This is an exercise I did\u00a0\u00a0 today. I\u00a0 am documenting it for my own reference.<\/p>\n
The problem was simple.<\/p>\n
Create a library with functions.<\/p>\n
add(int,int) and sub (int,int)<\/p>\n
and then use the library\u00a0 in another program.<\/p>\n
Here is the code<\/p>\n
\/*add.c*\/<\/p>\n
#include “a.h”<\/p>\n
int add( int a,int b)<\/p>\n
{
\nreturn (a+b);
\n}
\nint sub (int a, int b)
\n{
\nreturn( a-b);
\n}<\/p>\n
Here is the header<\/p>\n
\/* a.h*\/<\/p>\n
int add(int,int);
\nint sub(int,int);<\/p>\n
Compile add.c to get add.o<\/p>\n
gcc -c<\/a> add.c \r\n<\/pre>\nYou will have an object file add.o .<\/p>\n
Now\u00a0 create a static library\u00a0 with<\/p>\n
ar rcs\u00a0 libadd.a add.o<\/p>\n
If you have a program which uses functions from your new library as below<\/p>\n
\/*\u00a0 main.c *\/<\/p>\n
#include “a.h”
\nint main()
\n{
\nprintf (“%d\\n”, add(5,10));
\nprintf (“%d\\n”, sub(10,5));
\nreturn 0;
\n}
\nYou can link against\u00a0 our new\u00a0 library\u00a0 like this.<\/p>\ngcc -o main main.c -L. -ladd<\/p>\n
( Note the -L. and -ladd. -L. say that look for library in current directory and -ladd says that the name of the library is libadd.a)<\/p>\n
For creating dynamic libraries, first compile the file containing library as below.<\/p>\n
gcc -c<\/a> -fPIC<\/a> add.c\r\n\r\nand\r\n\r\n ld -shared -soname libadd.so.1 -o libadd.so.1.0 -lc add.o\r\n\r\n ln -sf libadd.so.1 libadd.so<\/pre>\n\/sbin\/ldconfig -v -n .<\/p>\n
( Dont forget .)<\/p>\n
Now you are ready to use the library<\/p>\n
gcc -o main\u00a0 main.c -L. -ladd<\/p>\n","protected":false},"excerpt":{"rendered":"
This is an exercise I did\u00a0\u00a0 today. I\u00a0 am documenting it for my own reference. The problem was simple. Create a library with functions. add(int,int) and sub (int,int) and then use the library\u00a0 in another program. Here is the code \/*add.c*\/ #include “a.h” int add( int a,int b) { return (a+b); } int sub (int… Continue reading How to create static and dynamic libraries with gcc<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/249"}],"collection":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=249"}],"version-history":[{"count":0,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/249\/revisions"}],"wp:attachment":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}