Log4cpp是一個開源的C++類庫,它提供了在C++程序中使用日誌和跟蹤調試的功能。最新版本爲1.1.3。項目地址爲:http://log4cpp.sourceforge.net/windows
該版本指供了msvc6,msvc7(2003),msvc10(2010)的編譯解決方案,其它編譯解決方案能夠從中選擇一個進行調整。函數
如下是我msvc2017環境下的編譯過程。post
一、下載並解壓獲得log4cpp源碼;ui
二、複製一份msvc10子目錄並重命名爲msvc2017;this
三、用vs2017打開msvc10.sln解決方案,會提示須要升級,點擊OK接受升級;spa
四、嘗試單獨編譯log4cpp動態庫,出現以下錯誤信息:.net
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1>------ Build started: Project: log4cpp, Configuration: Debug Win32 ------
1>Performing Custom Build Tools
1>'"vsvars32.bat"' 不是內部或外部命令,也不是可運行的程序
1>或批處理文件。
1>D:\log4cpp\msvc2017\log4cpp\..\NTEventLogCategories.mc : error : unable to open output file - Debug" -r Debug"\NTEventLogCategories.h
1>MC: Unable to open D:\log4cpp\msvc2017\log4cpp\..\NTEventLogCategories.mc for input
1>Microsoft (R) Windows (R) Resource Compiler Version 10.0.10011.16384
1>
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>
1>
1>CUSTOMBUILD : fatal error RC1110: could not open Debug\NTEventLogCategories.rc
1>
1>Microsoft (R) Incremental Linker Version 14.11.25508.2
1>Copyright (C) Microsoft Corporation. All rights reserved.
1>
1>LINK : fatal error LNK1181: cannot open input file 'Debug\NTEventLogCategories.res'
1>Done building project "log4cpp.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
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這是對「NTEventLogCategories.mc」文件編譯的報錯信息,該文件是採用「自定義編譯」方法,用mc.exe命名行編譯。調試
五、打開「NTEventLogCategories.mc」文件人編譯屬性,以下圖:日誌
六、修改Command Line。爲了好看,我作了一下換行,換行後代碼以下:code
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"$(VS100COMNTOOLS)vsvars32.bat"
if not exist $(OutDir) md $(OutDir)
mc.exe -h "$(OutDir)" -r "$(OutDir)" "$(ProjectDir)..\%(Filename).mc"
rc.exe -r -fo "$(OutDir)%(Filename).res" "$(OutDir)%(Filename).rc"
link.exe /MACHINE:IX86 -dll -noentry -out:"$(OutDir)NTEventLogAppender.dll" "$(OutDir)%(Filename).res"
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七、刪除第一行,並在第三行的"$(OutDir)"改成"$(OutDir)\"。(即在後面多加一個\號)。改完後的全文以下:
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if not exist $(OutDir) md $(OutDir)
mc.exe -h "$(OutDir)\" -r "$(OutDir)\" "$(ProjectDir)..\%(Filename).mc"
rc.exe -r -fo "$(OutDir)%(Filename).res" "$(OutDir)%(Filename).rc"
link.exe /MACHINE:IX86 -dll -noentry -out:"$(OutDir)NTEventLogAppender.dll" "$(OutDir)%(Filename).res"
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八、從新編譯,上面的問題沒了,但又出現了另外一個錯誤。錯誤信息以下:
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1>d:\log4cpp\src\snprintf.c(524): error C2084: function 'int snprintf(char *const ,const ::size_t,const char *const ,...)' already has a body
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\ucrt\stdio.h(1938): note: see previous definition of 'snprintf'
1>d:\log4cpp\src\snprintf.c(538): error C2084: function 'int vsnprintf(char *const ,const ::size_t,const char *const ,va_list)' already has a body
1>c:\program files (x86)\windows kits\10\include\10.0.15063.0\ucrt\stdio.h(1428): note: see previous definition of 'vsnprintf'
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九、根據錯誤提示定位到snprintf.c文件第524行,部份文本以下:
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/*
* If the system does have snprintf and the portable routine is not
* specifically required, this module produces no code for snprintf/vsnprintf.
*/
#if !defined(HAVE_SNPRINTF) || defined(PREFER_PORTABLE_SNPRINTF)
#if !defined(NEED_SNPRINTF_ONLY)
int
portable_snprintf(
char
*str,
size_t
str_m,
const
char
*fmt,
/*args*/
...) {
va_list
ap;
int
str_l;
va_start
(ap, fmt);
str_l = portable_vsnprintf(str, str_m, fmt, ap);
va_end
(ap);
return
str_l;
}
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十、能夠看出log4cpp對snprintf作了從新定義,但vs2017已自帶snprintf函數,因此,咱們能夠用開關「HAVE_SNPRINTF」來禁用這段代碼。
十一、從新編譯,搞定。
十二、其它工程一樣用以上方法修正。
此文轉自:http://www.jiazi.cn/blog/?id=55