[Bug bootstrap/55163] New: Ongoing problem with gengtype-lex.c under CygWin with CRLF text mode line endings since 4.8

[nico at josuttis dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55163

             Bug #: 55163
           Summary: Ongoing problem with gengtype-lex.c under CygWin with
                    CRLF text mode line endings since 4.8
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: nico@josuttis.de


For all versions of 4.8.0 I tried to compile, I run into the same problem
when building a C++ compiler in my CygWin environment.

The error is as follows:
========================
flex  -ogengtype-lex.c ../../src/gcc/gengtype-lex.l && { \
  echo '#include "bconfig.h"' > gengtype-lex.c.tmp; \
  cat gengtype-lex.c >> gengtype-lex.c.tmp; \
  mv gengtype-lex.c.tmp gengtype-lex.c; \
}
g++ -c   -g -O2 -DIN_GCC    -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wwrite-strings -Wcast-qual
-Wmissing-format-attribute -fno-common -Wno-error -DHAVE_CONFIG_H
-DGENERATOR_FILE -I. -Ibuild -I../../src/gcc -I../../src/gcc/build 
-I../../src/gcc/../include   -I../../src/gcc/../libcpp/include
-I/cygdrive/p/gcc/gcc-trunk-install/build/./gmp
-I/cygdrive/p/gcc/gcc-trunk-install/src/gmp
-I/cygdrive/p/gcc/gcc-trunk-install/build/./mpfr
-I/cygdrive/p/gcc/gcc-trunk-install/src/mpfr
-I/cygdrive/p/gcc/gcc-trunk-install/src/mpc/src 
-I../../src/gcc/../libdecnumber -I../../src/gcc/../libdecnumber/bid
-I../libdecnumber -I../../src/gcc/../libbacktrace     \
    -o build/gengtype-lex.o gengtype-lex.c
gengtype-lex.c:332: error: expected unqualified-id before "do"
gengtype-lex.c:332: error: expected `,' or `;' before "do"
gengtype-lex.c:352: error: expected unqualified-id before "while"
gengtype-lex.c:352: error: expected `,' or `;' before "while"
gengtype-lex.c:394: error: `yy_size_t' does not name a type
gengtype-lex.c:524: error: expected unqualified-id before '?' token
...

It seems that there is a CR/LF problem because I can fix it by
running
 /usr/bin/sed -e 's/^M$//' 
on the generated gengtype-lex.c and then continue with the build.

It looks like my CygWin settings let gengtype-lex.c get created with
some CR/LF combinations, which the compiler is then not able to handle.
This is probably caused by having DOS/text default file system type:
 $ mount -m
 none /cygdrive cygdrive text,posix=0,user 0 0

However, as I might not be the only one having text mode (with CRLF generated)
as default, we should better fix this problem.

Note that with gcc 4.7.x this problem does not exist, so this problem is new
with 4.8.