include/stdio_tag.h
> /usr/include/stdio_impl.h
> /usr/include/iso/stdio_c99.h
> /opt/studio/SOS12/SUNWspro/prod/bin/fbe -s -o sample1.o -warn=%none -Qy
> /tmp/yabeAAA_BaWit
> rm /tmp/yabeAAA_BaWit
> ### Note: LD_LIBRARY_PATH = <null>
> ### Note: LD_RUN_PATH = <null>
> /usr/ccs/bin/ld /opt/studio/SOS12/SUNWspro/prod/lib/crti.o
> /opt/studio/SOS12/SUNWspro/prod/lib/crt1.o
> /opt/studio/SOS12/SUNWspro/prod/lib/values-xc.o -o sample1 sample1.o -Y
> "P,/opt/studio/SOS12/SUNWspro/prod/lib:/usr/ccs/lib:/lib:/usr/lib" -Qy -lc
> /opt/studio/SOS12/SUNWspro/prod/lib/crtn.o
> $
> $ ls -l
> total 3
> -rwxr-xr-x 1 dclarke csw 7520 Feb 11 13:37 sample1
> -rw-r--r-- 1 dclarke csw 420 Feb 11 13:35 sample1.c
> $
> $ file sample1
> sample1: ELF 32-bit LSB executable 80386 Version 1 [FPU], dynamically
> linked, not stripped
> $
> $ elfdump -d sample1
>
> Dynamic Section: .dynamic
> index tag value
> [0] NEEDED 0x114 libc.so.1
> [1] INIT 0x8050738
> [2] FINI 0x8050754
> [3] RUNPATH 0x13a /opt/csw/lib/amd64
> [4] RPATH 0x13a /opt/csw/lib/amd64
> [5] HASH 0x8050118
> [6] STRTAB 0x805039c
> [7] STRSZ 0x14d
> [8] SYMTAB 0x80501fc
> [9] SYMENT 0x10
> [10] CHECKSUM 0x7ef0
> [11] VERNEED 0x80504ec
> [12] VERNEEDNUM 0x1
> [13] PLTRELSZ 0x30
> [14] PLTREL 0x11
> [15] JMPREL 0x8050524
> [16] REL 0x805051c
> [17] RELSZ 0x38
> [18] RELENT 0x8
> [19] DEBUG 0
> [20] FEATURE_1 0x1 [ PARINIT ]
> [21] SUNW_CAP 0x8050108
> [22] FLAGS 0 0
> [23] FLAGS_1 0 0
> [24] PLTGOT 0x806077c
> [25] NULL 0
> $
> $ ./sample1
> ab$
> $
> $ ./sample1 | od -Ax -t x1
> 0000000 61 62
> 0000002
> $
>
> No problems there either.
>
> --
> Dennis Clarke
> dclarke@xxxxxxxxxxxxxx <- Email related to the open source Solaris
> dclarke@xxxxxxxxxxxxx <- Email related to open source for Solaris
>
>
334 lines of research for 7 lines of code :)
Alexey
