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cmake: use repo-relative paths for flex/bison #line output

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Invoke flex and bison from CMAKE_SOURCE_DIR with relative input and
output paths so generated parser/lexer sources do not embed absolute
build directory paths.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Hayodea Hekol
2026-06-21 15:56:41 -04:00
parent a9de2bb1ab
commit 63ff0aa264
1 changed files with 53 additions and 36 deletions
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cmake/flexYacc.cmake
+53 -36
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@@ -1,6 +1,13 @@
# Generic Flex/Yacc Generation Functions # Generic Flex/Yacc Generation Functions
# This file provides reusable functions for generating C++ files from Flex/Bison sources # This file provides reusable functions for generating C++ files from Flex/Bison sources
# Emit #line paths relative to CMAKE_SOURCE_DIR so generated sources do not embed
# absolute build-tree paths (helps reproducible builds and Yocto QA buildpaths).
function(_flexyacc_path_relative_to_source OUT_VAR ABS_PATH)
file(RELATIVE_PATH ${OUT_VAR} ${CMAKE_SOURCE_DIR} ${ABS_PATH})
set(${OUT_VAR} ${${OUT_VAR}} PARENT_SCOPE)
endfunction()
# Function to generate Flex lexer files # Function to generate Flex lexer files
# Usage: generate_flex_lexer(OUTPUT_VAR INPUT_FILE [PREFIX] [HEADER_DEPENDENCY]) # Usage: generate_flex_lexer(OUTPUT_VAR INPUT_FILE [PREFIX] [HEADER_DEPENDENCY])
# OUTPUT_VAR: Variable name to store the output file path # OUTPUT_VAR: Variable name to store the output file path
@@ -8,31 +15,36 @@
# PREFIX: Optional prefix for the generated files (defaults to basename of input file) # PREFIX: Optional prefix for the generated files (defaults to basename of input file)
# HEADER_DEPENDENCY: Optional header file that the lexer depends on (e.g., from Bison) # HEADER_DEPENDENCY: Optional header file that the lexer depends on (e.g., from Bison)
function(generate_flex_lexer OUTPUT_VAR INPUT_FILE) function(generate_flex_lexer OUTPUT_VAR INPUT_FILE)
get_filename_component(INPUT_BASENAME ${INPUT_FILE} NAME_WE) get_filename_component(INPUT_BASENAME ${INPUT_FILE} NAME_WE)
if(ARGC GREATER 2) if(ARGC GREATER 2)
set(PREFIX ${ARGV2}) set(PREFIX ${ARGV2})
else() else()
set(PREFIX ${INPUT_BASENAME}) set(PREFIX ${INPUT_BASENAME})
endif() endif()
set(LEX_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.cc) set(LEX_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.cc)
set(LEX_HEADER ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.hh) set(LEX_HEADER ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.hh)
# Set up dependencies _flexyacc_path_relative_to_source(LEX_INPUT ${INPUT_FILE})
set(DEPENDENCIES ${INPUT_FILE}) _flexyacc_path_relative_to_source(LEX_OUTPUT_REL ${LEX_OUTPUT})
if(ARGC GREATER 3) _flexyacc_path_relative_to_source(LEX_HEADER_REL ${LEX_HEADER})
list(APPEND DEPENDENCIES ${ARGV3})
endif()
add_custom_command( # Set up dependencies
OUTPUT ${LEX_OUTPUT} set(DEPENDENCIES ${INPUT_FILE})
DEPENDS ${DEPENDENCIES} if(ARGC GREATER 3)
COMMAND ${FLEX_EXECUTABLE} --header-file=${LEX_HEADER} -o ${LEX_OUTPUT} ${INPUT_FILE} list(APPEND DEPENDENCIES ${ARGV3})
COMMENT "Generating ${PREFIX}.cc from ${INPUT_FILE}" endif()
)
set(${OUTPUT_VAR} ${LEX_OUTPUT} PARENT_SCOPE) add_custom_command(
OUTPUT ${LEX_OUTPUT}
DEPENDS ${DEPENDENCIES}
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
COMMAND ${FLEX_EXECUTABLE} --header-file=${LEX_HEADER_REL} -o ${LEX_OUTPUT_REL} ${LEX_INPUT}
COMMENT "Generating ${PREFIX}.cc from ${INPUT_FILE}"
)
set(${OUTPUT_VAR} ${LEX_OUTPUT} PARENT_SCOPE)
endfunction() endfunction()
# Function to generate Bison parser files # Function to generate Bison parser files
@@ -42,26 +54,31 @@ endfunction()
# INPUT_FILE: Path to the .yy input file # INPUT_FILE: Path to the .yy input file
# PREFIX: Optional prefix for the generated files (defaults to basename of input file) # PREFIX: Optional prefix for the generated files (defaults to basename of input file)
function(generate_bison_parser OUTPUT_VAR HEADER_VAR INPUT_FILE) function(generate_bison_parser OUTPUT_VAR HEADER_VAR INPUT_FILE)
get_filename_component(INPUT_BASENAME ${INPUT_FILE} NAME_WE) get_filename_component(INPUT_BASENAME ${INPUT_FILE} NAME_WE)
if(ARGC GREATER 3) if(ARGC GREATER 3)
set(PREFIX ${ARGV3}) set(PREFIX ${ARGV3})
else() else()
set(PREFIX ${INPUT_BASENAME}) set(PREFIX ${INPUT_BASENAME})
endif() endif()
set(YACC_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.cc) set(YACC_OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.cc)
set(YACC_HEADER ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.hh) set(YACC_HEADER ${CMAKE_CURRENT_BINARY_DIR}/${PREFIX}.hh)
add_custom_command( _flexyacc_path_relative_to_source(YACC_INPUT ${INPUT_FILE})
OUTPUT ${YACC_OUTPUT} ${YACC_HEADER} _flexyacc_path_relative_to_source(YACC_OUTPUT_REL ${YACC_OUTPUT})
DEPENDS ${INPUT_FILE} _flexyacc_path_relative_to_source(YACC_HEADER_REL ${YACC_HEADER})
COMMAND ${BISON_EXECUTABLE} -p ${PREFIX} --header=${YACC_HEADER} -o ${YACC_OUTPUT} ${INPUT_FILE}
COMMENT "Generating ${PREFIX}.cc and ${PREFIX}.hh from ${INPUT_FILE}"
)
set(${OUTPUT_VAR} ${YACC_OUTPUT} PARENT_SCOPE) add_custom_command(
set(${HEADER_VAR} ${YACC_HEADER} PARENT_SCOPE) OUTPUT ${YACC_OUTPUT} ${YACC_HEADER}
DEPENDS ${INPUT_FILE}
WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
COMMAND ${BISON_EXECUTABLE} -p ${PREFIX} --header=${YACC_HEADER_REL} -o ${YACC_OUTPUT_REL} ${YACC_INPUT}
COMMENT "Generating ${PREFIX}.cc and ${PREFIX}.hh from ${INPUT_FILE}"
)
set(${OUTPUT_VAR} ${YACC_OUTPUT} PARENT_SCOPE)
set(${HEADER_VAR} ${YACC_HEADER} PARENT_SCOPE)
endfunction() endfunction()
# Generate device attachment parser files using the generic functions # Generate device attachment parser files using the generic functions