If we start some lines of code by using a #if... or #ifndef
  or #if define "first" line, a line of the sort  #ekse   (that is a typo
  and was meant to read #else) is ignored and all the code up to the
  final #endif is ignored. There should be a syntax warning of the same
  kind as if we start the construct with a #if or #ifndef  that is "true".

Environment:
System: SunOS wminrts 5.8 Generic_108528-11 sun4u sparc SUNW,Ultra-60
Architecture: sun4

host: sparc-sun-solaris2.8
build: sparc-sun-solaris2.8
target: sparc-sun-solaris2.8
Configured with: /diska/home/vltmgr/VLTSW/PRODUCTS/gnu/SunOS-5.8/gcc-3.2.1/configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --enable-shared --enable-languages=c++,f77 --prefix=/vlt/APR2003/gnu

How-To-Repeat:

  Source-code t.c:

int main(int argc, char *argv[])
{
#if 0
   int dummy= 1 ;
#ekse
    int dummy= 0 ;
#endif
    return 0 ;
}


 compiled with

   gcc -save-temps -v -Wall -pedantic -o t t.c

Reading specs from /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/specs
Configured with: /diska/home/vltmgr/VLTSW/PRODUCTS/gnu/SunOS-5.8/gcc-3.2.1/configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --enable-shared --enable-languages=c++,f77 --prefix=/vlt/APR2003/gnu
Thread model: posix
gcc version 3.2.1
 /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/cpp0 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=1 -D__GXX_ABI_VERSION=102 -Dsparc -Dsun -Dunix -D__svr4__ -D__SVR4 -D__PRAGMA_REDEFINE_EXTNAME -D__sparc__ -D__sun__ -D__unix__ -D__svr4__ -D__SVR4 -D__PRAGMA_REDEFINE_EXTNAME -D__sparc -D__sun -D__unix -Asystem=unix -Asystem=svr4 -D__NO_INLINE__ -D__STDC_HOSTED__=1 -D__SIZE_TYPE__=unsigned int -D__PTRDIFF_TYPE__=int -D__WCHAR_TYPE__=long int -D__WINT_TYPE__=long int -D__GCC_NEW_VARARGS__ -Acpu=sparc -Amachine=sparc t.c -Wall -pedantic t.i
GNU CPP version 3.2.1 (cpplib) (sparc ELF)
ignoring nonexistent directory "/vlt/APR2003/gnu/sparc-sun-solaris2.8/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /vlt/APR2003/gnu/include
 /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/include
 /usr/include
End of search list.
 /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/cc1 -fpreprocessed t.i -quiet -dumpbase t.c -Wall -pedantic -version -o t.s
GNU CPP version 3.2.1 (cpplib) (sparc ELF)
GNU C version 3.2.1 (sparc-sun-solaris2.8)
        compiled by GNU C version 3.2.1.
 /usr/ccs/bin/as -V -Qy -s -o t.o t.s
/usr/ccs/bin/as: Sun WorkShop 6 99/08/18
 /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/collect2 -V -Y P,/usr/ccs/lib:/usr/lib -Qy -o t /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/crt1.o /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/crti.o /usr/ccs/lib/values-Xa.o /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/crtbegin.o -L/vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1 -L/vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/../../../../sparc-sun-solaris2.8/lib -L/usr/ccs/bin -L/usr/ccs/lib -L/vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/../../.. t.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh -lc /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/crtend.o /vlt/APR2003/gnu/lib/gcc-lib/sparc-sun-solaris2.8/3.2.1/crtn.o
ld: Software Generation Utilities - Solaris-ELF (4.0)


  preprocessor output:

# 1 "t.c"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "t.c"
int main(int argc, char *argv[])
{





    return 0 ;
}