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Implement -Wtruncation=level (#931)

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* Implement -Wtruncation=level

-Wtruncation=0 is the same as the current -Wno-truncation.
-Wtruncation=2 is the same as the current -Wtruncation.
-Wtruncation=1 is the new default; it's less strict, allowing
N-bit values to be between -2**N and 2**N (exclusive).

* Implement generic "parametrized warning" system

* Test more `Wtruncation` variants

Co-authored-by: ISSOtm <eldredhabert0@gmail.com>
This commit is contained in:
Rangi
2021-10-31 17:47:31 -04:00
committed by GitHub
parent 0ce66009c1
commit 11a6a81169
8 changed files with 267 additions and 47 deletions
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src/asm/rgbasm.1
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@@ -248,10 +248,20 @@ Warn when shifting right a negative value.
Use a division by 2**N instead.
.It Fl Wshift-amount
Warn when a shift's operand is negative or greater than 32.
.It Fl Wno-truncation
.It Fl Wtruncation=
Warn when an implicit truncation (for example,
.Ic db )
loses some bits.
.Ic db
to an 8-bit value) loses some bits.
.Fl Wtruncation=0
or
.Fl Wno-truncation
disables this warning.
.Fl Wtruncation=1
warns when an N-bit value's absolute value is 2**N or greater.
.Fl Wtruncation=2
or just
.Fl Wtruncation
also warns when an N-bit value is below -2**(N-1), which will not fit in two's complement encoding.
.It Fl Wno-user
Warn when the
.Ic WARN