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Add explanation for xxxL macro definitions to xc.c

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Define alternative macros for CSTKPTR, PVAR, and IVAR that can be used
in an lvalue context, since CSTKPTR = ...; would generate
error: assignment to cast is illegal, lvalue casts are not supported

A similar issue drives the PCMAC/PCMACL defines, although there it is
that the rvalue is (pccache - 1) and the lvalue is (pccache)
This commit is contained in:
Nick Briggs 2023-01-12 11:27:24 -08:00
parent b3f97a85c8
commit 336c13369a
1 changed files with 5 additions and 0 deletions
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src/xc.c
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@ -134,6 +134,11 @@ LispPTR tscache asm("bx");
#define IVAR ((LispPTR *)IVar)
#define BCE_CURRENTFX ((struct frameex2 *)((DLword *)PVAR - FRAMESIZE))
/* Define alternative macros for CSTKPTR, PVAR, and IVAR that can be used
* in an lvalue context, since CSTKPTR = ...; would generate
* error: assignment to cast is illegal, lvalue casts are not supported
*/
#define CSTKPTRL (cspcache)
#define PVARL PVar
#define IVARL IVar