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[libc] Disable overflow test in strfromtest on riscv32 #166719

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Merged
merged 3 commits into from
Nov 6, 2025
Merged

[libc] Disable overflow test in strfromtest on riscv32 #166719

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42dc08b
Comment out CharsWrittenOverflow test in strfromtest
mleleszi Nov 6, 2025
ddbd633
Only disable test for riscv 32
mleleszi Nov 6, 2025
ba012cd
Simplify macro def
mleleszi Nov 6, 2025
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1 change: 1 addition & 0 deletions libc/test/src/stdlib/CMakeLists.txt
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Expand Up @@ -187,6 +187,7 @@ add_header_library(
DEPENDS
libc.src.__support.CPP.type_traits
libc.src.__support.FPUtil.fp_bits
libc.src.__support.macros.properties.architectures
)

add_libc_test(
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4 changes: 4 additions & 0 deletions libc/test/src/stdlib/StrfromTest.h
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Expand Up @@ -8,6 +8,7 @@

#include "src/__support/CPP/type_traits.h"
#include "src/__support/FPUtil/FPBits.h"
#include "src/__support/macros/properties/architectures.h"
#include "test/UnitTest/ErrnoCheckingTest.h"
#include "test/UnitTest/ErrnoSetterMatcher.h"
#include "test/UnitTest/Test.h"
Expand Down Expand Up @@ -484,14 +485,17 @@ class StrfromTest : public LIBC_NAMESPACE::testing::ErrnoCheckingTest {
ASSERT_STREQ_LEN(written, buff, "-NAN");
}

// https://github.com/llvm/llvm-project/issues/166795
void charsWrittenOverflow(FunctionT func) {
#ifndef LIBC_TARGET_ARCH_IS_RISCV32
char buff[100];
// Trigger an overflow in the return value of strfrom by writing more than
// INT_MAX bytes.
int result = func(buff, sizeof(buff), "%.2147483647f", 1.0f);

EXPECT_LT(result, 0);
ASSERT_ERRNO_FAILURE();
#endif
}
};

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