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62 lines
1.9 KiB
62 lines
1.9 KiB
2 months ago
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From 93c5215677a71e9772f68a449533cb3c97d2b869 Mon Sep 17 00:00:00 2001
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From: Kinga Stefaniuk <kinga.stefaniuk@intel.com>
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Date: Thu, 4 Jul 2024 15:01:06 +0200
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Subject: [PATCH 131/157] Makefile: add more compiler flags
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It is essential to avoid vulnerabilities in code as much
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as possible using safe compilation flags. It is easier if
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they are added to the Makefile and applied during compilation.
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Add new gcc flags and make them configurable, because they
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may not be supported for some compilers.
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Set FORTIFY_SOURCE with the highest supported value for platform.
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Signed-off-by: Kinga Stefaniuk <kinga.stefaniuk@intel.com>
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---
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Makefile | 23 ++++++++++++++++++++++-
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1 file changed, 22 insertions(+), 1 deletion(-)
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diff --git a/Makefile b/Makefile
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index 3fe0a053..a914b178 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -30,7 +30,7 @@
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# define "CXFLAGS" to give extra flags to CC.
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# e.g. make CXFLAGS=-O to optimise
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-CXFLAGS ?=-O2 -D_FORTIFY_SOURCE=2
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+CXFLAGS ?=-O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE
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TCC = tcc
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UCLIBC_GCC = $(shell for nm in i386-uclibc-linux-gcc i386-uclibc-gcc; do which $$nm > /dev/null && { echo $$nm ; exit; } ; done; echo false No uclibc found )
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#DIET_GCC = diet gcc
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@@ -76,6 +76,27 @@ ifeq ($(origin STRINGOPOVERFLOW), undefined)
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endif
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endif
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+ifeq ($(origin NOSTRICTOVERFLOW), undefined)
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+ NOSTRICTOVERFLOW := $(shell $(CC) -Q --help=warning 2>&1 | grep "strict-overflow" | wc -l)
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+ ifneq "$(NOSTRICTOVERFLOW)" "0"
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+ CWFLAGS += -fno-strict-overflow
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+ endif
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+endif
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+
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+ifeq ($(origin NODELETENULLPOINTER), undefined)
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+ NODELETENULLPOINTER := $(shell $(CC) -Q --help=optimizers 2>&1 | grep "delete-null-pointer-checks" | wc -l)
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+ ifneq "$(NODELETENULLPOINTER)" "0"
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+ CWFLAGS += -fno-delete-null-pointer-checks
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+ endif
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+endif
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+
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+ifeq ($(origin WRAPV), undefined)
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+ WRAPV := $(shell $(CC) -Q --help=optimizers 2>&1 | grep "wrapv" | wc -l)
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+ ifneq "$(WRAPV)" "0"
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+ CWFLAGS += -fwrapv
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+ endif
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+endif
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+
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ifdef DEBIAN
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CPPFLAGS += -DDEBIAN
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endif
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--
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2.41.0
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