[llvm-bugs] [Bug 47347] New: After 6d485ff455ea, Assertion failed: (i < getNumParams() && "Illegal param #"), function getParamDecl, file clang/include/clang/AST/Decl.h, line 2430.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47347

            Bug ID: 47347
           Summary: After 6d485ff455ea, Assertion failed: (i <
                    getNumParams() && "Illegal param #"), function
                    getParamDecl, file clang/include/clang/AST/Decl.h,
                    line 2430.
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: dimitry at andric.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Bulding the FreeBSD graphics/pgplot results in an assertion:

./pgdispd/updatelgtitle.c:31:8: note: 'sprintf' is a builtin with type 'int
(char *, const char *, ...)'
Assertion failed: (i < getNumParams() && "Illegal param #"), function
getParamDecl, file
/usr/local/poudriere/jails/head-i386/usr/src/contrib/llvm-project/clang/include/clang/AST/Decl.h,
line 2430.
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the
crash backtrace, preprocessed source, and associated run script.
Stack dump:
0.      Program arguments: cc -O2 -pipe -fstack-protector-strong
-fno-strict-aliasing -I/usr/local/include -DPGDISP -c ./pgdispd/updatelgtitle.c
-o updatelgtitle.o 
1.      ./pgdispd/updatelgtitle.c:62:8: current parser token ')'
2.      ./pgdispd/updatelgtitle.c:21:1: parsing function body 'updatelgtitle'
3.      ./pgdispd/updatelgtitle.c:21:1: in compound statement ('{}')
4.      ./pgdispd/updatelgtitle.c:37:7: in compound statement ('{}')

Bisection shows this to be caused by https://reviews.llvm.org/D71566 /
https://reviews.llvm.org/rG6d485ff455ea ("Improve static checks for sprintf and
__builtin___sprintf_chk").

Minimized test case:

// clang -cc1 -triple x86_64-- -S updatelgtitle-min.c
int a;
char b;
double c, d;
void e() {
  void sprintf();
  sprintf(b, "line graphics #%d X %.6g Y %.6g", a, c, d);
}

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