sorry that I couldn't re-produce the warning as you said. micro# /import/dr3/s10/gcc-4.2/bin/gcc val-prof-1.c -fprofile-arcs -g -o val-prof-1.x1 micro# /import/dr3/s10/gcc-4.2/bin/gcc -v Using built-in specs. Target: sparc-sun-solaris2.10 Configured with: /import/dr2/starlex/1/gcc-4.2-20070228/configure --prefix=/import/dr3/s10/gcc-4.2 --enable-languages=c,c++,fortran --enable-rpath --with-mpfr=/import/dr3/s10/gcc-4.2 --with-gmp=/import/dr3/s10/gcc-4.2 Thread model: posix gcc version 4.2.0 20070228 (prerelease)
so is gcc-4.3 on the platform. 2008/5/7 Edmar Wienskoski-RA8797 <[EMAIL PROTECTED]>: > I said if you compile val-prof-1.c the same way bprob-1.c is compiled you > get an warning. > > > gcc -g -fprofile-arcs val-prof-1.c -o val-prof-1.x1 > > > > > Lijuan Hai wrote: > > > seen in gcc-4.2, gcc.misc-tests/bprob-1.c is compiled with > > -fprofile-arcs and -fbranch-probabilities. > > gcc.dg/tree-prof/val-prof-1.c is compiled with -fprofile-generate and > > -fprofile-use. so there won't be any warnings. > > > > 2008/4/25 Edmar Wienskoski-RA8797 <[EMAIL PROTECTED]>: > > > > > > > The test case gcc.misc/bprob-1.c is compiled with fprofile-arcs / > > > fprofile-use. > > > > > > The option fprofile-arcs does not enable value profiling. > > > > > > At the second stage compilation, the option fprofile-use enables value > > > profiling. Within tree_find_values_to_profile, if one of the value > > > optimizations algorithms sees an optimization opportunity, it will push > an > > > histogram on stack. Later, compute_value_histograms will call > > > get_coverage_counts to load this histogram, but none where generated. > > > > > > A warning is issued which means a FAIL under dejagnu. > > > > > > I found this problem with bprob-1.c while debugging a new value profile > > > optimization. But it can be reproduced in any target, with non-modified > gcc, > > > at any optimization level, using one of the value profile test cases and > > > compiler options fprofile-arcs / fprofile-use (same used with > bprob-1.c). > > > > > > Here is an example using gcc.dg/tree-prof/val-prof-1.c: > > > ./gcc-trunk-reference/install_e600/bin/gcc -g -fprofile-arcs > val-prof-1.c > > > -o val-prof-1.x1 > > > ./val-prof-1.x1 > > > ./gcc-trunk-reference/install_e600/bin/gcc -g -fprofile-use > val-prof-1.c -o > > > val-prof-1.x2 > > > val-prof-1.c: In function 'main': > > > val-prof-1.c:17: warning: no coverage for function 'main' found > > > > > > IMHO there are 3 ways to go with this: > > > 1 - Require user behavior change (create new option -fprofile-arcs-use > to > > > match -fprofile-arcs, mismatch of options is bad user behavior) > > > 2 - Record on the .gcda file how the first stage were done > (fprofile-arcs / > > > fprofile-generate, etc) and use it to disable other optimizations under > > > fprofile-use (Does this already exists ?, I am not familiar with the > .gcda > > > layout) > > > 3 - Let get_coverage_counts ignore inconsistencies when loading data. > > > > > > Helps / comments are appreciated. > > > > > > Edmar > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- Best wishes! Yours, Lijuan Hai _ _ (_)(_) (,,) =()= ((__)\ _|L\_______/
