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70 lines
2.2 KiB
Plaintext
70 lines
2.2 KiB
Plaintext
This is an alpha testing release of GNU Libtool.
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Please do not send any bug reports or questions about it to public
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forums (such as GNU newsgroups), send them directly to the libtool
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mailing list <bug-libtool@gnu.org>.
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global_symbol_pipe
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******************
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CALL FOR HELP: In order to implement dlopening even on archictectures
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that don't have shared libraries, I am collecting `NM' and
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`global_symbol_pipe' values for every known operating system.
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If ltconfig on your system says that it found the command to parse NM
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output, then you don't need to look any further:
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checking command to parse /usr/bin/nm output... yes
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Otherwise, I would very much appreciate hearing about the combination
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of `NM' and `global_symbol_pipe' that ltconfig needs to use in order
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to pass this test.
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`NM' is set by ltconfig to be an nm program that gives BSD-compatible
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symbol output, such as:
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$ nm assert-perr.o
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U _IO_stderr_
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00000000 T __assert_perror_fail
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U __assert_program_name
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U abort
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U fflush
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U fprintf
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U strerror
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If your OS's nm cannot produce output like this, that's still okay,
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but, for simplicity, I prefer using this kind of output.
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Then, global_symbol_pipe is a command that takes all exported symbols,
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including undefined ones, and produces a two-column list of them. The
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contents of the first column are the raw symbol name, and the second
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column contains the name needed to access the symbols from a C
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program.
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So, on most OSes, this will be a command like:
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$ nm assert-perr.o | \
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sed -e '/^.* [BCDEGRSTU] \([_A-Za-z][_A-Za-z0-9]*\)$/!d'
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-e 's/^.* [BCDEGRSTU] \([_A-Za-z][_A-Za-z0-9]*\)$/\1 \1/'
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_IO_stderr_ _IO_stderr_
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__assert_perror_fail __assert_perror_fail
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__assert_program_name __assert_program_name
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abort abort
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fflush fflush
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fprintf fprintf
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strerror strerror
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On some OSes, the C symbols will need to strip a leading underscore:
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$ nm assert-perr.o | \
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sed -e '/^.* [BCDEGRSTU] _\([_A-Za-z][_A-Za-z0-9]*\)$/!d'
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-e 's/^.* [BCDEGRSTU] _\([_A-Za-z][_A-Za-z0-9]*\)$/_\1 \1/'
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__IO_stderr_ _IO_stderr_
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___assert_perror_fail __assert_perror_fail
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___assert_program_name __assert_program_name
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_abort abort
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_fflush fflush
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_fprintf fprintf
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_strerror strerror
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