Android MuPDF 阅读器设置

Question

我需要在片段中显示PDF文档，经过一些在线研究，我遇到了MuPDF阅读器，这是最受欢迎的开源阅读器，我按照此链接中的所有步骤进行操作 http://mupdf.blogspot.in/。当我尝试按照上面的博客使用以下命令通过 Cyqwin 编译这个 MuPDF 库时

**Open Cygwin console,(just double click cygwin installation short-cut) and type following command and enter.
cd /cygdrive/<path to mupdf sorce folder/android ex. cd /cygdrive/c/mupdf-1.0-    source/android
/cygdrive/<path to ndk installation>/ndk-build ex. /cygdrive/c/ndk/ndk-build**

我收到以下错误

**Compile thumb  : mupdfcore <= draw_path.c
Compile thumb  : mupdfcore <= draw_simple_scale.c
C:cygwin64tmpccEtywkX.s: Assembler messages:
C:cygwin64tmpccEtywkX.s:2248: Error: lo register required -- `str fp,[sp,#-4]!'
C:cygwin64tmpccEtywkX.s:2253: Error: lo register required -- `add fp,sp,#0'
C:cygwin64tmpccEtywkX.s:2257: Error: lo register required -- `str r0,[fp,#-16]'
C:cygwin64tmpccEtywkX.s:2258: Error: lo register required -- `str r1,[fp,#-20]'
C:cygwin64tmpccEtywkX.s:2259: Error: lo register required -- `str r2,[fp,#-24]'
C:cygwin64tmpccEtywkX.s:2260: Error: lo register required -- `str r3,[fp,#-28]'
C:cygwin64tmpccEtywkX.s:2262: Error: lo register required -- `ldr r3,[fp,#-24]'
C:cygwin64tmpccEtywkX.s:2263: Error: lo register required -- `str r3,[fp,#-8]'
C:cygwin64tmpccEtywkX.s:2267: Error: lo register required -- `ldr r3,[fp,#-16]'
C:cygwin64tmpccEtywkX.s:2269: Error: lo register required -- `str r2,[fp,#-16]'
C:cygwin64tmpccEtywkX.s:2270: Error: lo register required -- `ldr r2,[fp,#-20]'
C:cygwin64tmpccEtywkX.s:2272: Error: lo register required -- `str r1,[fp,#-20]'
C:cygwin64tmpccEtywkX.s:2276: Error: lo register required -- `ldr r3,[fp,#-8]'
C:cygwin64tmpccEtywkX.s:2278: Error: lo register required -- `str r3,[fp,#-8]'
C:cygwin64tmpccEtywkX.s:2281: Error: lo register required -- `ldr r3,[fp,#-8]'
C:cygwin64tmpccEtywkX.s:2285: Error: lo register required -- `ldr r3,[fp,#-28]'
C:cygwin64tmpccEtywkX.s:2286: Error: lo register required -- `ldr r2,[fp,#4]'
C:cygwin64tmpccEtywkX.s:2289: Error: lo register required -- `ldr r2,[fp,#-24]'
C:cygwin64tmpccEtywkX.s:2291: Error: lo register required -- `str r3,[fp,#-8]'
...
at the end this long operation terminates with the following ...
C:cygwin64tmpccEtywkX.s:4057: Error: lo register required -- `ldr r3,[fp,#-104]'
C:cygwin64tmpccEtywkX.s:4061: Error: lo register required -- `sub sp,fp,#8'
C:cygwin64tmpccEtywkX.s:4063: Error: lo register required -- `ldmfd sp!,{r4,fp,pc}'
/cygdrive/d/Sajay/Software/android-ndk-r9/build/core/build-binary.mk:345: recipe for target 'obj/local/armeabi/objs-debug/mupdfcore/__/__/draw/draw_simple_scale.o' failed
make: *** [obj/local/armeabi/objs-debug/mupdfcore/__/__/draw/draw_simple_scale.o] Error 1**

在线尝试解决此问题后，我遇到了以下堆栈溢出问题，这与我的问题非常相似

http://stackoverflow.com/questions/15050042/error-while-building-mupdf-1-1-on-mac

我下载了NDK 8b并尝试编译，但仍然以较短的形式收到类似的错误

Compile   : mupdf <= mupdf.c
/bin/sh: /cygdrive/d/user/Software/android-ndk-r8b-windows/android-ndk-r8b/toolchains/arm-linux-androideabi-4.8/prebuilt/windows/bin/arm-linux-androideabi-gcc: No such file or directory
/cygdrive/d/user/Software/android-ndk-r8b-windows/android-ndk-r8b/build/core/build-binary.mk:252: recipe for target 'obj/local/armeabi/objs-debug/mupdf/mupdf.o' failed
make: *** [obj/local/armeabi/objs-debug/mupdf/mupdf.o] Error 127

任何帮助将不胜感激。

提前谢谢。

Answer 1

我刚刚解决了这样的问题！我使用 gcc 在我的项目中编译了一个 xxx.S 文件，它抛出了这样的错误

"../src/__sys.S：20：错误：需要 lo 寄存器 -- 'stmdb r0！，{r4-r11}'"

而这个

"../src/__sys.S：20：错误：Thumb-2 指令仅在统一语法中有效 -- 'stmdb r0！，{r4}'"

---

我从这个维基中找到了一个解决方案https://wiki.ubuntu.com/ARM/Thumb2PortingHowto#Types_of_Assembly_Language

并通过在我的 xxx.S 文件的开头添加此行来解决我的问题

.syntax unified

希望这对你有用！