From 2ac39621bcb8fa205029591d3e6c67d66080e001 Mon Sep 17 00:00:00 2001 From: Alastair D'Silva Date: Fri, 23 Dec 2016 12:02:42 +1100 Subject: Add more newlib options --- config/libc/newlib.in.2 | 95 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 94 insertions(+), 1 deletion(-) (limited to 'config/libc') diff --git a/config/libc/newlib.in.2 b/config/libc/newlib.in.2 index 48e5503f..64630b03 100644 --- a/config/libc/newlib.in.2 +++ b/config/libc/newlib.in.2 @@ -26,6 +26,41 @@ config LIBC_NEWLIB_IO_LDBL help Enable support for IOs on long doubles. +config LIBC_NEWLIB_IO_POS_ARGS + bool + prompt "Enable printf-family positional arg support" + help + Enable printf-family positional arg support. + +config LIBC_NEWLIB_FVWRITE_IN_STREAMIO + bool + prompt "Vector buffer mechanism to support stream IO buffering" + default y + help + NEWLIB implements the vector buffer mechanism to support stream IO + buffering required by C standard. This feature is possibly + unnecessary for embedded systems which won't change file buffering + with functions like `setbuf' or `setvbuf'. The buffering mechanism + still acts as default for STDIN/STDOUT/STDERR even if this option + is specified. + +config LIBC_NEWLIB_UNBUF_STREAM_OPT + bool + prompt "Optimize fprintf to unbuffered unix file" + default y + help + NEWLIB does optimization when `fprintf to write only unbuffered unix + file'. It creates a temorary buffer to do the optimization that + increases stack consumption by about `BUFSIZ' bytes. Disabling this option + disables the optimization and saves size of text and stack. + +config LIBC_NEWLIB_FSEEK_OPTIMIZATION + bool + prompt "Fseek optimisation" + default y + help + Disabling fseek optimisation can decrease code size. + config LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS bool prompt "Disable the syscalls supplied with newlib" @@ -35,13 +70,71 @@ config LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS _write... If you plan to port newlib to a new platform/board, say Yes. +config LIBC_NEWLIB_REGISTER_FINI + bool + prompt "Enable finalization function registration using atexit" + help + Enable finalization function registration using atexit. + +config LIBC_NEWLIB_ATEXIT_DYNAMIC_ALLOC + bool + prompt "Enable dynamic allocation of atexit entries" + default y + help + Enable dynamic allocation of atexit entries. + +config LIBC_NEWLIB_GLOBAL_ATEXIT + bool + prompt "Enable atexit data structure as global variable" + help + Enable atexit data structure as global variable. By doing so it is + move out of _reent structure, and can be garbage collected if atexit + is not referenced. + +config LIBC_NEWLIB_LITE_EXIT + bool + prompt "Enable lite exit" + help + Enable lite exit, a size-reduced implementation of exit that doesn't + invoke clean-up functions such as _fini or global destructors. + +config LIBC_NEWLIB_REENT_SMALL + bool + prompt "Enable small reentrant struct support" + help + Enable small reentrant struct support. + +config LIBC_NEWLIB_MULTITHREAD + bool + prompt "Enable support for multiple threads" + default y + help + Enable support for multiple threads. + +config LIBC_NEWLIB_EXTRA_SECTIONS + bool + prompt "Place each function & data element in their own section" + help + Place each function & data symbol in