1、./configure時出現以下錯誤：C compiler cannot create executables

[[email protected] pcre-8.39]# ./configure 
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking whether make supports nested variables... (cached) yes
checking for style of include used by make... GNU
checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in `/opt/software/pcre-8.39':
configure: error: C compiler cannot create executables
See `config.log' for more details
 

2、於是檢視config.log檔案，發現開始報錯處：/usr/bin/ld: cannot find -lgcc_s

gcc: no input files
configure:3809: $? = 1
configure:3829: checking whether the C compiler works
configure:3851: gcc    conftest.c  >&5
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.4.7/libgcc_s.so when searching for -lgcc_s
/usr/bin/ld: skipping incompatible /usr/lib/gcc/x86_64-redhat-linux/4.4.7/libgcc_s.so when searching for -lgcc_s
/usr/bin/ld: cannot find -lgcc_s
collect2: ld returned 1 exit status
configure:3855: $? = 1
configure:3893: result: no
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "PCRE"
| #define PACKAGE_TARNAME "pcre"
| #define PACKAGE_VERSION "8.39"
| #define PACKAGE_STRING "PCRE 8.39"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL ""
| #define PACKAGE "pcre"
| #define VERSION "8.39"
| /* end confdefs.h.  */
| 
| int
| main ()
| {
| 
|   ;
|   return 0;
| }
configure:3898: error: in `/opt/software/pcre-8.39':
configure:3900: error: C compiler cannot create executables
See `config.log' for more details
 

3、再上網找了找cannot find -lgcc_s這個錯誤，才知道是系統找不到需要連結的庫檔案（該庫檔案為libgcc_s.so）

  find / -name libgcc_s.so進行檔案查詢，發現gcc下有這個檔案

[[email protected] pcre-8.39]# find / -name libgcc_s.so
/opt/oracle/app/oracle/product/11.2.0/dbhome_1/lib/stubs/libgcc_s.so
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/libgcc_s.so
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/32/libgcc_s.so
 

但是vi編輯這個檔案才知道，是個空檔案，即libgcc_s.so是一個連結檔案，需要連結到對應目錄的libgcc_s.so.1檔案

於是find / -name libgcc_s.so1，在/usr/lib64/libgcc_s.so.1下（64位機）

[[email protected] pcre-8.39]# find / -name libgcc_s.so.1
/opt/oracle/app/oracle/product/11.2.0/dbhome_1/lib/stubs/libgcc_s.so.1
/root/libgcc_s.so.1
/lib/libgcc_s.so.1
/usr/lib/vmware-tools/lib32/libgcc_s.so.1
/usr/lib/vmware-tools/lib32/libgcc_s.so.1/libgcc_s.so.1
/usr/lib/vmware-tools/lib64/libgcc_s.so.1
/usr/lib/vmware-tools/lib64/libgcc_s.so.1/libgcc_s.so.1
/usr/lib64/libgcc_s.so.1
/lib64/libgcc_s.so.1 

知道問題了，那就好說了，新增libgcc_s.so連結

ln -sf /usr/lib64/libgcc_s.so.1  /usr/lib/gcc/x86_64-redhat-linux/4.4.7/libgcc_s.so

好了，再次./configure下，剛才的錯誤沒有了，問題解決

pcre-8.39 configuration summary:

    Install prefix .................. : /usr/local
    C preprocessor .................. : gcc -E
    C compiler ...................... : gcc
    C++ preprocessor ................ : g++ -E
    C++ compiler .................... : g++
    Linker .......................... : /usr/bin/ld -m elf_x86_64
    C preprocessor flags ............ : 
    C compiler flags ................ : -g -O2 -fvisibility=hidden
    C++ compiler flags .............. : -O2 -fvisibility=hidden -fvisibility-inlines-hidden
    Linker flags .................... : 
    Extra libraries ................. : 

    Build 8 bit pcre library ........ : yes
    Build 16 bit pcre library ....... : no
    Build 32 bit pcre library ....... : no
    Build C++ library ............... : yes
    Enable JIT compiling support .... : no
    Enable UTF-8/16/32 support ...... : no
    Unicode properties .............. : no
    Newline char/sequence ........... : lf
    \R matches only ANYCRLF ......... : no
    EBCDIC coding ................... : no
    EBCDIC code for NL .............. : n/a
    Rebuild char tables ............. : no
    Use stack recursion ............. : yes
    POSIX mem threshold ............. : 10
    Internal link size .............. : 2
    Nested parentheses limit ........ : 250
    Match limit ..................... : 10000000
    Match limit recursion ........... : MATCH_LIMIT
    Build shared libs ............... : yes
    Build static libs ............... : yes
    Use JIT in pcregrep ............. : no
    Buffer size for pcregrep ........ : 20480
    Link pcregrep with libz ......... : no
    Link pcregrep with libbz2 ....... : no
    Link pcretest with libedit ...... : no
    Link pcretest with libreadline .. : no
    Valgrind support ................ : no
    Code coverage ................... : no