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gh-112301: Enable compiler flags with low performance impact and no warnings #120975

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merged 5 commits into from
Jun 26, 2024
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gh-112301: Enable compiler flags with low performance impact and no warnings #120975

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98d9ea0
Enable subset of flags with low performance impact and no warnings
nohlson Jun 21, 2024
1e84a87
Remove redundant -fno-strict-overflow option from config
nohlson Jun 25, 2024
257e3d7
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 25, 2024
154fa05
Include explicit compiler options in news
nohlson Jun 25, 2024
1917b93
Remove trailing whitespace in news
nohlson Jun 25, 2024
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Security/2024-06-25-04-42-43.gh-issue-112301.god4IC.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Add default compiler options to improve security. Enable
-Wimplicit-fallthrough, -fstack-protector-strong, -Wtrampolines.
124 changes: 124 additions & 0 deletions configure
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10 changes: 10 additions & 0 deletions configure.ac
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Expand Up @@ -2451,6 +2451,16 @@ AS_VAR_IF([with_strict_overflow], [yes],
[BASECFLAGS="$BASECFLAGS $STRICT_OVERFLOW_CFLAGS"],
[BASECFLAGS="$BASECFLAGS $NO_STRICT_OVERFLOW_CFLAGS"])

# Enable flags that warn and protect for potential security vulnerabilities.
# These flags should be enabled by default for all builds.
AX_CHECK_COMPILE_FLAG([-Wimplicit-fallthrough], [BASECFLAGS="$BASECFLAGS -Wimplicit-fallthrough"], [AC_MSG_WARN([-Wimplicit-fallthrough not supported])])
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AX_CHECK_COMPILE_FLAG([-fstack-protector-strong], [BASECFLAGS="$BASECFLAGS -fstack-protector-strong"], [AC_MSG_WARN([-fstack-protector-strong not supported])])
case $CC in
*gcc*)
# Add GCC-specific compiler flags
AX_CHECK_COMPILE_FLAG([-Wtrampolines], [BASECFLAGS="$BASECFLAGS -Wtrampolines"], [AC_MSG_WARN([-Wtrampolines not supported])])
esac

case $GCC in
yes)
CFLAGS_NODIST="$CFLAGS_NODIST -std=c11"
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