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nuttx/libs/libc/Makefile
Karel Kočí 9f4b4faf47 libs/libc: add limits checks 
NuttX defines constants for the sizes of types just as constants
directly in the code. The real values depend on compiler and target
platform. It is possible that value declared by NuttX header is wrong
compared to the compiler configuration. This is more likely in case of
floating points.

Not all compilers supported by NuttX provide required info through
defines and thus it is more generic to specify limits as constants, but
in case compiler provides them then it is a good idea to compare. This
commit adds such set of comparisons for limits.h and float.h constants.

The comparisons were tested with GCC and Clang. They will be ignored in
case compiler doesn't provide them.

Signed-off-by: Karel Kočí <kkoci@elektroline.cz>
2026-07-02 09:02:21 -03:00

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Makefile
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############################################################################
# libs/libc/Makefile
#
# SPDX-License-Identifier: Apache-2.0
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership. The
# ASF licenses this file to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance with the
# License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
###########################################################################
include $(TOPDIR)/Make.defs
include aio/Make.defs
include assert/Make.defs
include audio/Make.defs
include builtin/Make.defs
include ctype/Make.defs
include dirent/Make.defs
include dlfcn/Make.defs
include errno/Make.defs
include eventfd/Make.defs
include fixedmath/Make.defs
include gdbstub/Make.defs
include grp/Make.defs
include gnssutils/Make.defs
include hex2bin/Make.defs
include inttypes/Make.defs
include libgen/Make.defs
include locale/Make.defs
include lzf/Make.defs
include machine/Make.defs
include misc/Make.defs
include elf/Make.defs
include net/Make.defs
include netdb/Make.defs
include obstack/Make.defs
include pthread/Make.defs
include pwd/Make.defs
include queue/Make.defs
include regex/Make.defs
include sched/Make.defs
include search/Make.defs
include semaphore/Make.defs
include signal/Make.defs
include spawn/Make.defs
include stdio/Make.defs
include stdlib/Make.defs
include stream/Make.defs
include string/Make.defs
include symtab/Make.defs
include syslog/Make.defs
include termios/Make.defs
include time/Make.defs
include tls/Make.defs
include uio/Make.defs
include unistd/Make.defs
include userfs/Make.defs
include uuid/Make.defs
include wchar/Make.defs
include wctype/Make.defs
include wqueue/Make.defs
include fdt/Make.defs
CSRCS += limits_check.c
# Use double delim to fix windows native build and give an error:
# makefile:132: *** target mode do not include“%”. stop.
#
# In Windows environment DELIM := $(strip \) but \ has two role:
# first: \ as directory, and second \ as Escape character, Reference:
#
# https://github.com/apache/nuttx/pull/7572#discussion_r1028219229
ifeq ($(CONFIG_WINDOWS_NATIVE),y)
DELIMS = $(DELIM)$(DELIM)
else
DELIMS = $(DELIM)
endif
CFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libc
AFLAGS += ${INCDIR_PREFIX}$(TOPDIR)$(DELIM)libs$(DELIM)libc
# Rule for the symbol table generation
MKSYMTAB = $(TOPDIR)$(DELIM)tools$(DELIM)mksymtab$(HOSTEXEEXT)
$(MKSYMTAB):
$(Q) $(MAKE) -C $(TOPDIR)$(DELIM)tools -f Makefile.host mksymtab
