Hi, On Thu, Sep 27, 2018 at 4:31 PM, Tapas Mishra wrote: > Hi, > I am trying to do a project when I do a make on project code > in cygwin environment I get following error > > gcc -Wall -g -c main.c -o main.o > main.c: In function ‘main’: > main.c:50:8: warning: unused variable ‘physmem’ [-Wunused-variable] > char *physmem = page_table_get_physmem(pt); > ^~~~~~~ > gcc -Wall -g -c page_table.c -o page_table.o > page_table.c: In function ‘page_table_set_entry’: > page_table.c:125:2: warning: implicit declaration of function > ‘remap_file_pages’ [-Wimplicit-function-declaration] > remap_file_pages(pt->virtmem+page*PAGE_SIZE,PAGE_SIZE,0,frame,0); > ^~~~~~~~~~~~~~~~ > gcc -Wall -g -c disk.c -o disk.o > gcc -Wall -g -c program.c -o program.o > gcc main.o page_table.o disk.o program.o -o virtmem > page_table.o: In function `page_table_set_entry': > /home/DEEL/cs602/try1/page_table.c:125: undefined reference to > `remap_file_pages' > /home/DEEL/cs602/try1/page_table.c:125:(.text+0x491): relocation > truncated to fit: R_X86_64_PC32 against undefined symbol > `remap_file_pages' > collect2: error: ld returned 1 exit status > make: *** [makefile:2: virtmem] Error 1 > > I compiled the same code on a linux instance hosted on amazon cloud > and it compiled successfully. So this brought me to a conclusion some > files are missing in cygwin and hence I reached here.
remap_file_pages is a Linux system call: http://man7.org/linux/man-pages/man2/remap_file_pages.2.html It is not implemented on Cygwin. Csaba -- You can get very substantial performance improvements by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler So if you're looking for a completely portable, 100% standards-conformat way to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK) -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
