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[GCDAProfiling] Suppress -Wprio-ctor-dtor for GCC>=9 and remove unused write_string/length_of_string 

The `__attribute__((destructor(100)))` diagnostic does not have a
warning option in GCC 8 (before r264853) and thus cannot be suppressed.
This commit is contained in:
Fangrui Song 2020-09-02 12:21:06 -07:00
parent 737a4501e8
commit 1cfde143e8
1 changed files with 3 additions and 16 deletions
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19
compiler-rt/lib/profile/GCDAProfiling.c
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@ -210,22 +210,6 @@ static void write_64bit_value(uint64_t i) {
write_32bit_value(hi);
}
static uint32_t length_of_string(const char *s) {
return (strlen(s) / 4) + 1;
}
// Remove when we support libgcov 9 current_working_directory.
#if !defined(_MSC_VER) && defined(__clang__)
__attribute__((unused))
#endif
static void
write_string(const char *s) {
uint32_t len = length_of_string(s);
write_32bit_value(len);
write_bytes(s, strlen(s));
write_bytes("\0\0\0\0", 4 - (strlen(s) % 4));
}
static uint32_t read_32bit_value() {
uint32_t val;
@ -632,6 +616,9 @@ void llvm_writeout_files(void) {
// __attribute__((destructor)) and destructors whose priorities are greater than
// 100 run before this function and can thus be tracked. The priority is
// compatible with GCC 7 onwards.
#if __GNUC__ >= 9
#pragma GCC diagnostic ignored "-Wprio-ctor-dtor"
#endif
__attribute__((destructor(100)))
#endif
static void llvm_writeout_and_clear(void) {