cmake build protobuf error: NMAKE : fatal error U1073: don't know how to make 'PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND'

Question

这是我的项目树：

proto-build
     |—— build/           #empty, used for cmake building
     |—— include/
           |—— google/      #protobuf headers
     |—— lib/
           |—— libprotobuf-lite.lib
     |—— proto/
           |—— test.proto
     |—— CMakeLists.txt

这是 CMakeLists.txt:

cmake_minimum_required(VERSION 3.5)

set(CMAKE_VERBOSE_MAKEFILE ON)

SET(ROOT_PATH ".")
SET(PROTO_DIR ${ROOT_PATH}/proto)
SET(PROTOBUF_LIBRARY ${ROOT_PATH}/lib)
SET(PROTOBUF_INCLUDE_DIR ${ROOT_PATH}/include)


find_package(Protobuf REQUIRED)
protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${PROTO_DIR}/test.proto)
add_library(foo ${PROTO_SRCS} ${PROTO_HDRS})
target_link_libraries(foo ${PROTOBUF_LIBRARIES})

然后我打开cmd并定位到proto-build/build/, 运行 command:

cmake -G"NMake Makefiles" -DCMAKE_BUILD_TYPE=Release ..

它工作正常。然后运行命令：

nmake

发生错误：

NMAKE : fatal error U1073: don't know how to make 'E:\Source\proto-build\PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND'
Stop.
NMAKE : fatal error U1077: '"D:\Program_Filesx86\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"D:\Program_Filesx86\Microsoft Visual Studio 14.0\VC\BIN\amd64\nmake.exe"' : return code '0x2'
Stop.

Answer 1

未找到 Protobuf 可执行文件。这个错误的路径 E:\Source\proto-build\PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND 被写入 Makefile 并且这个错误出来了。

Answer 2

感谢 usr1234567 的建议，我已经弄明白了，这是新的 CMakeLists.txt:

cmake_minimum_required(VERSION 3.5)

set(CMAKE_VERBOSE_MAKEFILE ON)

SET(ROOT_PATH ".")
SET(PROTO_DIR ${ROOT_PATH}/proto)


#must define these tow variables:PROTOBUF_INCLUDE_DIR & PROTOBUF_LIBRARY, even the value is invalid. 
SET(PROTOBUF_INCLUDE_DIR .) 
SET(PROTOBUF_LIBRARY .) 

SET(PROTOBUF_PROTOC_EXECUTABLE ../protoc.exe)

#in this directory, contains protobuf includes: top directory is <google>
SET(THIRD_INCLUDE_DIR ${ROOT_PATH}/include)

#if set PROTOBUF_INCLUDE_DIR to the directory of protobuf includes instead of using include_directories, errors occurred when nmake,I don't know why
include_directories(${THIRD_INCLUDE_DIR})

file(GLOB PROTO_LIST ${PROTO_DIR}/*.proto)

find_package(Protobuf REQUIRED)
protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${PROTO_LIST})
add_library(foo ${PROTO_SRCS} ${PROTO_HDRS})
target_link_libraries(foo)

用这个CMakeLists.txt来camke和nmake，编译成功。有几个细节需要注意，我在CMakeLists.txt.

有一个奇怪的问题：你必须在 directory:one 中放置两个 protoc.exe 文件，一个在 proto-build/ 中，一个不在 proto- build/, 否则会报错: not found protoc.exe.

cmake build protobuf error: NMAKE : fatal error U1073: don't know how to make 'PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND'

cmake build protobuf error: NMAKE : fatal error U1073: don't know how to make 'PROTOBUF_PROTOC_EXECUTABLE-NOTFOUND'

cmake

protocol-buffers