1.??????今天遇到一問題，在sles11/vxworks下編譯通過，但是在hpux下失敗

2.??????編譯錯誤：

/usr/ccs/bin/ld:DP relative code in file /projects/xxx/DERIVED/tfa_pa32-hpux.a(tfa02_pa32-hpux.o) -shared library must be position

??? independent.? Use +z or +Z to recompile.

3.????修改makefile，添加+z選項

ifeq($(BLD_TARGET_ARCH),pa32-hpux)

TS_LOGLIB_OPTS.o+= +z

endif

4.????重新編譯

5.????報新的錯誤如下：

/usr/ccs/bin/ld:Data Linkage Table (+z) overflow in file /projects/xxx/loglib_pa32-hpux-mt.a(a7ts_log_pa32-hpux-mt.o)- use +Z option to recompile

?? Reference from:? /projects/xxx/loglib_pa32-hpux-mt.a(a7ts_log_pa32-hpux-mt.o)(0x604)

6.????查詢+z 和 +Z 的區別，如下：

+z,+Z Both ofthese options cause the compiler to generate?position independent code(PIC) for use in building?shared libraries. +Z is the default in 64-bitmode.?The -G and -p options are ignored if +z or +Z is used.?Normally,+z should be used to generate PIC; however,?when certain limits areexceeded, +Z is required to?generate PIC. The ld linker issues theerror?indicating when +Z is required. If both +z and +Z are?
specified, only the last one encountered applies. For?a more completediscussion regarding PIC and these?
options, see HP-UX Linker and Libraries Online User's?Guide and the manualProgramming on HP-UX.??

7.??????修改makefile，添加+Z選項：

ifeq($(BLD_TARGET_ARCH),pa32-hpux)

TS_LOGLIB_OPTS.o+= +Z

endif

8.????編譯通過。

9.????結論：

9.1??+z/+Z 相當于gcc 中的-fPIC；

(The '+Z' refers to *compiler* flag for HP cc/CC, which isequivalent to '-fPIC' for gcc.)

9.2??+z +Z有區別；

9.3??這個選項是編譯(compile)選項,而不是鏈接(ld)選項；

總結

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