63 lines
2.2 KiB
Text
63 lines
2.2 KiB
Text
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Watcom compiler notes
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=====================
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Status
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------
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Not yet usable. Although the library builds under Watcom it
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substantially fails the test suite.
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There is a working Wmakefile for wmake for the library build.
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invoke as any of:
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wmake -f Wmakefile clean WC
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wmake -f Wmakefile clean WC-inlined
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wmake -f Wmakefile clean WCE
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wmake -f Wmakefile clean WCE-inlined
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These build pthreadWC.dll and pthreadWCE.dll.
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There is a working Wmakefile for wmake for the test suite.
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invoke as any of:
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wmake -f Wmakefile clean WC
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wmake -f Wmakefile clean WCX
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wmake -f Wmakefile clean WCE
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wmake -f Wmakefile clean WC-bench
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wmake -f Wmakefile clean WCX-bench
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wmake -f Wmakefile clean WCE-bench
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Current known problems
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----------------------
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Library build:
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The Watcom compiler uses a different default call convention to MS C or GNU C and so
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applications are not compatible with pthreadVC.dll etc using pre 2003-10-14 versions
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of pthread.h, sched.h, or semaphore.h. The cdecl attribute can be used on exposed
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function prototypes to force compatibility with MS C built DLLs.
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However, there appear to be other incompatibilities. Errno.h, for example, defines
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different values for the standard C and POSIX errors to those defined by the MS C
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errno.h. It may be that references to Watcom's threads compatible 'errno' do set
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and return translated numbers consistently, but I have not verified this.
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Watcom defines errno as a dereferenced pointer returned by the function
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_get_errno_ptr(). This is similar to both the MS and GNU C environments for
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multithreaded use. However, the Watcom version appears to have a number of problems:
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- different threads return the same pointer value. Compare with the MS and GNU C
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versions which correctly return different values (since each thread must maintain
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a thread specific errno value).
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- an errno value set within the DLL appears as zero in the application even though
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both share the same thread.
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Therefore applications built using the Watcom compiler may need to use
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a Watcom built version of the library (pthreadWC.dll). If this is the case, then
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the cdecl function attribute should not be required.
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Application builds:
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The test suite fails with the Watcom compiler.
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Test semaphore1.c fails for pthreadWC.dll because errno returns 0 instead of EAGAIN.
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