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Fixed errors in Nim Backend integration docs. (#20046)

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Fixed errors in Nim Backend integration.
Section "Nim invocation example from C"
NimMain needs a declaration and function declarations have external
linkage by default.
Also with the order of arguments to gcc with a static lib,
maths.c needs to come before the static lib.
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Don-Duong Quach 2022-07-17 00:32:33 -07:00 • committed by GitHub
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doc/backends.md
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@ -270,7 +270,8 @@ Create a ``maths.c`` file with the following content:
#include <stdio.h> #include <stdio.h>
extern int fib(int a); int fib(int a);
void NimMain();
int main(void) int main(void)
{ {
@ -302,7 +303,7 @@ also ask the Nim compiler to generate a statically linked library:
.. code:: cmd .. code:: cmd
nim c --app:staticLib --noMain fib.nim nim c --app:staticLib --noMain fib.nim
gcc -o m -Inimcache -Ipath/to/nim/lib libfib.nim.a maths.c gcc -o m -Inimcache -Ipath/to/nim/lib maths.c libfib.nim.a
The Nim compiler will handle linking the source files generated in the The Nim compiler will handle linking the source files generated in the
``nimcache`` directory into the ``libfib.nim.a`` static library, which you can ``nimcache`` directory into the ``libfib.nim.a`` static library, which you can