Introduce "Dev mode" option

When the option is On, CMake will have rules to generate the generated
files using scripts etc. When the option is Off, CMake will assume the
files are available from the source tree; in that mode, it won't require
any extra tools (Perl for example) compared to when we committed the
files to git.

The intention is that users will never need to adjust this option:

- in the development branch (and features branches etc.) the option is
always On (development mode);
- in released tarballs, which include the generated files, we'll switch
the option to Off (release mode) in the same commit that re-adds the
generated files.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>

CMakeLists.txt

@@ -46,6 +46,7 @@ option(ENABLE_PROGRAMS "Build mbed TLS programs." ON)
 
 option(UNSAFE_BUILD "Allow unsafe builds. These builds ARE NOT SECURE." OFF)
 option(MBEDTLS_FATAL_WARNINGS "Compiler warnings treated as errors" ON)
+option(DEV_MODE "Development mode: (re)generate some files as needed" ON)
 
 string(REGEX MATCH "Clang" CMAKE_COMPILER_IS_CLANG "${CMAKE_C_COMPILER_ID}")
 string(REGEX MATCH "GNU" CMAKE_COMPILER_IS_GNU "${CMAKE_C_COMPILER_ID}")

library/CMakeLists.txt

@@ -109,10 +109,11 @@ set(src_tls
     ssl_tls13_generic.c
 )
 
-find_package(Perl REQUIRED)
+if(DEV_MODE)
+    find_package(Perl REQUIRED)
 
-file(GLOB error_headers ${CMAKE_CURRENT_SOURCE_DIR}/../include/mbedtls/*.h)
-add_custom_command(
+    file(GLOB error_headers ${CMAKE_CURRENT_SOURCE_DIR}/../include/mbedtls/*.h)
+    add_custom_command(
         OUTPUT
             ${CMAKE_CURRENT_BINARY_DIR}/error.c
         COMMAND
@@ -125,9 +126,9 @@ add_custom_command(
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/generate_errors.pl
             ${error_headers}
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/data_files/error.fmt
-)
+    )
 
-add_custom_command(
+    add_custom_command(
         OUTPUT
             ${CMAKE_CURRENT_BINARY_DIR}/version_features.c
         COMMAND
@@ -140,7 +141,11 @@ add_custom_command(
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/generate_features.pl
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/mbedtls/mbedtls_config.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/data_files/version_features.fmt
-)
+    )
+else()
+    link_to_source(error.c)
+    link_to_source(version_features.c)
+endif()
 
 if(CMAKE_COMPILER_IS_GNUCC)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wmissing-declarations -Wmissing-prototypes")

programs/psa/CMakeLists.txt

@@ -4,7 +4,8 @@ set(executables
     psa_constant_names
 )
 
-add_custom_command(
+if(DEV_MODE)
+    add_custom_command(
         OUTPUT
             ${CMAKE_CURRENT_BINARY_DIR}/psa_constant_names_generated.c
         COMMAND
@@ -17,7 +18,10 @@ add_custom_command(
             ${CMAKE_CURRENT_SOURCE_DIR}/../../scripts/generate_psa_constants.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../../include/psa/crypto_values.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../../include/psa/crypto_extra.h
-)
+    )
+else()
+    link_to_source(psa_constant_names_generated.c)
+endif()
 
 foreach(exe IN LISTS executables)
     add_executable(${exe} ${exe}.c $<TARGET_OBJECTS:mbedtls_test>)
@@ -26,9 +30,11 @@ foreach(exe IN LISTS executables)
 endforeach()
 
 target_include_directories(psa_constant_names PRIVATE ${CMAKE_CURRENT_BINARY_DIR})
-add_custom_target(generate_psa_constant_names_generated_c
+if(DEV_MODE)
+    add_custom_target(generate_psa_constant_names_generated_c
         DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/psa_constant_names_generated.c)
-add_dependencies(psa_constant_names generate_psa_constant_names_generated_c)
+    add_dependencies(psa_constant_names generate_psa_constant_names_generated_c)
+endif()
 
 install(TARGETS ${executables}
         DESTINATION "bin"

programs/ssl/CMakeLists.txt

@@ -18,14 +18,16 @@ set(executables
     ssl_server2
 )
 
