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CMake: Add support for replacement getopt_long (lib/getopt*).

Thanks to Jia Tan for the initial work. I added the libgnu target
and made a few related minor edits.
This commit is contained in:
Lasse Collin 2023-09-12 22:16:56 +03:00
parent e3288fdb45
commit af66cd5859

View file

@ -10,7 +10,6 @@
# On some platforms this builds also xz and xzdec, but these are
# highly experimental and meant for testing only:
# - No large file support on those 32-bit platforms that need it
# - No replacement getopt_long(), libc must have it
# - No sandboxing support
# - No translations
#
@ -984,18 +983,59 @@ install(FILES "${CMAKE_CURRENT_BINARY_DIR}/liblzma-config.cmake"
#############################################################################
# getopt_long
# libgnu (getopt_long)
#############################################################################
# The command line tools needs this.
# This mirrors how the Autotools build system handles the getopt_long
# replacement, calling the object library libgnu since the replacement
# version comes from Gnulib.
add_library(libgnu OBJECT)
# CMake requires that even an object library must have at least once source
# file. So we give it a header file that results in no output files.
target_sources(libgnu PRIVATE lib/getopt.in.h)
# Create /lib directory in the build directory and add it to the include path.
file(MAKE_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/lib")
target_include_directories(libgnu PUBLIC "${CMAKE_CURRENT_BINARY_DIR}/lib")
# The command line tools need getopt_long in order to parse arguments. If
# the system does not have a getopt_long implementation we can use the one
# from Gnulib instead.
check_symbol_exists(getopt_long getopt.h HAVE_GETOPT_LONG)
if(NOT HAVE_GETOPT_LONG)
# Set the __GETOPT_PREFIX definition to "rpl_" (replacement) to avoid
# name conflicts with libc symbols. The same prefix is set if using
# the Autotools build (m4/getopt.m4).
target_compile_definitions(libgnu PUBLIC "__GETOPT_PREFIX=rpl_")
# Create a custom copy command to copy the getopt header to the build
# directory and re-copy it if it is updated. (Gnulib does it this way
# because it allows choosing which .in.h files to actually use in the
# build. We need just getopt.h so this is a bit overcomplicated for
# a single header file only.)
add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/lib/getopt.h"
COMMAND "${CMAKE_COMMAND}" -E copy
"${CMAKE_CURRENT_SOURCE_DIR}/lib/getopt.in.h"
"${CMAKE_CURRENT_BINARY_DIR}/lib/getopt.h"
MAIN_DEPENDENCY "${CMAKE_CURRENT_SOURCE_DIR}/lib/getopt.in.h"
VERBATIM)
target_sources(libgnu PRIVATE
lib/getopt1.c
lib/getopt.c
lib/getopt_int.h
"${CMAKE_CURRENT_BINARY_DIR}/lib/getopt.h"
)
endif()
#############################################################################
# xzdec
#############################################################################
if(HAVE_GETOPT_LONG AND HAVE_DECODERS)
if(HAVE_DECODERS)
add_executable(xzdec
src/common/sysdefs.h
src/common/tuklib_common.h
@ -1013,7 +1053,7 @@ if(HAVE_GETOPT_LONG AND HAVE_DECODERS)
src/liblzma/api
)
target_link_libraries(xzdec PRIVATE liblzma)
target_link_libraries(xzdec PRIVATE liblzma libgnu)
if(WIN32)
# Add the Windows resource file for xzdec.exe.
@ -1041,7 +1081,7 @@ endif()
# xz
#############################################################################
if(NOT MSVC AND HAVE_GETOPT_LONG)
if(NOT MSVC)
add_executable(xz
src/common/mythread.h
src/common/sysdefs.h
@ -1095,7 +1135,7 @@ if(NOT MSVC AND HAVE_GETOPT_LONG)
)
endif()
target_link_libraries(xz PRIVATE liblzma)
target_link_libraries(xz PRIVATE liblzma libgnu)
target_compile_definitions(xz PRIVATE ASSUME_RAM=128)