如何正確引用GNU readline庫來掃描終端輸入？

Question

我試圖編譯在GNU readline中使用以下內容的C代碼。

#include <readline/readline.h>; 
#include <readline/history.h>; 

我試圖改變<>到「」兩者有和沒有-lreadline選項編譯。似乎沒有任何工作。

Reading specs from /software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/specs 
Configured with: ../gcc-3.4.6/configure --prefix=/software/gcc-3.4.6-0/pkg --disable-dependency-tracking --localstatedir=/var --disable-nls --program-suffix=34 --enable-shared --enable-version-specific-runtime-libs 
Thread model: posix 
gcc version 3.4.6 
/software/gcc-3.4.6-0/pkg/libexec/gcc/i386-unknown-freebsd6.1/3.4.6/cc1 -quiet -v myshell.c -quiet -dumpbase myshell.c -auxbase myshell -version -o /var/tmp//ccVSq3jQ.s 
ignoring nonexistent directory "/software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/../../../../i386-unknown-freebsd6.1/include" 
#include "..." search starts here: 
#include <...> search starts here: 
/usr/local/include 
/software/gcc-3.4.6-0/pkg/include 
/software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/include 
/usr/include 
End of search list. 
GNU C version 3.4.6 (i386-unknown-freebsd6.1) 
     compiled by GNU C version 3.4.6. 
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=129976 
as -o /var/tmp//ccl1Jaqk.o /var/tmp//ccVSq3jQ.s 
/software/gcc-3.4.6-0/pkg/libexec/gcc/i386-unknown-freebsd6.1/3.4.6/collect2 -V -dynamic-linker /libexec/ld-elf.so.1 -L/software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1 -o a /usr/lib/crt1.o /usr/lib/crti.o /software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/crtbegin.o -L/software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6 -L/software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/../../.. /var/tmp//ccl1Jaqk.o -lreadline -lgcc -lgcc_eh -lc -lgcc -lgcc_eh /software/gcc-3.4.6-0/pkg/lib/gcc/i386-unknown-freebsd6.1/3.4.6/crtend.o /usr/lib/crtn.o 
/usr/bin/ld: cannot find -lreadline 
GNU ld version 2.15 [FreeBSD] 2004-05-23 
    Supported emulations: 
    elf_i386_fbsd 
collect2: ld returned 1 exit status 

這是輸出而不-lreadline選項編譯時：當沒有-lreadline下GCC編譯編譯時（詳細）產生結果在下面。

/var/tmp//ccNnucSC.o(.text+0x4f): In function `main': 
: undefined reference to `readline' 
collect2: ld returned 1 exit status 

到目前爲止，我一直無法解決此錯誤。我在代碼或調用gcc時缺少什麼？

Answer 1

在UNIX下編譯我發現下面是要正確引用GNU的readline庫：

gcc code.c -L/usr/local/lib -I/usr/local/include -lreadline 

這確保了編譯器發現編譯期間的readline目錄和文件和鏈接。

Answer 2

這聽起來像你沒有安裝libreadline開發庫。在Debian上（包括FreeBSD的端口），這個庫位於/ lib，開發庫（你會鏈接到）位於/ usr/lib目錄下。

此外，你包含後，你有分號，你不應該有。