[cfe-dev] unclear about how to correctly run scan-build through make

[Peeter Joot]

If I run scan-build on one file manually I get a report directory created
as expected:

# cat t.C
int * foo(){ int x ; return &x ;}

# scan-build -o $HOME/scan-build --use-analyzer=`which clang` clang++ t.C -c
scan-build: Using '/home/peeterj/clang/optimized/bin/clang' for static
analysis
t.C:1:30: warning: address of stack memory associated with local variable
'x' returned [-Wreturn-stack-address]
int * foo(){ int x ; return &x ;}
                             ^
1 warning generated.
t.C:1:22: warning: Address of stack memory associated with local variable
'x' returned to caller
int * foo(){ int x ; return &x ;}
             ~~~~~   ^      ~~
1 warning generated.
scan-build: 1 bugs found.
scan-build: Run 'scan-view /home/peeterj/scan-build/2012-12-12-3' to
examine bug reports.

However, if I run this using a make rule, I see scan-build invoke make, but
get the "contains no reports" message:

# rm *.o
# cat makefile
t.o : t.C
        clang++ t.C -c
# scan-build -o $HOME/scan-build --use-analyzer=`which clang` make
scan-build: Using '/home/peeterj/clang/optimized/bin/clang' for static
analysis
clang++ t.C -c
t.C:1:30: warning: address of stack memory associated with local variable
'x' returned [-Wreturn-stack-address]
int * foo(){ int x ; return &x ;}
                             ^
1 warning generated.
scan-build: Removing directory '/home/peeterj/scan-build/2012-12-12-4'
because it contains no reports.

>From the scan-build man page, it appears that this is how to use this
utility, but doing so just results in make being called as is.  In what way
is the makefile for the project supposed to be modified to use scan-build?

-- 
Peeter
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