gcc: Add version 10 to testing

testing/gcc/build

@@ -0,0 +1,52 @@
+#!/bin/sh -e
+
+# Make sure gmp is built with generic options.
+cp -v gcc/gmp/configfsf.guess gcc/gmp/config.guess
+cp -v gcc/gmp/configfsf.sub   gcc/gmp/config.sub
+
+# Use lib not lib64 by default.
+sed -i '/m64=/s/lib64/lib/' gcc/gcc/config/i386/t-linux64
+sed -i 's/lib64/lib/'       gcc/gcc/config/i386/linux64.h
+
+# Build must happen outside of gcc source.
+mkdir -p gcc-build
+cd gcc-build
+
+export libat_cv_have_ifunc=no
+
+../gcc/configure \
+    --prefix=/usr \
+    --disable-multilib \
+    --disable-symvers \
+    --disable-libmpx \
+    --disable-libmudflap \
+    --disable-libsanitizer \
+    --disable-werror \
+    --disable-fixed-point \
+    --disable-libstdcxx-pch \
+    --enable-checking=release \
+    --mandir=/usr/share/man \
+    --infodir=/usr/share/info \
+    --with-system-zlib \
+    --enable-__cxa_atexit \
+    --enable-default-pie \
+    --enable-default-ssp \
+    --enable-shared \
+    --enable-threads \
+    --enable-tls \
+    --enable-languages=c,c++ \
+    --build=x86_64-pc-linux-musl
+
+make
+make DESTDIR="$1" install
+
+# Save 35MB.
+find "$1" -name libgtkpeer.a  -delete
+find "$1" -name libgjsmalsa.a -delete
+find "$1" -name libgij.a      -delete
+
+# Some legacy programs will expect cc
+ln -s gcc "$1/usr/bin/cc"
+
+# POSIX compliance.
+install -Dm755 ../c99 "$1/usr/bin/c99"

testing/gcc/checksums

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+e81ed4db3ded02fae64233d2028cdca0b630fc022d47d0ef6b8dd09c6bfcdfa5  gcc-10-20200209.tar.xz
+87b565e89a9a684fe4ebeeddb8399dce2599f9c9049854ca8c0dfbdea0e21912  gmp-6.1.2.tar.xz
+1d3be708604eae0e42d578ba93b390c2a145f17743a744d8f3f8c2ad5855a38a  mpfr-4.0.2.tar.xz
+6985c538143c1208dcb1ac42cedad6ff52e267b47e5f970183a3e75125b43c2e  mpc-1.1.0.tar.gz
+765614b3396d70bca3fa0ae4a813632486c6dca320e2bd13c8c39dca52be4a4c  c99

testing/gcc/depends

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+binutils
+bison
+flex
+linux-headers
+zlib

testing/gcc/files/c99

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+#!/bin/sh
+exec cc -std=c99 "$@"

testing/gcc/sources

@@ -0,0 +1,5 @@
+https://gcc.gnu.org/pub/gcc/snapshots/LATEST-10/gcc-10-20200209.tar.xz gcc
+https://gmplib.org/download/gmp/gmp-6.1.2.tar.xz gcc/gmp
+https://ftp.gnu.org/gnu/mpfr/mpfr-4.0.2.tar.xz gcc/mpfr
+https://ftp.gnu.org/gnu/mpc/mpc-1.1.0.tar.gz gcc/mpc
+files/c99

testing/gcc/version

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+git 1