Hello,
I have wrote a pretty simple code and try to build it as SO, but it always
failed.
1) Write a cpp code call function imgLoader::Singleton which is defined in xul
(imgLoader.cpp).
2) Write a moz.build file with following key contents.
XPCOMBinaryComponent('testSO')
USE_LIBS += [
'mozalloc',
'xul',
]
3) Compile it in firefox.
I got following error:
17:23.11 Executing: c++ -Wall -Wempty-body -Woverloaded-virtual -Wsign-compare
-Wwrite-strings -Wno-invalid-offsetof -Wcast-align -fno-exceptions
-fno-strict-aliasing -fno-rtti -fno-exceptions -fno-math-errno -std=gnu++0x
-pthread -pipe -DNDEBUG -DTRIMMED -g -freorder-blocks -Os -fomit-frame-pointer
-fPIC -shared -Wl,-z,defs -Wl,-h,libtestConfig.so -o libtestConfig.so
/home/samuelyang/build_ff/firefox_dev/obj-x86_64-unknown-linux-gnu/zlh_first_com/tmp2MgbrM.list
-lpthread -Wl,-z,noexecstack -Wl,-z,text -Wl,--build-id
-Wl,-rpath-link,/home/samuelyang/build_ff/firefox_dev/obj-x86_64-unknown-linux-gnu/dist/bin
-Wl,-rpath-link,/usr/local/lib ../xpcom/glue/libxpcomglue_s.a
../memory/mozalloc/libmozalloc.so ../nsprpub/lib/ds/libplds4.so
../nsprpub/lib/libc/src/libplc4.so ../nsprpub/pr/src/libnspr4.so
../toolkit/library/libxul.so -Wl,--version-script
-Wl,/home/samuelyang/build_ff/firefox_dev/build/unix/gnu-ld-scripts/components-version-script
-Wl,-Bsymbolic -ldl
17:23.11
/home/samuelyang/build_ff/firefox_dev/obj-x86_64-unknown-linux-gnu/zlh_first_com/tmp2MgbrM.list:
17:23.11 INPUT("Unified_cpp_zlh_first_com0.o")
17:23.11 INPUT("../memory/fallible/fallible.o")
17:23.11
17:23.11 Unified_cpp_zlh_first_com0.o: In function `testConfig::testConfig()':
17:23.11 /home/samuelyang/build_ff/firefox_dev/zlh_first_com/testConfig.cpp:17:
undefined reference to `curl_easy_init'
17:23.11 /home/samuelyang/build_ff/firefox_dev/zlh_first_com/testConfig.cpp:22:
undefined reference to `imgLoader::Singleton()'
What I tried but still couldn't make it success.
1.) Comment AC_SUBST(VISIBILITY_FLAGS) in configure.in
2) I also tried to add . #pragma GCC visibility push(default) in both
imgLoader.h and imgLoader.cpp.
3) Disable gold by adding ac_add_options --disable-gold into .mozconfig.
I have checked the libxul.so, it did contains the symbol.
samuelyang@firefox-dev:~/build_ff/firefox_dev/obj-x86_64-unknown-linux-gnu/zlh_first_com$
nm ../toolkit/library/libxul.so | grep imgLoader | grep Single
0000000001085062 t _ZN9imgLoader11PBSingletonEv
000000000108503a t _ZN9imgLoader9SingletonEv
Do you guys know what is wrong? Or how can I build a single SO with xul
references?
Millions of thanks.
Sam
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