Currently gcc suggests to use _Bool instead of bool and doesn't give
any suggestions when true or false are used, but undefined. This patch
makes it so that (for C99 or higher) a fixit hint is emitted to include
<stdbool.h>.
gcc/c-family/ChangeLog:
* known-headers.cc (get_stdlib_header_for_name): Return
"<stdbool.h> for "bool", "true" or "false" when STDLIB_C and
flag_isoc99.
gcc/testsuite/ChangeLog:
* gcc.dg/spellcheck-stdbool.c: New test.
---
gcc/c-family/known-headers.cc | 8 ++++++++
gcc/testsuite/gcc.dg/spellcheck-stdbool.c | 17 +++++++++++++++++
2 files changed, 25 insertions(+)
create mode 100644 gcc/testsuite/gcc.dg/spellcheck-stdbool.c
diff --git a/gcc/c-family/known-headers.cc b/gcc/c-family/known-headers.cc
index a21166860c0f..183ce2834afd 100644
--- a/gcc/c-family/known-headers.cc
+++ b/gcc/c-family/known-headers.cc
@@ -158,6 +158,14 @@ get_stdlib_header_for_name (const char *name, enum stdlib
lib)
for (size_t i = 0; i < num_hints; i++)
if (strcmp (name, hints[i].name) == 0)
return hints[i].header[lib];
+
+ /* Only for C99 and higher. */
+ if (lib == STDLIB_C && flag_isoc99)
+ if (strcmp (name, "bool") == 0
+ || strcmp (name, "true") == 0
+ || strcmp (name, "false") == 0)
+ return "<stdbool.h>";
+
return NULL;
}
diff --git a/gcc/testsuite/gcc.dg/spellcheck-stdbool.c
b/gcc/testsuite/gcc.dg/spellcheck-stdbool.c
new file mode 100644
index 000000000000..01f12da35cfe
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/spellcheck-stdbool.c
@@ -0,0 +1,17 @@
+/* { dg-options "-std=c99" } */
+/* Missing <stdbool.h>. */
+
+bool b; /* { dg-error "unknown type name 'bool'" } */
+/* { dg-message "'bool' is defined in header '<stdbool.h>'; did you forget to
'#include <stdbool.h>'?" "" { target *-*-* } .-1 } */
+
+int test_true (void)
+{
+ return true; /* { dg-error "'true' undeclared" } */
+ /* { dg-message "'true' is defined in header '<stdbool.h>'; did you forget
to '#include <stdbool.h>'?" "" { target *-*-* } .-1 } */
+}
+
+int test_false (void)
+{
+ return false; /* { dg-error "'false' undeclared" } */
+ /* { dg-message "'false' is defined in header '<stdbool.h>'; did you forget
to '#include <stdbool.h>'?" "" { target *-*-* } .-1 } */
+}
--
2.20.1
