[Bug 203437] imake doesn't work with clang, again

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203437

            Bug ID: 203437
           Summary: imake doesn't work with clang, again
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: lampa at fit.vutbr.cz

Current imake port doesn't work with clang (FreeBSD-10+). BUILD_DEPENDS
requires tradcpp, but imake will always use cc:

imake -v  -DUseInstalled -I/usr/local/lib/X11/config
cc -I. -Uunix -D__amd64__ -D__amd64__ -traditional -DUseInstalled
-I/usr/local/lib/X11/config -E -v Imakefile.c
...

imake Makefile contains
CPP_PROGRAM = tradcpp
but this is ignored, since USE_CC_E has greater priority and it is set, see

work/imake-1.0.7/imake.c (287)
#ifndef CROSSCOMPILE
# ifdef USE_CC_E
#  ifndef DEFAULT_CC
#   define DEFAULT_CC "cc"
#  endi
# else
#  ifndef DEFAULT_CPP
#   ifdef CPP_PROGRAM
#    define DEFAULT_CPP CPP_PROGRAM
#   else
#    define DEFAULT_CPP "/lib/cpp"
#   endif
#  endif
# endif
#endif


work/imake-1.0.7/imakemdep.h  (304)
#   if defined(__FreeBSD__)  || defined(__NetBSD__) || defined(__OpenBSD__) ||
d
efined(__DragonFly__)
#    define USE_CC_E
#   endif
...
#   if defined(__GNUC__) && !defined(USE_CC_E)
#    define USE_CC_E
#    ifndef DEFAULT_CC
#     define DEFAULT_CC "gcc"
#    endif
#   endif

To get tradcpp I had to remove both these tests. Proper solution is probably to
set DEFAULT_CC=tradcpp in configure or make invocation. It seems that
ac_cv_path_RAWCPP=tradcpp in port Makefile is ignored.

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