mirror of git://gcc.gnu.org/git/gcc.git
1b08ada61e
When gcc dwarf2out generates the .debug_line table itself (for example when generating one for a split DWARF .dwo) it uses natural sorting for the directory table. Shorter directory paths come before longer directory paths with the same prefix. This causes the files in the line table to pick the shorter dir. Creating slightly ineffecient line tables because the longer directory paths will never be used. Fix this by changing file_info_cmp () to pick longer directory prefixes before shorter ones. We still sort files (the compilation unit) without any directory path before all entries with a directory path, so they will still use dir entry 0 (the working directory). A hello.c program would get the following dir and line table before: Directory table: /opt/local/install/gcc/lib/gcc/x86_64-pc-linux-gnu/8.0.1/include /usr/include /usr/include/bits File name table: Entry Dir Time Size Name 1 0 0 0 hello.c 2 1 0 0 stddef.h 3 2 0 0 bits/types.h 4 2 0 0 libio.h 5 2 0 0 stdio.h 6 2 0 0 bits/sys_errlist.h Note that the last directory table entry is never used. After this patch it looks as follows: Directory table: /opt/local/install/gcc/lib/gcc/x86_64-pc-linux-gnu/8.0.1/include /usr/include/bits /usr/include File name table: Entry Dir Time Size Name 1 0 0 0 hello.c 2 1 0 0 stddef.h 3 2 0 0 types.h 4 3 0 0 libio.h 5 3 0 0 stdio.h 6 2 0 0 sys_errlist.h Which is similar to what gas would output. gcc/ChangeLog: * dwarf2out.c (file_info_cmp): Sort longer dir prefixes before shorter ones. From-SVN: r259655 |
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README
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