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https://github.com/Divested-Mobile/DivestOS-Build.git
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50 lines
1.7 KiB
Diff
50 lines
1.7 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 49dce18f9..8bd39b2f4 100644
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--- a/cc/cc.go
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+++ b/cc/cc.go
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@@ -962,6 +962,8 @@ 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, deps = c.coverage.flags(ctx, flags, deps)
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diff --git a/cc/sanitize.go b/cc/sanitize.go
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index c1b055afe..147ee2d88 100644
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--- a/cc/sanitize.go
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+++ b/cc/sanitize.go
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@@ -433,9 +433,21 @@ 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 && !sanitize.Properties.UbsanRuntimeDep {
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+ flags.CFlags = append(flags.CFlags, "-fwrapv")
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return flags
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}
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+ wrapv := true
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+ for _, element := range sanitize.Properties.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.Address) {
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if ctx.Arch().ArchType == android.Arm {
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// Frame pointer based unwinder in ASan requires ARM frame setup.
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