preprocessor/2948: different behaviour directly to C++ vs. saving -E output

[sean at mcneil dot com]

>Number:         2948
>Category:       preprocessor
>Synopsis:       different behaviour directly to C++ vs. saving -E output
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 25 15:16:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Sean McNeil
>Release:        3.1 20010524 (experimental)
>Organization:
>Environment:
FreeBSD 4.3 cross compiling to arm-wrs-vxworks
>Description:
When I compile a c++ file with the standard method of

arm-wrs-vxworks-gcc -c file.cpp

I get many additional undefined symbols that are bogus in the object file.  The preprocessor is obviously sending too much information to the backend.  If I compile in two steps:

arm-wrs-vxworks-gcc -E -o file.cc file.cpp
arm-wrs-vxworks-gcc -c file.cc

I observe the expected behavior and symbols are correct (no additional symbols).
>How-To-Repeat:
Compile the attached file equivalently as

arm-wrs-vxworks-gcc -mcpu=arm8 -mapcs-32 -mlittle-endian -ansi -nostdinc -pipe -fno-implicit-templates -DVXW_EXPLICIT_TEMPLATES -O2 -mno-sched-prolog -I/usr/wind/target/h -DCPU=ARMARCH4 -DARMEL -fno-exceptions -c PlotFile.cpp

Observe that there is a significant difference compiled this was a oppose to first with the -E option and then compiling that output.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
----gnatsweb-attachment----
Content-Type: text/cpp; name="PlotFile.cpp"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="PlotFile.cpp"