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From 9c8a95b916897ce7c2f23aa9d254517699d5b8b1 Mon Sep 17 00:00:00 2001
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From: Mamoru TASAKA <mtasaka@fedoraproject.org>
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Date: Sat, 4 Feb 2017 00:41:46 +0900
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Subject: [PATCH 4/5] init_crystal: kill gcc7 -Wint-in-bool-context
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gcc7 -Wall now warns:
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../../hacks/crystal.c:1009:31: warning: '*' in boolean context, suggest '&&' instead [-Wint-in-bool-context]
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../../hacks/crystal.c:97:30:
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#define NRAND(n) ( (n) ? (int) (LRAND() % (n)) : 0)
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~~~
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../../hacks/crystal.c:1009:31:
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cryst->offset_h = NRAND(2 * cryst->offset_h);
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../../hacks/crystal.c:97:31: note: in definition of macro 'NRAND'
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#define NRAND(n) ( (n) ? (int) (LRAND() % (n)) : 0)
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^
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This warning means that the usage of "2 *" is highly questionable
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because this multiplication does not change the result of boolean
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result (unless such multiplication overflows - which is undefined).
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However, in this case, such multiplicated value is used afterwards
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(as a denominator), so this warning here is not meaningful.
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But this warning can be easily eliminated, so let's fix this.
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---
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hacks/crystal.c | 9 +++++++--
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1 file changed, 7 insertions(+), 2 deletions(-)
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diff --git a/hacks/crystal.c b/hacks/crystal.c
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index 9dfa5ea..efa7704 100644
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--- a/hacks/crystal.c
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+++ b/hacks/crystal.c
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@@ -1005,8 +1005,13 @@ init_crystal(ModeInfo * mi)
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cryst->offset_h = (int) ((cryst->win_height - cryst->b * cos((
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cryst->gamma - 90) * PI_RAD)) / 2.0);
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if (!centre) {
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- if (cryst->offset_h > 0)
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- cryst->offset_h = NRAND(2 * cryst->offset_h);
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+ if (cryst->offset_h > 0) {
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+ /* once put the multiplication result to another variable here
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+ to aviod warning from gcc7 -Wint-in-bool-context
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+ */
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+ int denom = 2 * cryst->offset_h;
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+ cryst->offset_h = NRAND(denom);
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+ }
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cryst->offset_w = (int) (cryst->win_width - cryst->a -
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cryst->b *
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fabs(sin((cryst->gamma - 90) * PI_RAD)));
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--
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2.11.1
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