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curl-compilers.m4: enable double-promotion warning

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Enable -Wdouble-promotion for both GCC and clang. It warns on implicit
promotion from float to double.

Closes https://github.com/curl/curl/pull/1578
This commit is contained in:
Marcel Raad 2017-06-16 14:06:23 +02:00
parent 783ce023a5
commit b5c5909f30
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1 changed files with 10 additions and 0 deletions
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10
m4/curl-compilers.m4
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@ -891,6 +891,11 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
if test "$compiler_num" -ge "209"; then
tmp_CFLAGS="$tmp_CFLAGS -Wshift-sign-overflow"
fi
#
dnl Only clang 3.6 or later
if test "$compiler_num" -ge "306"; then
tmp_CFLAGS="$tmp_CFLAGS -Wdouble-promotion"
fi
fi
;;
#
@ -1002,6 +1007,11 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
fi
fi
#
dnl Only gcc 4.6 or later
if test "$compiler_num" -ge "406"; then
tmp_CFLAGS="$tmp_CFLAGS -Wdouble-promotion"
fi
#
fi
#
dnl Do not issue warnings for code in system include paths.