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nixpkgs/pkgs/development/compilers/gcc/7/riscv-pthread-reentrant.patch

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Index: gcc/config/riscv/linux.h
===================================================================
--- a/gcc/config/riscv/linux.h (revision 257620)
+++ b/gcc/config/riscv/linux.h (revision 257621)
@@ -47,6 +47,8 @@
#define ICACHE_FLUSH_FUNC "__riscv_flush_icache"
+#define CPP_SPEC "%{pthread:-D_REENTRANT}"
+
#define LINK_SPEC "\
-melf" XLEN_SPEC "lriscv \
%{shared} \