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cembeddedmplabxc8

error: (1098) conflicting declarations for variable "_sprintf" in XC8

I want to append the length (integer) of a string message to another string using sprintf. But every time i get the above error. 

void ClientToServer(const char *client_msg)
{
    char str_len[20];
    int len = strlen(client_msg);
    char *ptr;
    sprintf(ptr,"AT+CIPSEND=0,%d",len);

}

Full error:

CLEAN SUCCESSFUL (total time: 77ms)
make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf
make[1]: Entering directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi'
make  -f nbproject/Makefile-default.mk dist/default/production/TokenOverWiFi.production.hex
make[2]: Entering directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi'
"C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokMain.p1 TokMain.c 
"C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokenTimer.p1 TokenTimer.c 
"C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokenWifi.p1 TokenWifi.c 
"C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/WifiCom.p1 WifiCom.c 
WifiCom.c:24:1: warning: (361) function declared implicit int
"C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -Wl,-Map=dist/default/production/TokenOverWiFi.production.map  -DXPRJ_default=default  -Wl,--defsym=__MPLAB_BUILD=1  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto      -Wl,--memorysummary,dist/default/production/memoryfile.xml -o dist/default/production/TokenOverWiFi.production.elf  build/default/production/TokMain.p1 build/default/production/TokenTimer.p1 build/default/production/TokenWifi.p1 build/default/production/WifiCom.p1     
C:\Program Files (x86)\Microchip\xc8\v2.10\pic\sources\c90\common\sprintf.c:13:: error: (1098) conflicting declarations for variable "_sprintf" (WifiCom.c:24)
(908) exit status = 1
make[2]: *** [dist/default/production/TokenOverWiFi.production.hex] Error 1
nbproject/Makefile-default.mk:186: recipe for target 'dist/default/production/TokenOverWiFi.production.hex' failed
make[2]: Leaving directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi'
nbproject/Makefile-default.mk:91: recipe for target '.build-conf' failed
make[1]: Leaving directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi'
nbproject/Makefile-impl.mk:39: recipe for target '.build-impl' failed
make[1]: *** [.build-conf] Error 2
make: *** [.build-impl] Error 2

BUILD FAILED (exit value 2, total time: 7s)

Edit: Warnings

The error vanished with couple of warnings when added stdio.h to the top of all header file. 

CLEAN SUCCESSFUL (total time: 49ms) make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf make[1]: Entering directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi' make  -f nbproject/Makefile-default.mk dist/default/production/TokenOverWiFi.production.hex make[2]: Entering directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi' "C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe" 
-mcpu=18F25K80 -c  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokMain.p1 TokMain.c  "C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c 
-fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokenTimer.p1 TokenTimer.c  "C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c 
-fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/TokenWifi.p1 TokenWifi.c  "C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80 -c 
-fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -DXPRJ_default=default  -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits   -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto     -o build/default/production/WifiCom.p1 WifiCom.c  "C:\Program Files (x86)\Microchip\xc8\v2.10\bin\xc8-cc.exe"  -mcpu=18F25K80
-Wl,-Map=dist/default/production/TokenOverWiFi.production.map  -DXPRJ_default=default  -Wl,--defsym=__MPLAB_BUILD=1  -fshort-double -fshort-float -memi=wordwrite -O1 -fasmfile -maddrqual=ignore -xassembler-with-cpp -mwarn=-3 -Wa,-a -msummary=-psect,-class,+mem,-hex,-file  -ginhx032 -Wl,--data-init -mno-keep-startup -mno-download -mdefault-config-bits -std=c90 -gdwarf-3 -mstack=compiled:auto:auto:auto      -Wl,--memorysummary,dist/default/production/memoryfile.xml -o dist/default/production/TokenOverWiFi.production.elf  build/default/production/TokMain.p1 build/default/production/TokenTimer.p1 build/default/production/TokenWifi.p1 build/default/production/WifiCom.p1      WifiCom.c:25:: warning: (1257) local variable "_ptr" is used but never given a value C:\Program Files (x86)\Microchip\xc8\v2.10\pic\sources\c90\common\doprnt.c:558:: warning: (1498) pointer (sprintf@sp) in expression may have no targets C:\Program Files (x86)\Microchip\xc8\v2.10\pic\sources\c90\common\doprnt.c:1465:: warning: (1498) pointer (sprintf@sp) in expression may have no targets C:\Program Files (x86)\Microchip\xc8\v2.10\pic\sources\c90\common\doprnt.c:1550:: warning: (1498) pointer (sprintf@sp) in expression may have no targets C:\Program Files (x86)\Microchip\xc8\v2.10\pic\sources\c90\common\doprnt.c:1564:: warning: (1498) pointer (sprintf@sp) in expression may have no targets ::: warning: (1311) missing configuration setting for config word 0x300003; using default

Memory Summary:
    Program space        used   89Ah (  2202) of  8000h bytes   (  6.7%)
    Data space           used   229h (   553) of   E41h bytes   ( 15.2%)
    Configuration bits   used     7h (     7) of     7h words   (100.0%)
    EEPROM space         used     0h (     0) of   400h bytes   (  0.0%)
    ID Location space    used     8h (     8) of     8h bytes   (100.0%)
    Data stack space     used     0h (     0) of   B41h bytes   (  0.0%)

make[2]: Leaving directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi' make[1]: Leaving directory 'C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi'

BUILD SUCCESSFUL (total time: 9s) Loading code from C:/Users/acer kuttan/Documents/pk/pk/TokenOverWiFi/dist/default/production/TokenOverWiFi.production.hex... Loading completed
Solution

  • You are printing a string onto a pointer that is neither initialized or has allocated memory in the heap. From the looks of your logs, it would seem you're writing the program to an embedded system of some sort which probably doesn't have any memory protection via Virtual Memory and if it does, it is probably throwing a segmentation fault.

    Declare ptr as a character array of an arbitrary size. Given, your format string, I would say 30 would be sufficient but, you can set it to be higher if required

    void ClientToServer(const char *client_msg)
{
    int len = strlen(client_msg);
    char ptr[30];
    sprintf(ptr,"AT+CIPSEND=0,%d",len);

}

    In your code, ptr is probably possessing some random value and it is writing your value to some address on your system, which may not even be mapped to your instruction/data memory (especially, NULL). I have also removed the str_len array which doesn't seem to be serving any purpose.