You didn't specify -flto in your linker command line. Add that and try again.
https://gcc.gnu.org/wiki/LinkTimeOptimization ------------------ Best regards, lh_mouse 2015-05-21 ------------------------------------------------------------- 发件人：Etienne Sandré-Chardonnal <etienne.san...@m4x.org> 发送日期：2015-05-21 15:24 收件人：mingw-w64-public 抄送： 主题：Re: [Mingw-w64-public] Multiple definition issue with -flto, MinGW-w64 4.9.1 The gcc version is in the title (4.9.1), it is an official MinGW-w64 posix-seh build The command line is like this (I have stripped several -D and -I command line options, otherwise it is intact) *Compiler:* g++ -c -pipe -fno-keep-inline-dllexport -O3 -Wformat-nonliteral -std=gnu++11 -mfpmath=sse -march=corei7-avx -mtune=corei7-avx -msse4 -mavx -ftree-vectorize -fno-math-errno -funsafe-math-optimizations -fno-trapping-math -fno-exceptions *-flto *-frtti -Wall -Wextra -fexceptions -mthreads -o release\appparameters.o ..\..\ocean\source\appparameters.cpp *Linker* g++ -Wl,-s -Wl,-s -Wl,-subsystem,console -mthreads -o release\myapp.exe object_script.myapp.Release -lglu32 -lopengl32 -lgdi32 -luser32 -lIlmImf -lHalf -lIlmThread -lIex -lImath -lz -ldbghelp -lslapi -LD:/Qt/Desktop/Qt/5.4.1/lib -lQt5Widgets -lQt5Gui -lQt5Network -lQt5Xml -lQt5Concurrent -lQt5Core release\myapp_res.o The script file only contains all the .o Everything compiles & link fine without -flto What g++ version were you using? What were the exact command lines you used to build your program? > > ------------------ > Best regards, > lh_mouse > 2015-05-21 > > ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Mingw-w64-public mailing list Mingw-w64-public@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
