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libs/libc: Generate the system symbol tables in the CMake build.

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With CONFIG_EXECFUNCS_SYSTEM_SYMTAB, the make build generates
exec_symtab.c from libc.csv, libm.csv and syscall.csv with the host
tool mksymtab.  CONFIG_LIBC_ELF_SYSTEM_SYMTAB does the same for
elf_sys_symtab.c.  The CMake build did neither, so a CMake configuration
with one of these options did not link:

  binfmt_execsymtab.c: undefined reference to `g_symtab'

Do the same in libs/libc/CMakeLists.txt: build mksymtab as a host tool,
sort the three lists by name, generate the table with the configured
array and count names, and add it to the C library.  mksymtab runs in
the build directory with relative names, so the output is the same as
from the make build.

Assisted-by: Claude Code:claude-opus-5-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>
This commit is contained in:
Marco Casaroli 2026-10-07 16:37:07 +02:00 • committed by Alan C. Assis
parent f565c81c3b
commit 8ed7f00450
1 changed files with 39 additions and 0 deletions
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39
libs/libc/CMakeLists.txt
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@ -24,3 +24,42 @@ nuttx_add_kernel_library(c SPLIT)
nuttx_add_subdirectory()
target_include_directories(c PRIVATE ${CMAKE_CURRENT_LIST_DIR})
# Generate the system symbol tables from the C library, math library and system
# call lists, as libs/libc/Makefile does. The lists are sorted by name.
if(CONFIG_EXECFUNCS_SYSTEM_SYMTAB OR CONFIG_LIBC_ELF_SYSTEM_SYMTAB)
nuttx_build_host_target(mksymtab ${NUTTX_DIR}/tools/mksymtab.c)
set(SYMTAB_CSVS
${CMAKE_CURRENT_LIST_DIR}/libc.csv ${NUTTX_DIR}/libs/libm/libm.csv
${NUTTX_DIR}/syscall/syscall.csv)
set(SYMTAB_CSV ${CMAKE_CURRENT_BINARY_DIR}/system_symtab.csv)
add_custom_command(
OUTPUT ${SYMTAB_CSV}
COMMAND cat ${SYMTAB_CSVS} | LC_ALL=C sort > ${SYMTAB_CSV}
DEPENDS ${SYMTAB_CSVS})
if(CONFIG_EXECFUNCS_SYSTEM_SYMTAB)
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/exec_symtab.c
COMMAND
${NUTTX_BINARY_DIR}/bin_host/mksymtab system_symtab.csv exec_symtab.c
${CONFIG_EXECFUNCS_SYMTAB_ARRAY} ${CONFIG_EXECFUNCS_NSYMBOLS_VAR}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
DEPENDS mksymtab ${SYMTAB_CSV})
target_sources(c PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/exec_symtab.c)
endif()
if(CONFIG_LIBC_ELF_SYSTEM_SYMTAB)
add_custom_command(
OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/elf_sys_symtab.c
COMMAND
${NUTTX_BINARY_DIR}/bin_host/mksymtab system_symtab.csv elf_sys_symtab.c
${CONFIG_LIBC_ELF_SYMTAB_ARRAY} ${CONFIG_LIBC_ELF_NSYMBOLS_VAR}
WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
DEPENDS mksymtab ${SYMTAB_CSV})
target_sources(c PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/elf_sys_symtab.c)
endif()
endif()