Build picolibc too

To make C++ work, this requires patching the GCC headers that are
built. This would have been done by crosstool-ng, but sdk-ng doesn't
use a GCC version known to crosstool-ng, so none of the crosstool-ng
patches are applied.

Signed-off-by: Keith Packard <keithp@keithp.com>

Author: keith-packard

configs/arm.config

@@ -70,3 +70,8 @@ CT_LIBC_NEWLIB_NANO_ENABLE_TARGET_OPTSPACE=y
 # CT_LIBC_NEWLIB_NANO_LTO is not set
 CT_LIBC_NEWLIB_NANO_NANO_MALLOC=y
 CT_LIBC_NEWLIB_NANO_NANO_FORMATTED_IO=y
+
+CT_COMP_LIBS_PICOLIBC=y
+CT_LIBC_PICOLIBC_GLOBAL_ATEXIT=y
+CT_LIBC_PICOLIBC_EXTRA_SECTIONS=y
+CT_TARGET_CFLAGS="-ftls-model=local-exec"

configs/arm64.config

@@ -69,3 +69,8 @@ CT_LIBC_NEWLIB_NANO_ENABLE_TARGET_OPTSPACE=y
 # CT_LIBC_NEWLIB_NANO_LTO is not set
 CT_LIBC_NEWLIB_NANO_NANO_MALLOC=y
 CT_LIBC_NEWLIB_NANO_NANO_FORMATTED_IO=y
+
+CT_COMP_LIBS_PICOLIBC=y
+CT_LIBC_PICOLIBC_GLOBAL_ATEXIT=y
+CT_LIBC_PICOLIBC_EXTRA_SECTIONS=y
+CT_TARGET_CFLAGS="-ftls-model=local-exec"

configs/i586.config

@@ -69,3 +69,7 @@ CT_LIBC_NEWLIB_NANO_ENABLE_TARGET_OPTSPACE=y
 # CT_LIBC_NEWLIB_NANO_LTO is not set
 CT_LIBC_NEWLIB_NANO_NANO_MALLOC=y
 CT_LIBC_NEWLIB_NANO_NANO_FORMATTED_IO=y
+
+CT_COMP_LIBS_PICOLIBC=y
+CT_LIBC_PICOLIBC_GLOBAL_ATEXIT=y
+CT_LIBC_PICOLIBC_EXTRA_SECTIONS=y

configs/riscv64.config

@@ -70,3 +70,8 @@ CT_LIBC_NEWLIB_NANO_ENABLE_TARGET_OPTSPACE=y
 # CT_LIBC_NEWLIB_NANO_LTO is not set
 CT_LIBC_NEWLIB_NANO_NANO_MALLOC=y
 CT_LIBC_NEWLIB_NANO_NANO_FORMATTED_IO=y
+
+CT_COMP_LIBS_PICOLIBC=y
+CT_LIBC_PICOLIBC_GLOBAL_ATEXIT=y
+CT_LIBC_PICOLIBC_EXTRA_SECTIONS=y
+CT_TARGET_CFLAGS="-ftls-model=local-exec"

go.sh

@@ -175,6 +175,12 @@ for t in ${TARGETS}; do
 	fi
 	rm -rf ${CT_PREFIX}/*/newlib-nano
 
+	# Fix include_next in c++ headers.  Crosstool-ng does this for
+	# known GCC releases, but we're cherry-picking a specific GCC
+	# tag, so none of the crosstool-ng patches get applied.
+
+	find ${OUTPUT_DIR}/${TARGET_DIR}/include/c++ -type f | xargs sed -i 's/include_next/include/'
+
 	popd
 	rm -fr ${TARGET_BUILD_DIR}
 	mv ${CT_PREFIX}/${TRIPLET}/build.log.bz2 ${OUTPUT_DIR}/build.${t}.${os}.${machine}.log.bz2