sh4 support

Forwarded: not yet.
BTS: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1027168

onetbb currently FTBFS on sh4 because the source code assumes that the target
FPU supports all four rounding modes (FE_TONEAREST, FE_DOWNWARD, FE_UPWARD and
FE_TOWARDZERO) which is not the case on sh4 which supports FE_TONEAREST and
FE_TOWARDZERO only [1].

The attached patch fixes these assumptions for sh4 and makes the code build. I
have already patched and uploaded the package to the unreleased distribution
so that the mold linker can build on sh4 as well.

I will forward the patch later after reformating it.
===================================================================

Gbp-Pq: Name sh4-support.patch

diff --git a/test/common/fp_control.h b/test/common/fp_control.h
index 9e18f8bb02703ec9791be9b4b19311ee4fd61234..6737efeaf7a2273ce3d30ece2e71cf1bf280151e 100644 (file)
--- a/test/common/fp_control.h
+++ b/test/common/fp_control.h
@@ -112,7 +112,11 @@ inline void SetRoundingMode ( int mode ) {
 
 #include <fenv.h>
 
+#if defined(__sh__)
+const int RND_MODE_MASK = FE_TONEAREST | FE_TOWARDZERO;
+#else
 const int RND_MODE_MASK = FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO;
+#endif
 
 const int NumSseModes = 1;
 const int SseModes[NumSseModes] = { 0 };
@@ -125,8 +129,13 @@ inline void SetSseMode ( int ) {}
 
 #endif /* Other archs */
 
+#if defined(__sh__)
+const int NumRoundingModes = 2;
+const int RoundingModes[NumRoundingModes] = { FE_TONEAREST, FE_TOWARDZERO };
+#else
 const int NumRoundingModes = 4;
 const int RoundingModes[NumRoundingModes] = { FE_TONEAREST, FE_DOWNWARD, FE_UPWARD, FE_TOWARDZERO };
+#endif
 const int numFPModes = NumRoundingModes*NumSseModes;
 
 inline void SetFPMode( int mode ) {