0000519: extras/graphics/mercury_tcltk library may contain reference to unknown matherr symbol

Mercury Bugs - mercury
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ID	Project	Category	View Status	Date Submitted	Last Update
0000519	mercury	Bug	public	2020-09-17 05:14	2020-10-01 23:08

Reporter	keri
Assigned To	juliensf
Priority	normal	Severity	minor	Reproducibility	always
Status	resolved	Resolution	fixed
Platform		OS		OS Version
Product Version
Target Version		Fixed in Version

Summary	0000519: extras/graphics/mercury_tcltk library may contain reference to unknown matherr symbol
Description	mtcltk.m contains the following: /* The following variable is a special hack that is needed in order for Sun shared libraries to be used for Tcl. / :- pragma foreign_code("C", " extern int matherr(void); int tclDummyMathPtr = (int ) matherr; "). This workaround is no longer necessary with modern versions of Tcl and the matherr() function has been removed since version 8.4. [1] While libmercury_tcltk.so may be built, the resultant library may cause problems. For example, after building extras/graphics/mercury_tcltk: $ cd extras/graphics/samples/calc $ mmc --search-lib-files-dir ../../mercury_tcltk --library mercury_tcltk --make calc <snip> Making calc * Error making 'calc'. ../../mercury_tcltk/libmercury_tcltk.so: undefined reference to 'matherr' collect2: error: ld returned 1 exit status We could either just remove the workaround or perhaps wrap it in some ifdef/endif block. [1] https://wiki.tcl-lang.org/page/tclDummyMathPtr
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