Compiler appears to include .cpp source instead/addition to .h header file

Numerous source files in our project depend upon unix/dcfPosixLocks.h and must be linked with the dcfPosixLocks.o that results from compiling unix/dcfPosixLocks.cpp. While all of these numerous sources files either directly or indirectly #include "unix/dcfPosixLocks.*_h_*" none of them ever #include "unix/dcfPosixLocks.*_cpp_*" (or any other non .h file for that matter). Yet, the C++ compiler incorrectly appears to include unix/dcfPosixLocks.cpp instead of (or in addition to) unix/dcfPosixLocks.h, for example when compiling dcfConstants.cpp (actual invocation and error below). Renaming unix/dcfPosixLocks.cpp to unix/dcfPosixLocks.c (or other names with C/C++ related file extensions) results in similar behavior. We first discovered this problem when we moved from a partially patched Studio 11 on Solaris 9 SPARC to an unpatched Studio 11 on Solaris 10 SPARC, i.e. it works fine on the old system. The problem remains after fully patching Studio 11 on Solaris 10 SPARC and even after fully patching Studio 12 on Solaris 10 SPARC. The implication is that one of the Studio 11 patches broke the C++ preprocessor and has of course been carried over into Studio 12. Since we use gmake to compile multiple sources concurrently, we ruled gmake out as a source of the problem by eliminating concurrent compilation (e.g. -j1 not -j2) and by tracing it to ensure that it was not deciding to compile unix/dcfPosixLocks.cpp (e.g. due to some implicit rule or something like that). Workaround #1, since the dcfConstants.cpp file contains no templates, is to separately preprocess and then compile, i.e. CC -E dcfConstants.cpp 1> .../dcfConstants.i and then CC -c dcfConstants.i -o .../dcfConstants.o. Of course, workaround #1 is dubious in general and completely unworkable where templates are involved. Workaround #2 is to move the unix/dcfPosixLocks.cpp file out of the include path (many of the directories in our include path contain both source and header files). Unfortunately, workaround #2 is problematic from a source control point of view... implies lots of source files being moved unnecessarily from one location to another to artificially distinguish them from header files, breaking historical chains in the process (granted, depends on the abilities of your source control software). Any thoughts or comments? We are hoping that somebody might be able to help us discover the errors in our ways, contribute additional workarounds, and/or confirm that this is in fact a compiler bug. I can try to provide more information as needed. Thank you in advance. -R
/opt/studio11/SUNWspro/bin/CC -G -KPIC -w -mt
-D_POSIX_PTHREAD_SEMANTICS -DCXX_SUNPRO -DDCF_NO_STD_MIN -g
-D_DEBUG -DDCF_ASSERTIONS_ABORT -DDCF_DEADLOCK_ABORTS -DDC F_EXCEPTIONS_ABORT -I. -I/export/home/buildsys/src/build/tmp.3/dcf1/inc
-I/export/home/buildsys/src/build/tmp.3/dcf1/platform/unix/solaris/inc
-I/export/home/buildsys/src/build/tmp.3/dcf1/platform/unix/solaris/inc
-I/export/home/buildsys/src/build/tmp.3/dcf1/platform/unix/inc
-Iunix/solaris -Iunix
-I/export/home/buildsys/src/build/tmp.3/dcf1/interfaces
-I/export/home/buildsys/src/build/tmp.3/dcf1/platform/unix/solaris/interfaces.overlay
-I/export/home/buildsys/src/build/tmp.3/dcf1/interfaces.overlay
-c dcfConstants.cpp -o Debug/unix/solaris/dcfConstants.o
"unix/dcfPosixLocks.*_cpp_*", line 72: Error:
dcfLocks::oAtomicAccessToLong is initialized twice.
"unix/dcfPosixLocks.*_cpp_*", line 103: Error:
dcfMutexAttributes::pSingleton is initialized twice.
2 Error(s) detected.
gmake[2]: *** [Debug/unix/solaris/dcfConstants.o] Error 2
gmake[1]: *** [all-r] Error 1
gmake: *** [build] Error 2

I'm having trouble understanding what change in Sun compilers or in Solaris could have resulted in the change in behavior you report.
For template code, Sun compilers have always used the automatic inclusion model described in the C++ Users Guide section 5.2, "Template Definitions".
Specifically, if you include a header foo.h that declares one or more templates, the compiler will automatically include foo.cpp (or foo.cc, foo.C, etc) if it needs a definition of one of those templates. That is, it assumes that template definitions missing from foo.h will be in foo.cpp.
Does that answer your question?

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