https://bugs.llvm.org/show_bug.cgi?id=37997
Bug ID: 37997
Summary: Compiler generating assembly that causes a warning
about incorrect section attributes when assembled
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedb...@nondot.org
Reporter: douglas_y...@playstation.sony.com
CC: llvm-bugs@lists.llvm.org
Upstream change r335558 added a warning when the compiler assembles a file that
contains section attributes that are incorrect for certain sections. The
problem is that the compiler itself generates these incorrect attributes, so
either the warning should be relaxed, or the compiler fixed if it is truly
incorrect to generate.
Consider the following code:
/* test.cc */
static volatile int v;
static void __attribute__((noinline))
e (int i, double j) {
v = 0;
}
static void __attribute__((noinline))
d (int i, double j) {
e (i, ++j);
}
static void __attribute__((noinline))
c (int i, double j) {
d (i * 20, j * 20);
}
static void __attribute__((noinline))
a (int i, double j) {
d (i + 1, j + 1);
}
int main () {
if (v)
a (1, 1.25);
else
c (5, 5.25);
return 0;
}
Using a linux compiler built from r335558, I generated an assembly file, and
then fed the assembly file back into the compiler like this:
clang -g -O2 -S test.cc -o test.s
clang test.s
Doing that causes the compiler to emit the following warnings:
test.s:40:2: warning: setting incorrect section attributes for .rodata.cst8
.section .rodata.cst8,"aM",@progbits,8
^
test.s:63:2: warning: setting incorrect section attributes for .rodata.cst8
.section .rodata.cst8,"aM",@progbits,8
^
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