# C library and math library symbols should be available in the FLAT
# and PROTECTED builds. KERNEL builds are separately linked and so should
# not need symbol tables.
CSVFILES = $(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)libc.csv
CSVFILES += $(TOPDIR)$(DELIM)libs$(DELIM)libm$(DELIM)libm.csv
# In the PROTECTED and KERNEL builds, the applications could link with
# libproxy which will provide symbol-compatible access to OS functions
# via a call gate, but the applications which link with these functions
# directly could remove the repeat proxy code to save the space.
CSVFILES += $(TOPDIR)$(DELIM)syscall$(DELIM)syscall.csv
ifeq ($(CONFIG_EXECFUNCS_SYSTEM_SYMTAB),y)
exec_symtab.c : $(CSVFILES) $(MKSYMTAB)
$(Q) cat $(CSVFILES) | LC_ALL=C sort >$@.csv
$(Q) $(MKSYMTAB) $@.csv $@ $(CONFIG_EXECFUNCS_SYMTAB_ARRAY) $(CONFIG_EXECFUNCS_NSYMBOLS_VAR)
$(Q) rm -f $@.csv
CSRCS += exec_symtab.c
endif
ifeq ($(CONFIG_LIBC_ELF_SYSTEM_SYMTAB),y)
elf_sys_symtab.c : $(CSVFILES) $(MKSYMTAB)
$(Q) cat $(CSVFILES) | LC_ALL=C sort >$@.csv
$(Q) $(MKSYMTAB) $@.csv $@ $(CONFIG_LIBC_ELF_SYMTAB_ARRAY) $(CONFIG_LIBC_ELF_NSYMBOLS_VAR)
$(Q) rm -f $@.csv
CSRCS += elf_sys_symtab.c
endif
BINDIR ?= bin
AOBJS = $(patsubst %.S, $(BINDIR)$(DELIMS)%$(OBJEXT), $(ASRCS))
COBJS = $(patsubst %.c, $(BINDIR)$(DELIMS)%$(OBJEXT), $(CSRCS))
SRCS = $(ASRCS) $(CSRCS)
OBJS = $(AOBJS) $(COBJS)
KBIN = libkc$(LIBEXT)
BIN ?= libc$(LIBEXT)
all: $(BIN)
.PHONY: clean distclean
$(AOBJS): $(BINDIR)$(DELIMS)%$(OBJEXT): %.S
$(call ASSEMBLE, $<, $@)
# REVISIT: Backslash causes problems in $(COBJS) target
$(COBJS): $(BINDIR)$(DELIMS)%$(OBJEXT): %.c
$(call COMPILE, $<, $@)
# C library for the flat build and
# the user phase of the two-pass kernel build
$(BIN): $(OBJS)
$(call ARCHIVE, $@, $(OBJS))
ifeq ($(CONFIG_LIBC_ZONEINFO_ROMFS),y)
$(Q) $(MAKE) -C zoneinfo all BIN=$(BIN)
endif
# C library for the kernel phase of the two-pass kernel build
ifneq ($(BIN),$(KBIN))
$(KBIN): $(OBJS)
$(Q) $(MAKE) $(KBIN) BIN=$(KBIN) EXTRAFLAGS="$(EXTRAFLAGS)"
endif
# Context
bin:
$(Q) mkdir $@
kbin:
$(Q) mkdir $@
context:: bin kbin
ifeq ($(CONFIG_LIBC_ZONEINFO_ROMFS),y)
$(Q) $(MAKE) -C zoneinfo context BIN=$(BIN)
endif
ifeq ($(CONFIG_LIBC_ELF),y)
$(Q) $(MAKE) -C elf context
endif
# Dependencies
makedepfile: $(CSRCS:.c=.ddc) $(ASRCS:.S=.dds)
$(call CATFILE, bin/Make.dep, $^)
$(call DELFILE, $^)
makekdepfile: $(CSRCS:.c=.ddc) $(ASRCS:.S=.dds)
$(call CATFILE, kbin/Make.dep, $^)
$(call DELFILE, $^)
.depend: Makefile $(SRCS) $(TOPDIR)$(DELIM).config
$(Q) $(MAKE) makedepfile OBJPATH="bin"
ifneq ($(CONFIG_BUILD_FLAT),y)
$(Q) $(MAKE) makekdepfile CFLAGS="$(CFLAGS) $(KDEFINE)" OBJPATH="kbin"
endif
ifeq ($(CONFIG_LIBC_ZONEINFO_ROMFS),y)
$(Q) $(MAKE) -C zoneinfo depend BIN=$(BIN)
endif
$(Q) touch $@
depend:: .depend
# Clean most derived files, retaining the configuration
clean::
$(Q) $(MAKE) -C zoneinfo clean BIN=$(BIN)
$(Q) $(MAKE) -C elf clean
$(call DELFILE, $(BIN))
$(call DELFILE, $(KBIN))
$(call CLEAN)
# Deep clean -- removes all traces of the configuration
distclean:: clean
$(Q) $(MAKE) -C zoneinfo distclean BIN=$(BIN)
$(Q) $(MAKE) -C elf distclean
$(call DELFILE, exec_symtab.c)
$(call DELFILE, $(CSRCS:.c=.ddc) $(ASRCS:.S=.dds))
$(call DELFILE, .depend)
$(call DELDIR, bin)
$(call DELDIR, kbin)
-include bin$(DELIM)Make.dep
-include kbin$(DELIM)Make.dep
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