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On 9/20/2011 17:12, Andrew Schulman wrote: > I'm trying to compile a program that calls the win32 function > SetThreadExecutionState, in kernel32.dll [1]. The link step fails: > > $ gcc -c nosleep.c > $ gcc -o nosleep nosleep.o -lkernel32 > nosleep.o:nosleep.c:(.text+0x1f): undefined reference to > `_SetThreadExecutionState' > nosleep.o:nosleep.c:(.text+0x5c): undefined reference to > `_SetThreadExecutionState' > collect2: ld returned 1 exit status > > According to the FAQ [2], I shouldn't even have to include -lkernel32. > > Can someone please tell me what I'm doing wrong? > > Thanks, > Andrew. > > [1] http://msdn.microsoft.com/en-us/library/aa373208(VS.85).aspx > [2] > http://www.cygwin.com/faq/faq.programming.html#faq.programming.win32-api > > Hi, There are a few possible causes. 1) You didn't include windows.h 2) You included it but didn't bump _WIN32_WINNT or equivalent. 3) The declaration is missing from winbase.h
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