-# Inform CMake the the following file will be generated as part of the build
-# process, so it doesn't complain that it doesn't exist yet. Starting from
-# CMake 3.20, this will no longer be necessary as CMake will automatically
-# propagate this information accross the tree, for now it's only visible
-# inside the same directory, so we need to propagate manually.
-set_source_files_properties(
+if(DEV_MODE)
+    # Inform CMake the the following file will be generated as part of the build
+    # process, so it doesn't complain that it doesn't exist yet. Starting from
+    # CMake 3.20, this will no longer be necessary as CMake will automatically
+    # propagate this information accross the tree, for now it's only visible
+    # inside the same directory, so we need to propagate manually.
+    set_source_files_properties(
         ${CMAKE_CURRENT_BINARY_DIR}/../test/query_config.c
         PROPERTIES GENERATED TRUE)
+endif()
 
 foreach(exe IN LISTS executables)
     set(extra_sources "")
@@ -40,7 +42,9 @@ foreach(exe IN LISTS executables)
     target_link_libraries(${exe} ${libs})
     target_include_directories(${exe} PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../../tests/include)
     if(exe STREQUAL "ssl_client2" OR exe STREQUAL "ssl_server2")
+        if(DEV_MODE)
             add_dependencies(${exe} generate_query_config_c)
+        endif()
         target_include_directories(${exe}
             PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/../test)
     endif()

programs/test/CMakeLists.txt

@@ -27,9 +27,10 @@ if(TEST_CPP)
     target_link_libraries(cpp_dummy_build ${mbedcrypto_target})
 endif()
 
-find_package(Perl REQUIRED)
+if(DEV_MODE)
+    find_package(Perl REQUIRED)
 
-add_custom_command(
+    add_custom_command(
         OUTPUT
             ${CMAKE_CURRENT_BINARY_DIR}/query_config.c
         COMMAND
@@ -42,11 +43,14 @@ add_custom_command(
             ${CMAKE_CURRENT_SOURCE_DIR}/../../scripts/generate_query_config.pl
             ${CMAKE_CURRENT_SOURCE_DIR}/../../include/mbedtls/mbedtls_config.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../../scripts/data_files/query_config.fmt
-)
-# this file will also be used in anoter directory, so create a target, see
-# https://gitlab.kitware.com/cmake/community/-/wikis/FAQ#how-can-i-add-a-dependency-to-a-source-file-which-is-generated-in-a-subdirectory
-add_custom_target(generate_query_config_c
+    )
+    # this file will also be used in anoter directory, so create a target, see
+    # https://gitlab.kitware.com/cmake/community/-/wikis/FAQ#how-can-i-add-a-dependency-to-a-source-file-which-is-generated-in-a-subdirectory
+    add_custom_target(generate_query_config_c
         DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/query_config.c)
+else()
+    link_to_source(query_config.c)
+endif()
 
 foreach(exe IN LISTS executables_libs executables_mbedcrypto)
     set(extra_sources "")

tests/CMakeLists.txt

@@ -16,7 +16,8 @@ endif()
 # generated .data files will go there
 file(MAKE_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/suites)
 
-add_custom_command(
+if(DEV_MODE)
+    add_custom_command(
         OUTPUT
             ${CMAKE_CURRENT_BINARY_DIR}/suites/test_suite_psa_crypto_not_supported.generated.data
             ${CMAKE_CURRENT_BINARY_DIR}/suites/test_suite_psa_crypto_storage_format.current.data
@@ -32,7 +33,12 @@ add_custom_command(
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_config.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_values.h
             ${CMAKE_CURRENT_SOURCE_DIR}/../include/psa/crypto_extra.h
-)
+    )
+else()
+    link_to_source(suites/test_suite_psa_crypto_not_supported.generated.data)
+    link_to_source(suites/test_suite_psa_crypto_storage_format.current.data)
+    link_to_source(suites/test_suite_psa_crypto_storage_format.v0.data)
+endif()
 
 # Test suites caught by SKIP_TEST_SUITES are built but not executed.
 # "foo" as a skip pattern skips "test_suite_foo" and "test_suite_foo.bar"