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Fix bogus fix-it for FLT_MAX (PR c/89122) 

PR c/89122 reports that we emit a bogus fix-it hint for the case where
the code uses FLT_MAX, but has included <limits.h> rather than <float.h>:

x.c:3:11: error: 'FLT_MAX' undeclared here (not in a function); did you
  mean 'INT_MAX'?
    3 | float f = FLT_MAX;
      |           ^~~~~~~
      |           INT_MAX

This patch adds some knowledge of <float.h> (and <cfloat>) to
known-headers.cc, fixing the issue:

x.c:3:11: error: 'FLT_MAX' undeclared here (not in a function)
    3 | float f = FLT_MAX;
      |           ^~~~~~~
x.c:2:1: note: 'FLT_MAX' is defined in header '<float.h>'; did you forget
  to '#include <float.h>'?
    1 | #include <limits.h>
  +++ |+#include <float.h>
    2 |

gcc/c-family/ChangeLog:
	PR c/89122
	* known-headers.cc (get_stdlib_header_for_name): Add
	{FLT|DBL|LDBL}_{MAX|MIN} to "hints" array.

gcc/testsuite/ChangeLog:
	PR c/89122
	* g++.dg/spellcheck-stdlib.C (test_FLT_MAX): New test.
	* gcc.dg/spellcheck-stdlib.c (test_FLT_MAX): New test.

From-SVN: r268426
This commit is contained in:
David Malcolm 2019-01-31 18:09:29 +00:00 committed by David Malcolm
parent 636ecb78a3
commit ec2be203d1
5 changed files with 30 additions and 0 deletions
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6
gcc/c-family/ChangeLog
View File

@ -1,3 +1,9 @@
2019-01-31 David Malcolm <dmalcolm@redhat.com>
PR c/89122
* known-headers.cc (get_stdlib_header_for_name): Add
{FLT|DBL|LDBL}_{MAX|MIN} to "hints" array.
2019-01-31 Jakub Jelinek <jakub@redhat.com>
PR libstdc++/88170

8
gcc/c-family/known-headers.cc
View File

@ -84,6 +84,14 @@ get_stdlib_header_for_name (const char *name, enum stdlib lib)
{"ULONG_MAX", {"<limits.h>", "<climits>"} },
{"USHRT_MAX", {"<limits.h>", "<climits>"} },
/* <float.h> and <cfloat>. */
{"DBL_MAX", {"<float.h>", "<cfloat>"} },
{"DBL_MIN", {"<float.h>", "<cfloat>"} },
{"FLT_MAX", {"<float.h>", "<cfloat>"} },
{"FLT_MIN", {"<float.h>", "<cfloat>"} },
{"LDBL_MAX", {"<float.h>", "<cfloat>"} },
{"LDBL_MIN", {"<float.h>", "<cfloat>"} },
/* <stdarg.h> and <cstdarg>. */
{"va_list", {"<stdarg.h>", "<cstdarg>"} },

6
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,9 @@
2019-01-31 David Malcolm <dmalcolm@redhat.com>
PR c/89122
* g++.dg/spellcheck-stdlib.C (test_FLT_MAX): New test.
* gcc.dg/spellcheck-stdlib.c (test_FLT_MAX): New test.
2019-01-31 Richard Biener <rguenther@suse.de>
PR tree-optimization/89135

5
gcc/testsuite/g++.dg/spellcheck-stdlib.C
View File

@ -77,6 +77,11 @@ int test_INT_MAX (void)
// { dg-message "'INT_MAX' is defined in header '<climits>'; did you forget to '#include <climits>'?" "" { target *-*-* } INT_MAX_line }
}
/* Missing <cfloat>. */
float test_FLT_MAX = FLT_MAX; // { dg-line FLT_MAX_line }
// { dg-error "'FLT_MAX' was not declared" "" { target *-*-* } FLT_MAX_line }
// { dg-message "'FLT_MAX' is defined in header '<cfloat>'; did you forget to '#include <cfloat>'?" "" { target *-*-* } FLT_MAX_line }
/* Missing <cstring>. */
void test_cstring (char *dest, char *src)

5
gcc/testsuite/gcc.dg/spellcheck-stdlib.c
View File

@ -62,3 +62,8 @@ int test_INT_MAX (void)
/* { dg-bogus "__INT_MAX__" "" { target *-*-* } INT_MAX_line } */
/* { dg-message "'INT_MAX' is defined in header '<limits.h>'; did you forget to '#include <limits.h>'?" "" { target *-*-* } INT_MAX_line } */
}
/* Missing <float.h>. */
float test_FLT_MAX = FLT_MAX; /* { dg-line FLT_MAX_line } */
/* { dg-error "'FLT_MAX' undeclared" "" { target *-*-* } FLT_MAX_line } */
/* { dg-message "'FLT_MAX' is defined in header '<float.h>'; did you forget to '#include <float.h>'?" "" { target *-*-* } FLT_MAX_line } */