Mailing-List: contact cygwin-help AT cygwin DOT com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner AT cygwin DOT com Mail-Followup-To: cygwin AT cygwin DOT com Delivered-To: mailing list cygwin AT cygwin DOT com Resent-Message-Id: <200307091556 DOT h69FuHW07756 AT aamail DOT fame DOT com> Resent-Sender: sdowning AT wssfd DOT fame DOT com Resent-To: cygwin AT cygwin DOT com Resent-From: sdowning AT fame DOT com (Stuart F. Downing) Resent-Date: 09 Jul 2003 11:55:01 -0400 X-From-Line: nobody Wed Jul 9 11:53:29 2003 To: cygwin AT cynwin DOT com Subject: Problem including MinGW's float.h From: sdowning AT fame DOT com (Stuart F. Downing) Date: 09 Jul 2003 11:53:25 -0400 Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.1 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Lines: 91 I'm trying to compile code that calls _controlfp which is declared in /usr/include/mingw/float.h, but when I include float.h, gcc doesn't find the mingw float.h first, it finds the gcc header first. Here is the code #include int main() { unsigned int uiFPControl; unsigned int uiFPNewControl; uiFPControl = _controlfp( 0 , 0 ); uiFPControl |= _EM_ZERODIVIDE; uiFPNewControl = _controlfp( uiFPControl , _MCW_EM ); } gcc -v -mno-cygwin -c foo.c produces this... Reading specs from /usr/lib/gcc-lib/i686-pc-mingw32/3.2/specs Configured with: /netrel/src/gcc-3.2-3/configure --enable-languages=c,c++,f77,java --enable-libgcj --enable-threads=posix --with-system-zlib --enable-nls --without-included-gettext --enable-interpreter --disable-sjlj-exceptions --disable-version-specific-runtime-libs --enable-shared --build=i686-pc-linux --host=i686-pc-cygwin --target=i686-pc-cygwin --enable-haifa --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --includedir=/nonexistent/include --libexecdir=/usr/sbin Thread model: posix gcc version 3.2 20020927 (prerelease) /usr/lib/gcc-lib/i686-pc-mingw32/3.2/cc1.exe -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=0 -D__GXX_ABI_VERSION=102 -D_X86_=1 -D_X86_=1 -Asystem=winnt -D__NO_INLINE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i686__ -D__tune_pentiumpro__ -D__tune_pentium2__ -D__tune_pentium3__ -D__stdcall=__attribute__((__stdcall__)) -D__fastcall=__attribute__((__fastcall__)) -D__cdecl=__attribute__((__cdecl__)) -D_stdcall=__attribute__((__stdcall__)) -D_fastcall=__attribute__((__fastcall__)) -D_cdecl=__attribute__((__cdecl__)) -D__declspec(x)=__attribute__((x)) -D__i386__ -D__i386 -D__MSVCRT__ -D__MINGW32__ -DWIN32 -D_WIN32 -D__WIN32 -D__WIN32__ -DWINNT -isystem /usr/lib/gcc-lib/i686-pc-mingw32/3.2/../../../../include/w32api -isystem /usr/lib/gcc-lib/i686-pc-mingw32/3.2/../../../../i686-pc-mingw32/lib/../../include/w32api foo.c -quiet -dumpbase foo.c -mno-cygwin -version -o /cygdrive/c/DOCUME~1/sdowning/LOCALS~1/Temp/cc3uqCbc.s GNU CPP version 3.2 20020927 (prerelease) (cpplib) (80386, BSD syntax) GNU C version 3.2 20020927 (prerelease) (i686-pc-cygwin) compiled by GNU C version 3.2 20020927 (prerelease). ignoring nonexistent directory "/usr/local/include/mingw/mingw" ignoring nonexistent directory "/usr/i686-pc-mingw32/include/usr/include/mingw" ignoring duplicate directory "/usr/i686-pc-mingw32/lib/../../include/w32api" #include "..." search starts here: #include <...> search starts here: /usr/include/w32api /usr/lib/gcc-lib/i686-pc-cygwin/3.2/include /usr/include/mingw End of search list. foo.c: In function `main': foo.c:9: `_EM_ZERODIVIDE' undeclared (first use in this function) foo.c:9: (Each undeclared identifier is reported only once foo.c:9: for each function it appears in.) foo.c:10: `_MCW_EM' undeclared (first use in this function) gcc -E -mno-cygwin foo.c produces # 1 "foo.c" # 1 "" # 1 "" # 1 "foo.c" # 1 "/usr/lib/gcc-lib/i686-pc-cygwin/3.2/include/float.h" 1 3 # 2 "foo.c" 2 int main() { unsigned int uiFPControl; unsigned int uiFPNewControl; uiFPControl = _controlfp( 0 , 0 ); uiFPControl |= _EM_ZERODIVIDE; uiFPNewControl = _controlfp( uiFPControl , _MCW_EM ); } Clearly from the include order in the -v output and -E output, the compiler is not finding the mingw float.h first. Looking at float.h, it #include_next's float.h, so clearly it is designed to supercede the system header. I'm able to work around this by explicitly adding -I/usr/include/mingw to the command line, but this produces an ugly warning message... cc1: warning: changing search order for system directory "/usr/include/mingw" cc1: warning: as it has already been specified as a non-system directory I'm using the 1.3.22-1 cygwin setup/install and installed both gcc 3.2-3 and gcc-mingw. Is this an installation problem? -- Stuart Downing sdowning at sign fame dot goes here com -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/