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[PULL,6/8] target/arm: Avoid maybe-uninitialized warning with gcc 4.9

Message ID 20200803193359.12936-7-peter.maydell@linaro.org
State New
Headers show
Series [PULL,1/8] hw/arm/netduino2, netduinoplus2: Set system_clock_scale | expand

Commit Message

Peter Maydell Aug. 3, 2020, 7:33 p.m. UTC
From: Kaige Li <likaige@loongson.cn>

GCC version 4.9.4 isn't clever enough to figure out that all
execution paths in disas_ldst() that use 'fn' will have initialized
it first, and so it warns:

/home/LiKaige/qemu/target/arm/translate-a64.c: In function ‘disas_ldst’:
/home/LiKaige/qemu/target/arm/translate-a64.c:3392:5: error: ‘fn’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
     fn(cpu_reg(s, rt), clean_addr, tcg_rs, get_mem_index(s),
/home/LiKaige/qemu/target/arm/translate-a64.c:3318:22: note: ‘fn’ was declared here
     AtomicThreeOpFn *fn;

Make it happy by initializing the variable to NULL.

Signed-off-by: Kaige Li <likaige@loongson.cn>
Message-id: 1596110248-7366-2-git-send-email-likaige@loongson.cn
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
[PMM: Clean up commit message and note which gcc version this was]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
 target/arm/translate-a64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index 8c0764957c8..c98dfb17a83 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -3315,7 +3315,7 @@  static void disas_ldst_atomic(DisasContext *s, uint32_t insn,
     bool r = extract32(insn, 22, 1);
     bool a = extract32(insn, 23, 1);
     TCGv_i64 tcg_rs, clean_addr;
-    AtomicThreeOpFn *fn;
+    AtomicThreeOpFn *fn = NULL;
     if (is_vector || !dc_isar_feature(aa64_atomics, s)) {