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Fix a preprocessor expression evaluation bug

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A subexpression in parentheses lost its string/int type flag and
instead used whatever type was left in the stack entry from
previous use.  In practice we mostly got away with this because
most preprocessor expressions are integer, but it could have
resulted in a preprocessor expression incorrectly evaluating as
zero.  If -Wextra was in use you got a warning:

Warning 202: Error: 'Can't mix strings and integers in expression'

Fixes #1384
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Olly Betts 2022-02-23 18:52:44 +13:00
commit 204a5f7bf3
3 changed files with 28 additions and 0 deletions
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@ -7,6 +7,17 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
Version 4.1.0 (in progress)
===========================
2022-02-23: olly
#1384 Fix a preprocessor expression evaluation bug. A
subexpression in parentheses lost its string/int type flag and
instead used whatever type was left in the stack entry from
previous use. In practice we mostly got away with this because
most preprocessor expressions are integer, but it could have
resulted in a preprocessor expression incorrectly evaluating as
zero. If -Wextra was in use you got a warning:
Warning 202: Error: 'Can't mix strings and integers in expression'
2022-02-20: wsfulton
Fix %warnfilter warning suppress for warning 315 SWIGWARN_PARSE_USING_UNDEF.