g++ cannot find library although it’s there

  antlr4, c++, g++, ld

I’m compiling some cpp files with:

$ ​g++ -c --std=c++17 -I/antlr4/runtime/Cpp/runtime/src/ *.cpp

And everything goes fine:

$ ls -l *.cpp *.o
-rw-r--r-- 1 root root   76637 Dec  1 14:33 Java8Lexer.cpp
-rw-r--r-- 1 root root  370768 Dec  1 15:13 Java8Lexer.o
-rw-r--r-- 1 root root  925012 Dec  1 14:33 Java8Parser.cpp
-rw-r--r-- 1 root root 5037896 Dec  1 15:13 Java8Parser.o
-rw-r--r-- 1 root root     113 Dec  1 14:33 Java8ParserBaseListener.cpp
-rw-r--r-- 1 root root    2312 Dec  1 15:13 Java8ParserBaseListener.o
-rw-r--r-- 1 root root     109 Dec  1 14:33 Java8ParserListener.cpp
-rw-r--r-- 1 root root    2304 Dec  1 15:13 Java8ParserListener.o
-rw-r--r-- 1 root root     724 Dec  1 14:36 main.cpp
-rw-r--r-- 1 root root  324360 Dec  1 15:13 main.o

When I try to link with a library, it fails:

$ g++ *.o -l/antlr4/runtime/Cpp/dist/libantlr4-runtime.so.4.9.3
/usr/bin/ld: cannot find -l/antlr4/runtime/Cpp/dist/libantlr4-runtime.so.4.9.3
collect2: error: ld returned 1 exit status

This is weird because the shared library does exist:

$ ls -l /antlr4/runtime/Cpp/dist/libantlr4-runtime.so.4.9.3
-rwxr-xr-x 1 root root 1599624 Dec  1 14:28 /antlr4/runtime/Cpp/dist/libantlr4-runtime.so.4.9.3

Source: Windows Questions C++

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