https://sourceware.org/bugzilla/show_bug.cgi?id=19161
Bug ID: 19161
Summary: GNU ld wrongly garbage collects section referenced via
__start_SECTIONNAME
Product: binutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: xinliangli at gmail dot com
Target Milestone: ---
Here is a small reproducible:
// Failed with gnu ld
gcc -fuse-ld=bfd -fdata-sections -Wl,--gc-sections gctest.c gctest2.c
/tmp/cc4jxArE.o: In function `dump':
gctest2.c:(.text+0xc): undefined reference to `__start_my_section'
collect2: error: ld returned 1 exit status
// Fine with Gold:
gcc -fuse-ld=gold -fdata-sections -Wl,--gc-sections gctest.c gctest2.c
// gctest.c
extern int variable;
int main()
{
return variable;
}
// gctest2.c
typedef struct A {
int i;
int j;
} A;
extern int printf(const char*,...);
extern int atexit(void (*)(void));
A __attribute__((section("my_section"))) a[2] = {{1,2}, {3,4}};
extern A __start_my_section;
extern A __stop_my_section;
int variable = 0;
void dump()
{
A* ap = &__start_my_section;
printf("%d %d\n", ap->i, ap->j);
}
void __attribute__((constructor)) foo() {
atexit(dump);
}
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