Cc'ing more developers.
On 10/3/26 14:47, Fabiano Rosas wrote:
Philippe Mathieu-Daudé <[email protected]> writes:
From: Akihiko Odaki <[email protected]>
https://gcc.gnu.org/onlinedocs/gcc-15.2.0/gcc/Warning-Options.html
Level 2 warns also about calls that might overflow the destination
buffer given an argument of sufficient length or magnitude. At level
2, unknown numeric arguments are assumed to have the minimum
representable value for signed types with a precision greater than 1,
and the maximum representable value otherwise. Unknown string
arguments whose length cannot be assumed to be bounded either by the
directive’s precision, or by a finite set of string literals they may
evaluate to, or the character array they may point to, are assumed to
be 1 character long.
Signed-off-by: Akihiko Odaki <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
---
meson.build | 1 +
1 file changed, 1 insertion(+)
diff --git a/meson.build b/meson.build
index 102f0cbb13e..f45885f05a1 100644
--- a/meson.build
+++ b/meson.build
@@ -694,6 +694,7 @@ warn_flags = [
'-Wempty-body',
'-Wendif-labels',
'-Wexpansion-to-defined',
+ '-Wformat-overflow=2',
'-Wformat-security',
'-Wformat-y2k',
'-Wignored-qualifiers',
This gives me:
../tests/qtest/ast2700-sgpio-test.c: In function ‘test_output_pins’:
../tests/qtest/ast2700-sgpio-test.c:27:33: error: ‘sprintf’ may write a
terminating nul past the end of the destination
[-Werror=format-overflow=]
../tests/qtest/ast2700-sgpio-test.c: In function ‘test_irq_level_high’:
../tests/qtest/ast2700-sgpio-test.c:85:33: error: ‘sprintf’ may write a
terminating nul past the end of the destination
[-Werror=format-overflow=]
../tests/qtest/arm-cpu-features.c: In function
‘test_query_cpu_model_expansion_kvm’:
../tests/qtest/arm-cpu-features.c:578:35: error: ‘%u’ directive writing
between 1 and 10 bytes into a region of size 5
[-Werror=format-overflow=]
../configure
--target-list=x86_64-softmmu,i386-softmmu,aarch64-softmmu,arm-softmmu,ppc64-softmmu,s390x-softmmu,riscv64-softmmu,aarch64-linux-user,loongarch64-softmmu
--disable-plugins --enable-modules --enable-werror
--enable-trace-backends=log,dtrace --enable-debug --enable-docs
--enable-rust --enable-strict-rust-lints
gcc version 7.5.0 (SUSE Linux)
