Squashed commit of the following:

cosmetic

    import/:  Add Makefile.symtab which can be used to compile the dynamically created symbol table C file.

    Add tools/mksymtab.sh

examples/README.txt

@@ -1468,10 +1468,12 @@ examples/posix_spawn
     CONFIG_BINFMT_DISABLE=n                   - Don't disable the binary loader
     CONFIG_ELF=y                              - Enable ELF binary loader
     CONFIG_LIBC_EXECFUNCS=y                   - Enable support for posix_spawn
-    CONFIG_EXECFUNCS_SYMTAB="g_spawn_exports" - The name of the symbol table
+    CONFIG_EXECFUNCS_SYMTAB_ARRAY="g_spawn_exports"
+                                              - The name of the symbol table
                                                 created by the test.
-    CONFIG_EXECFUNCS_NSYMBOLS=10              - Value does not matter, it will be
-                                                corrected at runtime.
+    CONFIG_EXECFUNCS_NSYMBOLS_VAR="g_spawn_nexports"
+                                              - Name of variable holding the
+                                                number of symbols
     CONFIG_POSIX_SPAWN_STACKSIZE=768          - This default setting.
 
   Test-specific configuration options:

fsutils/mkfatfs/Makefile

@@ -39,34 +39,34 @@ include $(APPDIR)/Make.defs
 
 # mkfatfs utility
 
-ASRCS		=
-CSRCS		=
+ASRCS =
+CSRCS =
 
 ifeq ($(CONFIG_FSUTILS_MKFATFS),y)
-CSRCS		= mkfatfs.c configfat.c writefat.c
+CSRCS = mkfatfs.c configfat.c writefat.c
 endif
 
-AOBJS		= $(ASRCS:.S=$(OBJEXT))
-COBJS		= $(CSRCS:.c=$(OBJEXT))
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+COBJS = $(CSRCS:.c=$(OBJEXT))
 
-SRCS		= $(ASRCS) $(CSRCS)
-OBJS		= $(AOBJS) $(COBJS)
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
 
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
-  BIN		= ..\..\libapps$(LIBEXT)
+  BIN = ..\..\libapps$(LIBEXT)
 else
 ifeq ($(WINTOOL),y)
-  BIN		= ..\\..\\libapps$(LIBEXT)
+  BIN = ..\\..\\libapps$(LIBEXT)
 else
-  BIN		= ../../libapps$(LIBEXT)
+  BIN = ../../libapps$(LIBEXT)
 endif
 endif
 
-ROOTDEPPATH	= --dep-path .
+ROOTDEPPATH = --dep-path .
 
 # Common build
 
-VPATH		=
+VPATH =
 
 all: .built
 .PHONY: context depend clean distclean preconfig

import/.gitignore

@@ -1,4 +1,7 @@
 /.config
+/System.map
+/User.map
+/symtab.c
 /arch
 /build
 /libs

import/Makefile

@@ -1,7 +1,7 @@
 ############################################################################
 # apps/import/Makefile
 #
-#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Copyright (C) 2014, 2018 Gregory Nutt. All rights reserved.
 #   Author: Gregory Nutt <gnutt@nuttx.org>
 #
 # Redistribution and use in source and binary forms, with or without
@@ -39,25 +39,39 @@
 # Sub-directories from the NuttX export package
 
 SUBDIRS = arch build include libs startup tmp
-FILES   = .config
+FILES   = .config System.map User.map
 
-all: nothing
-.PHONY: nothing context depend clean distclean
+
+define MKSYMTAB
+ifeq (,$(wildcard ./symtab.c))
+	$(Q) $(MAKE) -f Makefile.symtab $1
+endif
+endef
+
+all: symtab
+.PHONY: context depend clean distclean
 .PRECIOUS: ../libapps$(LIBEXT)
 
-nothing:
+symtab:
+	$(call MKSYMTAB, all)
 
 install:
+	$(call MKSYMTAB, install)
 
 context:
+	$(call MKSYMTAB, context)
 
 depend:
+	$(call MKSYMTAB, depend)
 
 clean:
+	$(call MKSYMTAB, clean)
 
 distclean:
 	$(foreach SDIR, $(SUBDIRS), $(call DELDIR, $(SDIR)))
 	$(foreach FILE, $(FILES), $(call DELFILE, $(FILE)))
+	$(call MKSYMTAB, distclean)
+	$(call DELFILE, symtab.c)
 
 # Library path
 

import/Makefile.symtab

@@ -0,0 +1,40 @@
+############################################################################
+# apps/import/Makefile.symtab
+#
+#   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+CSRCS = symtab.c
+
+include $(APPDIR)/Application.mk

tools/mksymtab.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+############################################################################
+# apps/tools/mksymtab.sh
+#
+#   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+usage="Usage: $0 <imagedirpath> <outfilepath>"
+
+# Make sure we understand where we are
+
+if [ ! -f tools/mksymtab.sh ]; then
+  cd .. || { echo "ERROR: cd .. failed"; exit 1; }
+  if [ ! -f tools/mksymtab.sh ]; then
+    error "This script must be executed from the top-level apps/ directory"
+    exit 1
+  fi
+fi
+
+# Check for the required directory path
+
+dir=$1
+if [ -z "$dir" ]; then
+  echo "ERROR: Missing <imagedirpath>"
+  echo ""
+  echo $usage
+  exit 1
+fi
+
+if [ ! -d "$dir" ]; then
+  echo "ERROR: Directory $dir does not exist"
+  echo ""
+  echo $usage
+  exit 1
+fi
+
+# Get the output file name
+
+outfile=$2
+if [ -z "$outfile" ]; then
+  echo "ERROR: Missing <outfilepath>"
+  echo ""
+  echo $usage
+  exit 1
+fi
+
+rm -f $outfile
+
+# Extract all of the undefined symbols from the ELF files and create a
+# list of sorted, unique undefined variable names.
+
+varlist=`find ${dir} -executable -type f | xargs nm | fgrep ' U ' | sed -e "s/^[ ]*//g" | cut -d' ' -f2 | sort | uniq`
+
+# Now output the symbol table as a structure in a C source file.  All
+# undefined symbols are declared as void* types.  If the toolchain does
+# any kind of checking for function vs. data objects, then this could
+# faile
+
+echo "#include <nuttx/compiler.h>" >$outfile
+echo "#include <nuttx/binfmt/symtab.h>" >>$outfile
+echo "" >>$outfile
+
+for var in $varlist; do
+  echo "extern void *${var};" >>$outfile
+done
+
+echo "" >>$outfile
+echo "const struct symtab_s g_symtab[] = " >>$outfile
+echo "{" >>$outfile
+
+for var in $varlist; do
+  echo "  {\"${var}\", &${var}}," >>$outfile
+done
+
+echo "};" >>$outfile
+echo "" >>$outfile
+echo "const int g_nsymbols = sizeof(g_symtab) / sizeof(struct symtab_s);" >>$outfile