GCC 4.9.2 does not create an executable, neither a.out or -o hello.exe. Adding -v to the compile line indicates that -o is switched to a non-existent temporary file, for example: -o /tmp/ccr6nMlO.s
Recent installs of Cygwin NT-6.1 over the last few months onto both Windows XP and Windows 7 have all failed to produce an executable. I found Cygwin 1.7.3 on an old laptop that works perfectly.
Have the compile flags or their syntax changed? This command fails to generate an executable:
gcc hello.c -o hello.exe
This is the version I have. I thought it came from a Cygwin mirror. $ uname -a gives
CYGWIN_NT-6.1-WOW Gary-PC 1.7.35(0.287/5/3) 2015-03-04 12:07 i686
Here's a compile example:
$ gcc hello.c -o hello.exe
echo $? returns a 1, without comment. So the compiler is failing.
All attempts to compile any code fails to produce anything in the current directory and no errors or warnings are reported. ctgcheck -c bash binutils bzip2 cygwin gcc-core gcc-g++ gzip m4 make unzip zip indicates everything is installed:
Cygwin Package Information
Package Version Status
bash 4.3.33-1 OK
binutils 2.25-1 OK
bzip2 1.0.6-2 OK
cygwin 1.7.35-1 OK
gcc-core 4.9.2-3 OK
gcc-g++ 4.9.2-3 OK
gzip 1.6-1 OK
m4 1.4.17-1 OK
make 4.1-1 OK
unzip 6.0-14 OK
Compiling with -v gives this report:
$ gcc hello.c -o hello.exe -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-pc-cygwin/4.9.2/lto-wrapper.exe
Target: i686-pc-cygwin
Configured with: /cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-3.i686/src/gcc-4.9.2/configure --srcdir=/cygdrive/i/szsz/tmpp/gcc/gcc-4.9.2-3.i686/src/gcc-4.9.2 --prefix=/usr --exec-prefix=/usr --bindir=/usr/bin --sbindir=/usr/sbin --libexecdir=/usr/libexec --datadir=/usr/share --localstatedir=/var --sysconfdir=/etc --libdir=/usr/lib --datarootdir=/usr/share --docdir=/usr/share/doc/gcc --htmldir=/usr/share/doc/gcc/html -C --build=i686-pc-cygwin --host=i686-pc-cygwin --target=i686-pc-cygwin --without-libiconv-prefix --without-libintl-prefix --libexecdir=/usr/lib --enable-shared --enable-shared-libgcc --enable-static --enable-version-specific-runtime-libs --enable-bootstrap --enable-__cxa_atexit --with-dwarf2 --with-arch=i686 --with-tune=generic --disable-sjlj-exceptions --enable-languages=ada,c,c++,fortran,java,lto,objc,obj-c++ --enable-graphite --enable-threads=posix --enable-libatomic --enable-libgomp --disable-libitm --enable-libquadmath --enable-libquadmath-support --enable-libssp --enable-libada --enable-libjava --enable-libgcj-sublibs --disable-java-awt --disable-symvers --with-ecj-jar=/usr/share/java/ecj.jar --with-gnu-ld --with-gnu-as --with-cloog-include=/usr/include/cloog-isl --without-libiconv-prefix --without-libintl-prefix --with-system-zlib --enable-linker-build-id
Thread model: posix gcc version 4.9.2 (GCC)
COLLECT_GCC_OPTIONS='-o''hello.exe''-v''-mtune=generic''-march=i686' /usr/lib/gcc/i686-pc-cygwin/4.9.2/cc1.exe -quiet -v -Dunix -idirafter /usr/lib/gcc/i686-pc-cygwin/4.9.2/../../../../include/w32api -idirafter /usr/lib/gcc/i686-pc-cygwin/4.9.2/../../../../i686-pc-cygwin/lib/../../include/w32api hello.c -quiet -dumpbase hello.c -mtune=generic -march=i686 -auxbase hello -version -o /tmp/cc8W4cOy.s
I've also installed Cygwin on Windows XP that reports this version: CYGWIN_NT-5.1 lt-love6 1.7.35(0.287/5/3) 2015-03-04 12:07 i686 Cygwin
The compile results for hello.c are the same. No executable is made and $?=1 indicating the compile has failed. Also there are no reported errors or warnings. Using -v provides a report similar to the one above.