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Enable more GCC warnings

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This enables the following additional warnings:
-Wold-style-definition
-Warray-bounds=2 instead of the default 1
-Wformat=2, but only for GCC 4.8+ as Wno-format-nonliteral is not
 respected for older versions
-Wunused-const-variable, which enables level 2 instead of the default 1
-Warray-bounds also in debug mode through -ftree-vrp
-Wnull-dereference also in debug mode through
 -fdelete-null-pointer-checks

Closes https://github.com/curl/curl/pull/2747
This commit is contained in:
Marcel Raad 2018-07-07 09:00:29 +02:00
parent 15ed9f87e3
commit 014ed7c22f
No known key found for this signature in database
GPG Key ID: 33C416EFAE4D6F02
1 changed files with 15 additions and 1 deletions
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16
m4/curl-compilers.m4
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@ -1012,6 +1012,7 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
dnl Only gcc 3.4 or later
if test "$compiler_num" -ge "304"; then
tmp_CFLAGS="$tmp_CFLAGS -Wdeclaration-after-statement"
tmp_CFLAGS="$tmp_CFLAGS -Wold-style-definition"
fi
#
dnl Only gcc 4.0 or later
@ -1030,6 +1031,8 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
tmp_CFLAGS="$tmp_CFLAGS -Wmissing-parameter-type -Wempty-body"
tmp_CFLAGS="$tmp_CFLAGS -Wclobbered -Wignored-qualifiers"
tmp_CFLAGS="$tmp_CFLAGS -Wconversion -Wno-sign-conversion -Wvla"
dnl required for -Warray-bounds, included in -Wall
tmp_CFLAGS="$tmp_CFLAGS -ftree-vrp"
fi
#
dnl Only gcc 4.5 or later
@ -1045,12 +1048,23 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
tmp_CFLAGS="$tmp_CFLAGS -Wdouble-promotion"
fi
#
dnl only gcc 4.8 or later
if test "$compiler_num" -ge "408"; then
tmp_CFLAGS="$tmp_CFLAGS -Wformat=2"
fi
#
dnl Only gcc 5 or later
if test "$compiler_num" -ge "500"; then
tmp_CFLAGS="$tmp_CFLAGS -Warray-bounds=2"
fi
#
dnl Only gcc 6 or later
if test "$compiler_num" -ge "600"; then
tmp_CFLAGS="$tmp_CFLAGS -Wshift-negative-value"
tmp_CFLAGS="$tmp_CFLAGS -Wshift-overflow=2"
tmp_CFLAGS="$tmp_CFLAGS -Wnull-dereference"
tmp_CFLAGS="$tmp_CFLAGS -Wnull-dereference -fdelete-null-pointer-checks"
tmp_CFLAGS="$tmp_CFLAGS -Wduplicated-cond"
tmp_CFLAGS="$tmp_CFLAGS -Wunused-const-variable"
fi
#
dnl Only gcc 7 or later