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accel/tcg: Remove special case for GCC < 4.6
Since commit efc6c070aca ("configure: Add a test for the minimum compiler version") the minimum compiler version required for GCC is 4.8. We can safely remove the special case for GCC 4.6 introduced in commit 0448f5f8b81 ("cpu-exec: Fix compiler warning (-Werror=clobbered)"). No change for Clang as we don't know. Backports 19a84318c674c157f1b04c5c99595379f8ac8bb3
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@ -543,7 +543,7 @@ int cpu_exec(struct uc_struct *uc, CPUState *cpu)
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/* prepare setjmp context for exception handling */
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if (sigsetjmp(cpu->jmp_env, 0) != 0) {
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#if defined(__clang__) || !QEMU_GNUC_PREREQ(4, 6)
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#if defined(__clang__)
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/* Some compilers wrongly smash all local variables after
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* siglongjmp. There were bug reports for gcc 4.5.0 and clang.
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* Reload essential local variables here for those compilers.
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