8274860: gcc 10.2.1 produces an uninitialized warning in sharedRuntim…

…eTrig.cpp Reviewed-by: phh
openjdk · Nov 19, 2021 · 5e08548 · 5e08548 · openjdk-notifier · Nov 19, 2021
1 parent 9b94409
commit 5e08548
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diff --git a/src/hotspot/share/runtime/sharedRuntimeTrig.cpp b/src/hotspot/share/runtime/sharedRuntimeTrig.cpp
@@ -297,7 +297,12 @@ static int __kernel_rem_pio2(double *x, double *y, int e0, int nx, int prec, con
     fw = 0.0;
     for (i=jz;i>=0;i--) fw += fq[i];
     y[0] = (ih==0)? fw: -fw;
+
+PRAGMA_DIAG_PUSH
+PRAGMA_MAYBE_UNINITIALIZED_IGNORED
     fw = fq[0]-fw;
+PRAGMA_DIAG_POP
+
     for (i=1;i<=jz;i++) fw += fq[i];
     y[1] = (ih==0)? fw: -fw;
     break;

diff --git a/src/hotspot/share/utilities/compilerWarnings.hpp b/src/hotspot/share/utilities/compilerWarnings.hpp
@@ -57,6 +57,7 @@
 // https://gcc.gnu.org/gcc-8/changes.html
 #if !defined(__clang_major__) && (__GNUC__ >= 8)
 #define PRAGMA_STRINGOP_TRUNCATION_IGNORED PRAGMA_DISABLE_GCC_WARNING("-Wstringop-truncation")
+#define PRAGMA_MAYBE_UNINITIALIZED_IGNORED PRAGMA_DISABLE_GCC_WARNING("-Wmaybe-uninitialized")
 #endif
 
 #if defined(__clang_major__) && \
@@ -84,6 +85,10 @@
 #define PRAGMA_STRINGOP_TRUNCATION_IGNORED
 #endif
 
+#ifndef PRAGMA_MAYBE_UNINITIALIZED_IGNORED
+#define PRAGMA_MAYBE_UNINITIALIZED_IGNORED
+#endif
+
 #ifndef PRAGMA_FORMAT_NONLITERAL_IGNORED
 #define PRAGMA_FORMAT_NONLITERAL_IGNORED
 #endif