Patches for gcc on Minerva

0001-Add-a-gcc-driver-for-Minerva.patch

Add a gcc driver for Minerva

This patch adds support for the *-*-minerva target to gcc.

It specifies which flags need to be passed to the linker, defines the minerva macro, sets the correct underlying type of size_t and ptrdiff_t, and enables IFUNCs.

0002-fixincludes-Skip-for-Minerva-targets.patch

fixincludes: Skip for Minerva targets

fixincludes is responsible for fixing mistakes in system headers that rely in compiler extensions that GCC doesn't support or cause errors in C++ mode.

Our headers don't have such problems, so this hack is of no use for us.

0003-libgcc-Build-for-Minerva.patch

libgcc: Build for Minerva

This patch enables building gcc's own C runtime files, and sets up exception handling support.

0004-libgcc-Do-not-link-libgcc_s-to-LibC.patch

libgcc: Do not link libgcc_s to LibC

The toolchain is built before LibC, so linking to the C runtime library would fail.

0005-i386-Disable-math-errno-for-Minerva.patch

i386: Disable math errno for Minerva

Minerva uses exceptions for math error handling, which allows the compiler to do more optimizations on calls to math functions. This patch has the effect of setting -fno-math-errno by default.

0006-libstdc-Support-Minerva.patch

libstdc++: Support Minerva

During the toolchain build, Minerva libraries are not available, so we have to manually tell libstdc++ about what our LibC supports.

In most places, we take the Newlib code paths.

0007-libstdc-Build-static-library-with-fPIC.patch

libstdc++: Build static library with -fPIC

We want the libstdc++.a library to contain -fPIC code in order to link it statically into LibC/our shared objects. However, the build system forces no-pic/pie instead.

This hack is from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58638

0008-RISC-V-Implement-__init_riscv_feature_bits-for-Seren.patch

RISC-V: Implement __init_riscv_feature_bits for Minerva

The Minerva dynamic linker provides a magic function "get_riscv_feature_bits" that populates riscv_feature_bits and __riscv_cpu_model.