On Thu, Dec 11, 2003 at 04:41:47PM +0100, Michael Lampe wrote: >David Dawes wrote: > >>>> Do the gcc people give a reason for not allowing a system directory to >>>> be "blessed" with -I? >>> >>>I wouldn't call it a "reason", but the manual puts it like this: >>> >>>"(...) the option is ignored to ensure that the default search order for >>>system directories and the special treatment of system headers are not >>>defeated". >> >> OK, I see. This is to prevent system directories being searched >> before directories containing gcc-specific replacements for system >> headers. > >Even worse. Current CVS fails to build xterm with gcc 2.95.3 because of >this '-I/usr/include': > >gcc -c -O2 -march=i686 -fomit-frame-pointer -ansi -pedantic -Wall >-Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes >-Wmissing-declarations -Wredundant-decls -Wnested-externs -Wundef >-I../../exports/include -I/usr/include -I/usr/include/freetype2 >-I../../exports/include/X11 -I../.. -I../../exports/include >-I../../exports/include -Dlinux -D__i386__ -D_POSIX_C_SOURCE=199309L >-D_POSIX_SOURCE -D_XOPEN_SOURCE -D_BSD_SOURCE -D_SVID_SOURCE >-D_GNU_SOURCE -DNO_MESSAGE_CATALOG -DFUNCPROTO=15 -DNARROWPROTO -I. > -DSCROLLBAR_RIGHT -DOPT_WIDE_CHARS -DOPT_LUIT_PROG -DXRENDERFONT >-DXFREE86_FT2 -DPROJECTROOT=/opt/XFree86-4.4 charproc.c >In file included from charproc.c:123: >/usr/include/error.h:26: parse error > >This is because gcc now includes /usr/include/error.h instead of error.h >from programs/xterm. > >One should never put an explicit '-I/usr/include' or >'-I/usr/local/include' in CFLAGS because this can lead to all sorts of >strange behaviour.
Never /usr/local/include?? That's ridiculous. How are you deciding which ones are allowed and which are not? If you use these and have local headers that might conflict, then you must put -I. in explicitly first. Then there is no ambiguity. I'd say that's what needs to happen for xterm/Imakefile. If someone wants to try builds that currently rely on -I/usr/include and make sure they work correctly when they are removed, please do, and send reports of any problems. David -- David Dawes developer/release engineer The XFree86 Project www.XFree86.org/~dawes _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
