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build: Add compiler warnings support

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Detect as many warnings as possible during configure and enable them
if the user did not supply any, so that any such problem can be spotted
and fixed.
This commit is contained in:
Guillem Jover
2021-02-19 06:55:17 +01:00
parent 8f59221c4f
commit 4f68a88f55
4 changed files with 65 additions and 4 deletions
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24
m4/libbsd-compiler.m4 Normal file
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@@ -0,0 +1,24 @@
# Copyright © 2021 Guillem Jover <guillem@hadrons.org>
# LIBBSD_CHECK_COMPILER_FLAG
# -------------------------
AC_DEFUN([LIBBSD_CHECK_COMPILER_FLAG], [
AS_VAR_PUSHDEF([libbsd_varname_cache], [libbsd_cv_cflags_$1])
AC_CACHE_CHECK([whether $CC accepts $1], [libbsd_varname_cache], [
m4_define([libbsd_check_flag], m4_bpatsubst([$1], [^-Wno-], [-W]))
AS_VAR_COPY([libbsd_save_CFLAGS], [CFLAGS])
AS_VAR_SET([CFLAGS], ["-Werror libbsd_check_flag"])
AC_COMPILE_IFELSE([
AC_LANG_SOURCE([[]])
], [
AS_VAR_SET([libbsd_varname_cache], [yes])
], [
AS_VAR_SET([libbsd_varname_cache], [no])
])
AS_VAR_COPY([CFLAGS], [libbsd_save_CFLAGS])
])
AS_VAR_IF([libbsd_varname_cache], [yes], [
AS_VAR_APPEND([LIBBSD_COMPILER_FLAGS], [" $1"])
])
AS_VAR_POPDEF([libbsd_varname_cache])
])