[ECOS] linker error

[ECOS] linker error

[Trenton D. Adams]

I'm attempting to compile my program.  I'm getting the error below.  For
some reason the linker is not finding my function.  If I switch it to a
'c' extension it works fine, but cpp will not work.  Is there any way to
make it work with a cpp extension?  I have the reverse happening on my
windows side.  I need these functions on both platforms.

I tried doing the following, but it gave me a compiler error on the
windows side.  I was sure that extern "C" was what I was supposed to do.
extern "C" function prototype

This may seem like a dumb question, but I'm not very up to speed on
different linkages since I've never had to worry about it because I
always do windows development in MFC.  Even my MSDN documentation says
that extern "C" is supposed to work.  It doesn't though.

Hope fully there's something I can do to fix it on the gcc side of
things.

arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c AcquireThread.c -Ttarget.ld
-nostdlib -o AcquireThread.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c CommandThread.c -Ttarget.ld
-nostdlib -o CommandThread.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c StatusSignalThread.c
-Ttarget.ld -nostdlib -o StatusSignalThread.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c TransmitThread.c
-Ttarget.ld -nostdlib -o TransmitThread.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c NetCode.c -Ttarget.ld
-nostdlib -o NetCode.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS           -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/in
clude -ffunction-sections -fdata-sections -c
../../WindowsDevelopment/Monitor/netproto.cpp \
-Ttarget.ld -nostdlib -o netproto.o
arm-elf-gcc -O0 -mcpu=arm7tdmi -D__EDB7211 -D__ECOS
-nostartfiles -L/c/MyDocuments/eCosBuilds/RAMSupport_insta
ll/lib -Wl,--gc-sections -g -Wall
-I/c/MyDocuments/eCosBuilds/RAMSupport_install/include
-ffunction-sections -fdata-sect
ions AcquireThread.o CommandThread.o \
        StatusSignalThread.o TransmitThread.o NetCode.o netproto.o \
        RigSystem.c -Ttarget.ld -nostdlib -o RigSystem.exe
CommandThread.o: In function `CommandThread':
/c/MyDocuments/eCosDevelopment/RigSystem/CommandThread.c:113: undefined
reference to `ToTRigCommand'
/c/MyDocuments/eCosDevelopment/RigSystem/CommandThread.c:167: undefined
reference to `ToTRigCommand'
collect2: ld returned 1 exit status
make: *** [rigsystem] Error 1


Trenton D. Adams
Extreme Engineering
#17, 6025 - 12 St. SE
Calgary, Alberta, Canada
T2H 2K1

Phone: 403 640 9494 ext-208
Fax: 403 640 9599

http://www.extremeeng.com

Re: [ECOS] linker error

[Jonathan Larmour]

"Trenton D. Adams" wrote:
> 
> I'm attempting to compile my program.  I'm getting the error below.  For
> some reason the linker is not finding my function.  If I switch it to a
> 'c' extension it works fine, but cpp will not work.  Is there any way to
> make it work with a cpp extension?  I have the reverse happening on my
> windows side.  I need these functions on both platforms.
> 
> I tried doing the following, but it gave me a compiler error on the
> windows side.  I was sure that extern "C" was what I was supposed to do.
> extern "C" function prototype

Looks right to me I'm afraid, and that's certainly what normally works
elsewhere. You can see whether it's working by doing an "arm-elf-nm" of the
.o file and seeing how if the name has changed to the C++ "mangled" name. 

Jifl
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