their own section. This allows + the linker to garbage collect unused symbols at link time. + +config LIBC_NEWLIB_WIDE_ORIENT + bool + prompt "Allow wide C99 stream orientation" + default y + help + C99 states that each stream has an orientation, wide or byte. This + feature is possibly unnecessary for embedded systems which only do + byte input/output operations on stream. Disabling this feature can + decrease code size. + config LIBC_NEWLIB_ENABLE_TARGET_OPTSPACE bool prompt "Optimize newlib for size" default y help Pass --enable-target-optspace to newlib configure. - + This will compile newlib with -Os. config LIBC_NEWLIB_NANO_MALLOC -- cgit v1.2.3 From 14896a2600f99ddb86d7c100ec8e57557c013438 Mon Sep 17 00:00:00 2001 From: Alastair D'Silva Date: Sat, 24 Dec 2016 01:26:05 +1100 Subject: Support building Newlib with Link Time Optimisation Signed-off-by: Alastair D'Silva --- config/libc/newlib.in.2 | 9 +++++++++ scripts/build/libc/newlib.sh | 23 +++++++++++++---------- 2 files changed, 22 insertions(+), 10 deletions(-) (limited to 'config/libc') diff --git a/config/libc/newlib.in.2 b/config/libc/newlib.in.2 index 64630b03..927cce89 100644 --- a/config/libc/newlib.in.2 +++ b/config/libc/newlib.in.2 @@ -137,6 +137,15 @@ config LIBC_NEWLIB_ENABLE_TARGET_OPTSPACE This will compile newlib with -Os. +config LIBC_NEWLIB_LTO + bool + prompt "Enable Link Time Optimization" + help + Builds the libraries with -flto to enable more aggressive link time + optimization. You will need to add -flto-partition=one to your + application's link line to keep the RETURN assembler macro together + with it's consumers. + config LIBC_NEWLIB_NANO_MALLOC bool prompt "Enable Nano Malloc" diff --git a/scripts/build/libc/newlib.sh b/scripts/build/libc/newlib.sh index 442b92c0..0a87581e 100644 --- a/scripts/build/libc/newlib.sh +++ b/scripts/build/libc/newlib.sh @@ -116,6 +116,9 @@ ENABLE_TARGET_OPTSPACE:target-optspace [ "${CT_LIBC_NEWLIB_EXTRA_SECTIONS}" = "y" ] && \ CT_LIBC_NEWLIB_TARGET_CFLAGS="${CT_LIBC_NEWLIB_TARGET_CFLAGS} -ffunction-sections -fdata-sections" + [ "${CT_LIBC_NEWLIB_LTO}" = "y" ] && \ + CT_LIBC_NEWLIB_TARGET_CFLAGS="${CT_LIBC_NEWLIB_TARGET_CFLAGS} -flto" + [ "${CT_LIBC_NEWLIB_ENABLE_TARGET_OPTSPACE}" = "y" ] && newlib_opts+=("--enable-target-optspace") cflags_for_target="${CT_TARGET_CFLAGS} ${CT_LIBC_NEWLIB_TARGET_CFLAGS}" @@ -125,16 +128,16 @@ ENABLE_TARGET_OPTSPACE:target-optspace # build : not used # host : the machine building newlib # target : the machine newlib runs on - CT_DoExecLog CFG \ - CC_FOR_BUILD="${CT_BUILD}-gcc" \ - CFLAGS_FOR_TARGET="${cflags_for_target}" \ - AR=${CT_TARGET}-ar \ - RANLIB=${CT_TARGET}-ranlib \ - "${CT_SRC_DIR}/newlib-${CT_LIBC_VERSION}/configure" \ - --host=${CT_BUILD} \ - --target=${CT_TARGET} \ - --prefix=${CT_PREFIX_DIR} \ - "${newlib_opts[@]}" \ + CT_DoExecLog CFG \ + CC_FOR_BUILD="${CT_BUILD}-gcc" \ + CFLAGS_FOR_TARGET="${cflags_for_target}" \ + AR_FOR_TARGET="`which ${CT_TARGET}-gcc-ar`" \ + RANLIB_FOR_TARGET="`which ${CT_TARGET}-gcc-ranlib`" \ + "${CT_SRC_DIR}/newlib-${CT_LIBC_VERSION}/configure" \ + --host=${CT_BUILD} \ + --target=${CT_TARGET} \ + --prefix=${CT_PREFIX_DIR} \ + "${newlib_opts[@]}" \ "${CT_LIBC_NEWLIB_EXTRA_CONFIG_ARRAY[@]}" CT_DoLog EXTRA "Building C library" -- cgit v1.2.3