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https://github.com/Divested-Mobile/DivestOS-Build.git
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54 lines
1.6 KiB
Diff
54 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Micay <danielmicay@gmail.com>
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Date: Wed, 23 Aug 2017 20:28:03 -0400
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Subject: [PATCH] use -fwrapv when signed overflow checking is off
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---
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cc/cc.go | 2 ++
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cc/sanitize.go | 12 ++++++++++++
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2 files changed, 14 insertions(+)
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diff --git a/cc/cc.go b/cc/cc.go
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index 51ac18404..2829dab32 100644
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--- a/cc/cc.go
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+++ b/cc/cc.go
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@@ -687,6 +687,8 @@ func (c *Module) GenerateAndroidBuildActions(actx android.ModuleContext) {
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}
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if c.sanitize != nil {
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flags = c.sanitize.flags(ctx, flags)
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+ } else {
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+ flags.CFlags = append(flags.CFlags, "-fwrapv")
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}
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if c.coverage != nil {
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flags = c.coverage.flags(ctx, flags)
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diff --git a/cc/sanitize.go b/cc/sanitize.go
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index de970352e..17c11f8b1 100644
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--- a/cc/sanitize.go
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+++ b/cc/sanitize.go
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@@ -314,6 +314,7 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
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flags.LdFlags = append(flags.LdFlags, "-Wl,--exclude-libs,"+minimalRuntimeLib)
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}
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if !sanitize.Properties.SanitizerEnabled {
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+ flags.CFlags = append(flags.CFlags, "-fwrapv")
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return flags
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}
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@@ -355,6 +356,17 @@ func (sanitize *sanitize) flags(ctx ModuleContext, flags Flags) Flags {
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sanitizers = append(sanitizers, sanitize.Properties.Sanitize.Misc_undefined...)
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}
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+ wrapv := true
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+ for _, element := range sanitizers {
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+ if (element == "signed-integer-overflow" || element == "integer" || element == "undefined") {
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+ wrapv = false
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+ break
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+ }
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+ }
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+ if wrapv {
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+ flags.CFlags = append(flags.CFlags, "-fwrapv")
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+ }
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+
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if Bool(sanitize.Properties.Sanitize.Diag.Undefined) {
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diagSanitizers = append(diagSanitizers, "undefined")
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}
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