CMakeLists：用新行创建字符串

问题描述

我在尝试在 CMakeLists.txt 中打印带有新行的字符串时遇到问题。

预期输出：

{file}:{line}:{column}
  Message: {message}
    Check: CWE-{cwe}
     Type: {severity} -> {id}
     Line: {line}:{column}
    Stack: {callstack}
{code}

如果我尝试放置换行符 (\n)，则会返回错误：

set(CPPCHECK_TEMPLATE "")
string(APPEND CPPCHECK_TEMPLATE "{file}:{line}:{column}\n")
string(APPEND CPPCHECK_TEMPLATE "  Message: {message}\n")
string(APPEND CPPCHECK_TEMPLATE "    Check: CWE-{cwe}\n")
string(APPEND CPPCHECK_TEMPLATE "     Type: {severity} -> {id}\n")
string(APPEND CPPCHECK_TEMPLATE "     Line: {line}:{column}\n")
string(APPEND CPPCHECK_TEMPLATE "    Stack: {callstack}\n")
string(APPEND CPPCHECK_TEMPLATE "{code}\n")

实施：

add_custom_command(
        COMMENT "Scanning: CPP Check\n"
        TARGET ${PROJECT_NAME}
        PRE_BUILD
        COMMAND cppcheck
        "--template=${CPPCHECK_TEMPLATE}"
        VERBATIM
)

错误：

/home/wolf/.local/share/JetBrains/ToolBox/apps/CLion/ch-0/211.7142.21/bin/cmake/linux/bin/cmake --build /home/wolf/workspace/projects/bose-connect-app-linux/src/cmake-build-debug --target clean -- -j 6
CMakeFiles/bose-connect-app-linux.dir/build.make:157: *** target pattern contains no '%'.  Stop.
make[1]: *** [CMakeFiles/Makefile2:113: CMakeFiles/bose-connect-app-linux.dir/clean] Error 2
make: *** [Makefile:109: clean] Error 2

解决方法

我尝试了很多可能性，但没有得到任何解决方案。我发现如果反斜杠 \ 被转义，那么它会识别新行 (\\n)：

set(CPPCHECK_TEMPLATE "")
string(APPEND CPPCHECK_TEMPLATE "{file}:{line}:{column}\\n")
string(APPEND CPPCHECK_TEMPLATE "  Message: {message}\\n")
string(APPEND CPPCHECK_TEMPLATE "    Check: CWE-{cwe}\\n")
string(APPEND CPPCHECK_TEMPLATE "     Type: {severity} -> {id}\\n")
string(APPEND CPPCHECK_TEMPLATE "     Line: {line}:{column}\\n")
string(APPEND CPPCHECK_TEMPLATE "    Stack: {callstack}\\n")
string(APPEND CPPCHECK_TEMPLATE "{code}\\n")

此外，它适用于 CMakeLists.txt 中的任何字符串，例如注释 (COMMENT "Scanning: CPP Check\n\n")：

add_custom_command(
        COMMENT "Scanning: CPP Check\n\n"
        TARGET ${PROJECT_NAME}
        PRE_BUILD
        COMMAND cppcheck
        "--language=c"
        "--std=c11"
        "--platform=unix64"
        "--template=${CPPCHECK_TEMPLATE}"
        "--project=${CMAKE_BINARY_DIR}/compile_commands.json"
        "--error-exitcode=1"
        VERBATIM)

注释中没有新行的输出：

Scanning: CPP Check
Checking /home/wolf/workspace/projects/bose-connect-app-linux/src/main.c ...

注释中带有新行的输出：

Scanning: CPP Check

Checking /home/wolf/workspace/projects/bose-connect-app-linux/src/main.c ...