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add compiler warnings checks from LibreSSL

OPENBSD_5_9
Brent Cook 8 years ago
parent
commit
373f8c75cb
2 changed files with 31 additions and 0 deletions
  1. +2
    -0
      configure.ac
  2. +29
    -0
      m4/disable-compiler-warnings.m4

+ 2
- 0
configure.ac View File

@ -32,6 +32,8 @@ AC_PROG_LIBTOOL
LT_INIT LT_INIT
AC_PROG_YACC AC_PROG_YACC
DISABLE_COMPILER_WARNINGS
CHECK_OS_OPTIONS CHECK_OS_OPTIONS
CHECK_CRYPTO_COMPAT CHECK_CRYPTO_COMPAT


+ 29
- 0
m4/disable-compiler-warnings.m4 View File

@ -0,0 +1,29 @@
AC_DEFUN([DISABLE_COMPILER_WARNINGS], [
# Clang throws a lot of warnings when it does not understand a flag. Disable
# this warning for now so other warnings are visible.
AC_MSG_CHECKING([if compiling with clang])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [[
#ifndef __clang__
not clang
#endif
]])],
[CLANG=yes],
[CLANG=no]
)
AC_MSG_RESULT([$CLANG])
AS_IF([test "x$CLANG" = "xyes"], [CLANG_FLAGS=-Qunused-arguments])
CFLAGS="$CFLAGS $CLANG_FLAGS"
LDFLAGS="$LDFLAGS $CLANG_FLAGS"
# Removing the dependency on -Wno-pointer-sign should be a goal. These are
# largely unsigned char */char* mismatches in asn1 functions.
save_cflags="$CFLAGS"
CFLAGS=-Wno-pointer-sign
AC_MSG_CHECKING([whether CC supports -Wno-pointer-sign])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])],
[AC_MSG_RESULT([yes])]
[AM_CFLAGS=-Wno-pointer-sign],
[AC_MSG_RESULT([no])]
)
CFLAGS="$save_cflags $AM_CFLAGS"
])

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