Ancient versions of gcc, such as the gcc 4.1.2 in RHEL 5.5, don't
support some -W flags that newer versions do. Fix up configure.ac
and Makefile.am to use them if you have them.
Signed-off-by: Jim Schutt <jaschut@xxxxxxxxxx>
---
configure.ac | 21 +++++++++++++++++++++
src/Makefile.am | 2 +-
2 files changed, 22 insertions(+), 1 deletions(-)
diff --git a/configure.ac b/configure.ac
index 5642717..dc4d710 100644
--- a/configure.ac
+++ b/configure.ac
@@ -33,6 +33,27 @@ AC_PROG_CXX
AC_PROG_MAKE_SET
AC_PROG_LIBTOOL
+# Checks for compiler warning types
+
+# AC_CHECK_CC_FLAG(FLAG_TO_TEST, VARIABLE_TO_SET_IF_SUPPORTED)
+# ---------
+AC_DEFUN([AC_CHECK_CC_FLAG],
+[{
+ AC_LANG_PUSH([C])
+ my_cflags_save="$CFLAGS"
+ CFLAGS="$my_cflags_save $1"
+ AC_MSG_CHECKING([whether $CC accepts $1])
+ AC_COMPILE_IFELSE(AC_LANG_PROGRAM(),
+ [AC_MSG_RESULT([yes]); AC_SUBST([$2], ["$1"])],
+ [AC_MSG_RESULT([no])]
+ )
+ CFLAGS="$my_cflags_save"
+ AC_LANG_POP([C])
+}])
+
+AC_CHECK_CC_FLAG([-Wtype-limits], [WARN_TYPE_LIMITS])
+AC_CHECK_CC_FLAG([-Wignored-qualifiers], [WARN_IGNORED_QUALIFIERS])
+
# Checks for libraries.
AC_CHECK_LIB([m], [pow], [true], AC_MSG_FAILURE([libm not found]))
AC_CHECK_LIB([pthread], [pthread_create], [true], AC_MSG_FAILURE([libpthread not found]))
diff --git a/src/Makefile.am b/src/Makefile.am
index 3113111..071360e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -479,7 +479,7 @@ CLEANFILES += \
##
AM_COMMON_FLAGS = -Wall -D__CEPH__ -D_FILE_OFFSET_BITS=64 -D_REENTRANT -D_THREAD_SAFE -rdynamic \
--Wtype-limits -Wignored-qualifiers -Winit-self -Wpointer-arith \
+${WARN_TYPE_LIMITS} ${WARN_IGNORED_QUALIFIERS} -Winit-self -Wpointer-arith \
-fno-strict-aliasing
AM_CFLAGS = $(AM_COMMON_FLAGS)
--
1.6.6
--
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