Make configure check for a C compiler

[people/ms/network.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index f3dd33b4d13182e5b1125fc947b861eecb6c2cf1..1e01c5fe7dedd15849a1c0cc783f2306e03443ce 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -52,6 +52,42 @@ PKG_PROG_PKG_CONFIG
 # This makes sure pkg.m4 is available.
 m4_pattern_forbid([^_?PKG_[A-Z_]+$],[*** pkg.m4 missing, please install pkg-config])
 
+# C Compiler
+AC_PROG_CC
+AC_PROG_CC_C99
+AC_PROG_CC_C_O
+AC_PROG_GCC_TRADITIONAL
+
+CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
+       -pipe \
+       -Wall \
+       -Wextra \
+       -Wno-inline \
+       -Wundef \
+       "-Wformat=2 -Wformat-security -Wformat-nonliteral" \
+       -Wno-unused-parameter \
+       -Wno-unused-result \
+       -fno-strict-aliasing \
+       -ffunction-sections \
+       -fdata-sections \
+       -fstack-protector-all \
+       --param=ssp-buffer-size=4])
+AC_SUBST([OUR_CFLAGS], $with_cflags)
+
+AS_CASE([$CFLAGS], [*-O[[12345g\ ]]*],
+       [CC_CHECK_FLAGS_APPEND([with_cppflags], [CPPFLAGS], [\
+               -Wp,-D_FORTIFY_SOURCE=2])],
+       [AC_MSG_RESULT([skipping -D_FORTIFY_SOURCE, optimization not enabled])])
+AC_SUBST([OUR_CPPFLAGS], $with_cppflags)
+
+CC_CHECK_FLAGS_APPEND([with_ldflags], [LDFLAGS], [\
+       -Wl,--as-needed \
+       -Wl,--no-undefined \
+       -Wl,--gc-sections \
+       -Wl,-z,relro \
+       -Wl,-z,now])
+AC_SUBST([OUR_LDFLAGS], $with_ldflags)
+
 # ------------------------------------------------------------------------------
 AC_ARG_WITH([systemdsystemunitdir],
        AS_HELP_STRING([--with-systemdsystemunitdir=DIR], [Directory for systemd service files]),
@@ -75,6 +111,10 @@ AC_OUTPUT
 AC_MSG_RESULT([
        $PACKAGE_NAME $VERSION
 
+       CFLAGS:               ${OUR_CFLAGS} ${CFLAGS}
+       CPPFLAGS:             ${OUR_CPPFLAGS} ${CPPFLAGS}
+       LDFLAGS:              ${OUR_LDFLAGS} ${LDFLAGS}
+
        prefix:               $prefix
 
        systemdsystemunitdir: $systemdsystemunitdir