postgres.git / summary / log / commit / refs

commit    f00c401c65afa2cf18f0d67d13eeb382df84c37b
Author:   Thomas Munro <tmunro@postgresql.org>
Date:     Wed Nov 27 02:43:18 2024 +0000
First released in: 13.19, 14.16, 15.11

    If a C23 compiler is detected, try asking for C17.
    
    Branches before 16 can't be compiled with a C23 compiler (see
    deprecation warnings silenced by commit f9a56e72, and non-back-patchable
    changes made in 16 by commit 1c27d16e).  Test __STDC_VERSION__, and if
    it's above C17 then try appending -std=gnu17.  The test is done with the
    user's CFLAGS, so an acceptable language version can also be configured
    manually that way.
    
    This is done in branches 15 and older, back to 9.2, per policy of
    keeping them buildable with modern tools.
    
    Discussion: https://postgr.es/m/87o72eo9iu.fsf%40gentoo.org


 configure    | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 configure.ac | 20 ++++++++++++++++
 2 files changed, 97 insertions(+)

diff --git a/configure b/configure
index fce7df1ac83..9c1e7bcccb0 100755
--- a/configure
+++ b/configure
@@ -5284,6 +5284,83 @@ else
   BITCODE_CXXFLAGS="-O2 $BITCODE_CXXFLAGS"
 fi
 
+# We use C constructs that became invalid in C23.  Check if the compiler
+# reports a standard higher than C17, with the flags selected above (so the
+# user can control the language level explicitly to avoid the gcc/clang-only
+# fallback logic below if preferred).
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $CC reports a C standard higher than ISO C17" >&5
+$as_echo_n "checking whether $CC reports a C standard higher than ISO C17... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+#if __STDC_VERSION__ > 201710L
+choke me
+#endif
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  POSTC17=no
+else
+  POSTC17=yes
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${POSTC17}" >&5
+$as_echo "${POSTC17}" >&6; }
+
+# If a too recent standard was detected with the user's CFLAGS, try asking for
+# C17 with GNU extensions explicitly.
+if test "$POSTC17" = yes; then
+  old_CFLAGS="$CFLAGS"
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} supports -std=gnu17, for CFLAGS" >&5
+$as_echo_n "checking whether ${CC} supports -std=gnu17, for CFLAGS... " >&6; }
+if ${pgac_cv_prog_CC_cflags__std_gnu17+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  pgac_save_CFLAGS=$CFLAGS
+pgac_save_CC=$CC
+CC=${CC}
+CFLAGS="${CFLAGS} -std=gnu17"
+ac_save_c_werror_flag=$ac_c_werror_flag
+ac_c_werror_flag=yes
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+int
+main ()
+{
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  pgac_cv_prog_CC_cflags__std_gnu17=yes
+else
+  pgac_cv_prog_CC_cflags__std_gnu17=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+ac_c_werror_flag=$ac_save_c_werror_flag
+CFLAGS="$pgac_save_CFLAGS"
+CC="$pgac_save_CC"
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_CC_cflags__std_gnu17" >&5
+$as_echo "$pgac_cv_prog_CC_cflags__std_gnu17" >&6; }
+if test x"$pgac_cv_prog_CC_cflags__std_gnu17" = x"yes"; then
+  CFLAGS="${CFLAGS} -std=gnu17"
+fi
+
+
+  if test "$CFLAGS" = "$old_CFLAGS"; then
+    as_fn_error $? "cannot proceed" "$LINENO" 5
+  fi
+fi
+
 # C[XX]FLAGS we determined above will be added back at the end
 user_CFLAGS=$CFLAGS
 CFLAGS=""
diff --git a/configure.ac b/configure.ac
index 00b91ab2c3e..78f819b262d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -459,6 +459,26 @@ else
   BITCODE_CXXFLAGS="-O2 $BITCODE_CXXFLAGS"
 fi
 
+# We use C constructs that became invalid in C23.  Check if the compiler
+# reports a standard higher than C17, with the flags selected above (so the
+# user can control the language level explicitly to avoid the gcc/clang-only
+# fallback logic below if preferred).
+AC_MSG_CHECKING([whether $CC reports a C standard higher than ISO C17])
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [@%:@if __STDC_VERSION__ > 201710L
+choke me
+@%:@endif])], [POSTC17=no], [POSTC17=yes])
+AC_MSG_RESULT(${POSTC17})
+
+# If a too recent standard was detected with the user's CFLAGS, try asking for
+# C17 with GNU extensions explicitly.
+if test "$POSTC17" = yes; then
+  old_CFLAGS="$CFLAGS"
+  PGAC_PROG_CC_CFLAGS_OPT([-std=gnu17])
+  if test "$CFLAGS" = "$old_CFLAGS"; then
+    AC_MSG_ERROR([cannot proceed])
+  fi
+fi
+
 # C[XX]FLAGS we determined above will be added back at the end
 user_CFLAGS=$CFLAGS
 CFLAGS=""


[parent: 88a16b3dbb16]